Search

Your search keyword '"S. Kartik"' showing total 62 results
Start Over Author "S. Kartik" Search Limiters Full Text
62 results on '"S. Kartik"'

1. Function Identification in Neuron Populations via Information Bottleneck

Author

S. Kartik Buddha, Kelvin So, Jose M. Carmena, and Michael C. Gastpar

Subjects
information theory, information bottleneck method, neuroscience, Science, Astrophysics, QB460-466, Physics, QC1-999
Abstract

It is plausible to hypothesize that the spiking responses of certain neurons represent functions of the spiking signals of other neurons. A natural ensuing question concerns how to use experimental data to infer what kind of a function is being computed. Model-based approaches typically require assumptions on how information is represented. By contrast, information measures are sensitive only to relative behavior: information is unchanged by applying arbitrary invertible transformations to the involved random variables. This paper develops an approach based on the information bottleneck method that attempts to find such functional relationships in a neuron population. Specifically, the information bottleneck method is used to provide appropriate compact representations which can then be parsed to infer functional relationships. In the present paper, the parsing step is specialized to the case of remapped-linear functions. The approach is validated on artificial data and then applied to recordings from the motor cortex of a macaque monkey performing an arm-reaching task. Functional relationships are identified and shown to exhibit some degree of persistence across multiple trials of the same experiment.

Published
2013
Full Text
View/download PDF

2. Impact of HRCT pattern on six-minute walk test in patients with interstitial lung disease—An observational study

Author

Puneet Saxena, Itishree Singh, Abhishek Kumar, S Kartik, Virender Malik, Saurabh Tiwari, K R Akhil, Somali Pattanayak, Vaibhavi G Velangi, and Harsh Jain

Subjects
exercise test, forced vital capacity, interstitial lung disease, six-minute walk test, usual interstitial pneumonia, Diseases of the respiratory system, RC705-779
Abstract

Background: Forced vital capacity (FVC) and six-minute walk distance (6MWD) are robust markers in interstitial lung diseases (ILD) to assess severity and prognosis. It is unknown whether high-resolution computed tomography pattern has any independent effect on the exercise capacity in ILD. We compared six-minute walk test (6MWT) parameters between usual interstitial pneumonia (UIP) and non-UIP ILD after adjusting for FVC. Methods: Data from a tertiary care ILD clinic were retrospectively analysed. Based on HRCT, patients were classified as UIP and non-UIP. 6MWT parameters and FVC were recorded for enrolled patients. 6MWD, distance-saturation product (DSP) and exertional desaturation were compared between UIP and non-UIP, using analysis of covariance (ANCOVA), with per cent predicted FVC as covariate. Patients were grouped as mild (≥70%), moderate (51%–69%) and severe (≤50%) based on FVC severity. Results: Out of 169 patients enrolled, only patients with all three data points: spirometry, 6MWT and HRCT were included in the analysis (n = 139). UIP group comprised 56 (40.3%), while non-UIP group had 83 (59.7%) patients. More females and lesser smokers were present in non-UIP group. Mean predicted FVC% was similar between the two HRCT groups (P = 0.611) and had a statistically significant, though very weak to weak correlation with 6MWT parameters {6MWD (r = 0.138); pred 6MWD% (r = 0.170); desaturation (r = -0.227); DSP index (r = 0.166)}. Analysis of covariance showed no statistically significant difference in the 6MWT parameters between UIP and non-UIP groups for similar FVC levels. Conclusion: For a similar level of lung function, exercise capacity was similar for patients with UIP and non-UIP pattern ILD.

Published
2023
Full Text
View/download PDF

3. Blau syndrome: A case report of a rare granulomatous disorder

Author

Preema Sinha, S Kartik, Jasvinder Kaur Bhatia, and Thrinley Choden

Subjects
blau syndrome, granulomatous dermatitis, polyarthritis, uveitis, Dermatology, RL1-803, Pediatrics, RJ1-570
Abstract

Blau syndrome is a rare condition characterized by the triad of granulomatous skin lesions, symmetric polyarthritis with boggy joint swellings, and ocular inflammation. It has an autosomal dominant mode of inheritance and occurs due to a mutation in CARD-15/NOD-2 gene which encodes the cytosolic NOD2 protein, a key molecule in the regulation of innate immunity. Clinical onset is generally in the 1st year of life and is characterized by articular, cutaneous, and ocular noncaseating granulomatous inflammation, which can be variably associated with a heterogeneous systemic spectrum. Here, we describe one such rare case.

Published
2020
Full Text
View/download PDF

5. Kinetic modelling for thermal decomposition of agricultural residues at different heating rates

Author

S. Kartik, Ali Abbas, Abhishek Sharma, Anand G. Chakinala, Jyeshtharaj B. Joshi, Thomas J. Rainey, and Hemant Kumar Balsora

Subjects
Thermogravimetric analysis, Order of reaction, Materials science, Renewable Energy, Sustainability and the Environment, 020209 energy, Chemical process of decomposition, Thermal decomposition, Kinetics, Analytical chemistry, 02 engineering and technology, Activation energy, 010501 environmental sciences, Atmospheric temperature range, 01 natural sciences, 0202 electrical engineering, electronic engineering, information engineering, Pyrolysis, 0105 earth and related environmental sciences
Abstract

The purpose of this work was to establish the pyrolysis kinetics of agricultural biomass residues (mustard husk (MH), cotton stalk (CS), and groundnut shell (GNS)) using thermogravimetric analysis (TGA). TGA is carried out at different heating rates (5, 10, 30, and 50 K/min) under inert conditions in the temperature range of 303–1173 K. The iso-conversional methods of Friedman, Kissinger-Akahira-Sunose, and Flynn-Wall-Ozawa were used to estimate the activation energy of the decomposition process. The Criado method, Coats-Redfern Method, and Direct Differential methods were used to model the kinetics, with the latter two methods providing a closer fit with the experimental data. The kinetics of thermal degradation were separately studied for three temperature zones represented as drying, active, and passive zones. The results of Coats-Redfern and Direct Differential methods showed that (i) the nth-order reaction model is applicable for all the samples with order of reaction in the active zone being around ~ 2.0–3.0, ~ 2.5–3.0, and ~ 3.0 for MH, CS, and GNS, respectively, and (ii) the D-3 model is applicable for all the samples in the passive zone.

Published
2021

6. Distributed Activation Energy Model for Thermal Decomposition of Polypropylene Waste

Author

S. Kartik, Mukesh Goel, Abhishek Sharma, Abhishek Asthana, Jyeshtharaj B. Joshi, Hemant Kumar Balsora, and Anand G. Chakinala

Subjects
Polypropylene, Thermogravimetric analysis, chemistry.chemical_compound, Materials science, chemistry, Thermal decomposition, Thermodynamics, Activation energy, Fuel oil, Valorisation, Pyrolysis, Decomposition
Abstract

Thermal decomposition kinetics of Polypropylene (PP) waste is extremely important with respect to valorisation of waste plastics and production of utilizable components viz. chemicals, fuel oil & gas. The present research study focuses on pyrolysis kinetics of PP waste, which is present as a fraction of municipal plastic waste through distributed activation energy model (DAEM). The decomposition kinetics for PP follows a Gaussian distribution, where the normal distribution curves were centred corresponding to activation energy of 224 kJ/mol. The standard deviation of the distribution for the PP sample was found to be 22 kJ/mol indicating its wider distribution of decomposition range. The data validation has been carried out by comparing the rate parameter and extent of conversion values calculated through DAEM model with the Thermogravimetric analysis (TGA) experiments carried out for PP at various heating rates of 5, 10, 20 and 40 °C/min.

Published
2021

7. Comparative effectuality of two pre-procedural mouthwashes during debonding - a clinical study

Author

Shamshad Begum, Faisal Arshad, G. S. Kartik Swamy, H. C. Kumar, and NK Lokesh

Subjects
Clinical study, Aerosols, lcsh:RK1-715, business.industry, chlorhexidine gluconate, lcsh:Dentistry, Dentistry, Medicine, hydrogen peroxide, business, colony forming units, preprocedural rinse
Abstract

Background and Objectives: The aerosols produced by air turbine handpiece during debonding procedures have a high potential risk factor for the spread of infectious agents. Mostly, dental procedures that involve the use of mechanical instrumentation will produce airborne particulate from the operating site. Airotors being commonly used to remove adhesive materials after debonding procedure are known to produce the most visible aerosols. Hence, the objective of the present study was to evaluate the effectiveness of hydrogen peroxide and chlorhexidine gluconate mouthwash on the amount of aerosol generation during debonding procedure. Materials and Methods: A split mouth design was followed in this study to allow each patient to serve as his or her own control. The study included 20 patients, randomly assigned into two groups, chlorhexidine and hydrogen peroxide. Blood agar plates were annexed to the face shields, and dental chair table which were used for collecting the aerosol samples following the removal of braces with bracket-removing pliers, the excess adhesive material left on the teeth was removed on the left side of the patient's mouth with a tungsten carbide bur on a handpiece. Then, the patient rinsed his/her mouth with mouthwash (undiluted) for 1 min, and the same clinical procedure was performed for the other side of the mouth, the plates were covered and color coded. The agar plates were sent for aerobic and anaerobic culture. Results: The results revealed that the use of high-speed air turbines with coolant during the removal of adhesive material significantly increases the amount of aerosol contamination in and around the operatory area. There was a reduction of aerobic and anaerobic colony forming units (CFUs) in both the groups, i.e., CHX (48.72%) and hydrogen peroxide (54.40%). Although hydrogen peroxide showed more CFU reductions in both aerobic and anaerobic colonies. Conclusion: In percentage reduction of CFUs, hydrogen peroxide Group showed more reduction than chlorhexidine Group.

Published
2018

8. One-year clinical outcome of patients with nonvalvular atrial fibrillation: Insights from KERALA-AF registry

Author

Bahuleyan, C.G., primary, Namboodiri, Narayanan, additional, Jabir, A., additional, Lip, Gregory Y.H., additional, Koshy A, George, additional, Shifas, Babu M., additional, Viswanathan S, Kartik, additional, Zachariah, Geevar, additional, Venugopal, K., additional, Punnose, Eapen, additional, Natarajan, K.U., additional, Mini, G.K., additional, Joseph, Johny, additional, Nambiar C, Ashokan, additional, Jayagopal, P.B., additional, Mohanan, P.P., additional, George, Raju, additional, Unni, Govindan, additional, Sajeev, C.G., additional, Muhammed, Shaffi, additional, Syam, N., additional, Roby, Anil, additional, Daniel, Rachel, additional, Krishnakumar, V.V., additional, Pillai, Anand M., additional, Joseph, Stigi, additional, and Jinbert Lordson, A., additional

Published
2021
Full Text
View/download PDF

10. High-resolution esophageal manometry in systemic sclerosis in the indian population: An observational study

Author

Dharmendra Kumar, Gaurav Sikri, S Kartik, A B Srinivasa, Binit Kumar, and Deepanjan Dey

Subjects
medicine.medical_specialty, esophageal motility disorder, lcsh:Diseases of the musculoskeletal system, systemic sclerosis, business.industry, lower esophageal sphincter, Achalasia, Disease, medicine.disease, Gastroenterology, Basal (phylogenetics), high-resolution manometry, medicine.anatomical_structure, Rheumatology, Esophageal motility disorder, Internal medicine, Inclusion and exclusion criteria, medicine, Observational study, lcsh:RC925-935, Esophagus, business, High resolution manometry
Abstract

Background: Systemic sclerosis (SSc) is a rare multisystemic autoimmune disorder in which the esophagus is the second most common organ to be affected after the skin, leading to dysmotility. Literature available on esophageal dysmotility in SSc is limited. Moreover, studies explaining the spectrum of esophageal dysmotility in the disease in the Indian population are sparse. Aim: The aim of this study was to characterize esophageal motility disorders in SSc using esophageal high-resolution manometry (HRM) in a representative of the Southwestern Indian population. Methods: Thirty-two SSc patients participated in the study. All of them met the inclusion and exclusion criteria and underwent esophageal HRM at the Gastrointestinal Physiology Laboratory, Department of Physiology, of our center. The findings were interpreted using the Chicago Classification v3.0 criteria. Results: Among patients of SSc with a mean age of 42.25 ± 10.45 years, 19 (59.38%) had “absent contractility (AC),” 3 (9.38%) had “ineffective esophageal motility (IEM),” 3 (9.38%) had “type I achalasia, 1 (3.13%) had “esophagogastric junction outflow obstruction,” and 6 (18.75%) had “normal” HRM findings. The HRM parameter of “basal lower esophageal sphincter pressure” differed significantly between “IEM type I achalasia” (P = 0.043) and “type I achalasia AC” groups (P = 0.032), while “median integral relaxation pressure” of “type I achalasia” groups showed significant difference with “normal, IEM, and AC” groups each (P < 0.001). Conclusions: The findings of the study suggest that varying degrees of esophageal motility disorders are present in SSc using HRM as defined by the Chicago Classification v3.0. Majority (59.38%) of patients had AC, but the rest of them showed other dysmotility patterns.

Published
2020

11. EXTRACTION OF THE GLUON DENSITY OF THE PROTON AT X

Author

M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R.L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, G. Geitz, M. Grothe, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H.-P. Jakob, U.F. Katz, S.M. Mari, A. Mass, S. Mengel, J. Mollen, E. Paul, Ch. Rembser, R. Schattevoy, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, N. Dyce, B. Foster, S. George, R. Gilmore, G.P. Heath, H.F. Heath, T.J. Llewellyn, C.J.S. Morgado, D.J.P. Norman, J.A. O'Mara, R.J. Tapper, S.S. Wilson, R. Yoshida, R.R. Rau, M. Arneodo, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Eskreys, K. Jelén, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, T. Kȩdzierski, A. Kotański, M. Przybycień, L.A.T. Bauerdick, U. Behrens, J.K. Bienlein, S. Böttcher, C. Coldewey, G. Drews, M. Flasiński, D.J. Gilkinson, P. Göttlicher, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heβling, H. Hultschig, Y. Iga, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, W. Kröger, J. Krüger, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, O. Mańczak, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, T. Voβ, D. Westphal, G. Wolf, C. Youngman, H.J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, S. Qian, L. Votano, A. Bamberger, A. Freidhof, T. Poser, S. Söldner-Rembold, J. Schroeder, G. Theisen, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, I. Fleck, V.A. Jamieson, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, H. Kammerlocher, B. Krebs, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, A. Fürtjes, L. Hagge, E. Lohrmann, J. Mainusch, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, J. Terron, F. Zetsche, T.C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V.L. Harris, B.H. Hung, K.R. Long, D.B. Miller, P.P.O. Morawitz, A. Prinias, J.K. Sedgbeer, A.F. Whitfield, U. Mallik, E. McCliment, M.Z. Wang, S.M. Wang, J.T. Wu, Y. Zhang, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.W. Nam, S.K. Park, M.H. Suh, S.H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, J. del Peso, J. Puga, J.F. de Trocóniz, F. Ikraiam, J.K. Mayer, G.R. Smith, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, L.E. Sinclair, D.G. Stairs, M. St.Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Y.A. Golubkov, V.D. Kobrin, V.A. Kuzmin, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, S. Bentvelsen, M. Botje, F. Chlebana, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, V. O'Dell, A. Tenner, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, W.N. Murray, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, G.A. Blair, A. Byrne, R.J. Cashmore, A.M. Cooper-Sarkar, D. Daniels, R.C.E. Devenish, N. Harnew, M. Lancaster, P.E. Luffman, L. Lindemann, J. McFall, C. Nath, A. Quadt, H. Uijterwaal, R. Walczak, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, M. Iori, G. Marini, M. Mattioli, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, E. Barberis, N. Cartiglia, T. Dubbs, C. Heusch, M. Van Hook, B. Hubbard, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, J. Biltzinger, R.J. Seifert, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, S. Nagayama, Y. Nakamitsu, R. Cirio, M. Costa, M.I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, M.B. Crombie, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, C.R. Sampson, R.J. Teuscher, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, K. Blankenship, J. Kochocki, B. Lu, L.W. Mo, W. Bogusz, K. Charchuł, a, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Zarnecki, M. Adamus, Y. Eisenberg, C. Glasman, U. Karshon, D. Revel, A. Shapira, I. Ali, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, T. Tsurugai, S. Bhadra, W.R. Frisken, and K.M. Furutani

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, Nuclear physics, INELASTIC MUON SCATTERING, DEUTERON STRUCTURE FUNCTIONS, ZEUS, NUCLEON STRUCTURE FUNCTIONS, HIGH STATISTICS MEASUREMENT, PARTON DISTRIBUTIONS, LEADING ORDER, HIGH Q2, PERTURBATION-THEORY, SCALING VIOLATIONS, PP COLLISIONS, Quantum chromodynamics, Physics, ZEUS (particle detector), Neutral current, Scattering, High Energy Physics::Phenomenology, HERA, Gluon, High Energy Physics::Experiment, Perturbation theory (quantum mechanics)
Abstract

The gluon momentum density xg ( x , Q 2 ) of the proton was extracted at Q 2 = 20 GeV 2 for small values of x between 4 × 10 −4 and 10 −2 from the scaling violations of the proton structure function F 2 measured recently by ZEUS in deep inelastic neutral current ep scattering at HERA. The extraction was performed in two ways. Firstly, using a global NLO fit to the ZEUS data on F 2 at low x constrained by measurementsfrom NMC at larger x ; and secondly using published approximate methods for the solution of the GLAP QCD evolution equations. Consistent results are obtained. A substantial increase of the gluon density is found at small x in comparison with the NMC result obtained at larger values of x .

Published
2016

12. Function Identification in Neuron Populations via Information Bottleneck

Author

Jose M. Carmena, Kelvin So, S. Kartik Buddha, and Michael Gastpar

Subjects
information bottleneck method, Computer science, Population, General Physics and Astronomy, lcsh:Astrophysics, Information theory, computer.software_genre, Machine learning, neuroscience, 03 medical and health sciences, 0302 clinical medicine, lcsh:QB460-466, lcsh:Science, education, information theory, 030304 developmental biology, 0303 health sciences, education.field_of_study, Parsing, Quantitative Biology::Neurons and Cognition, business.industry, Contrast (statistics), Information bottleneck method, Function (mathematics), lcsh:QC1-999, Identification (information), lcsh:Q, Artificial intelligence, business, computer, Random variable, lcsh:Physics, 030217 neurology & neurosurgery
Abstract

It is plausible to hypothesize that the spiking responses of certain neurons represent functions of the spiking signals of other neurons. A natural ensuing question concerns how to use experimental data to infer what kind of a function is being computed. Model-based approaches typically require assumptions on how information is represented. By contrast, information measures are sensitive only to relative behavior: information is unchanged by applying arbitrary invertible transformations to the involved random variables. This paper develops an approach based on the information bottleneck method that attempts to find such functional relationships in a neuron population. Specifically, the information bottleneck method is used to provide appropriate compact representations which can then be parsed to infer functional relationships. In the present paper, the parsing step is specialized to the case of remapped-linear functions. The approach is validated on artificial data and then applied to recordings from the motor cortex of a macaque monkey performing an arm-reaching task. Functional relationships are identified and shown to exhibit some degree of persistence across multiple trials of the same experiment.

Published
2013
Full Text
View/download PDF

13. Measurement of the proton structure functionF 2 at lowx and lowQ 2 at HERA

Author

D. Krakauer, M. L. Utley, J. Mollen, J. I. Fleck, Y. Nagasawa, P. Nylander, K. K. Joo, O. Mańczak, G. F. Hartner, R. Yoshida, J. A. Zakrzewski, Thomas Trefzger, F. J. Sciulli, K.F. Johnson, P. Bruni, Costas Foudas, A. M. Cooper-Sarkar, S. Dagan, M. Khakzad, M. L. Cardy, K. Honscheid, Yu. A. Golubkov, Vladimir Bashkirov, H. Tiecke, M. Posocco, Geoffrey Smith, L.W. Mo, Andrea Contin, C. Händel-Pikielny, J. F. Martin, N. Bruemmer, Christian Nemoz, A. Caldwell, A. Frey, F. Selonke, L. Köpke, Ulf Behrens, Federico Cindolo, W. Bogusz, A. Cassidy, Y. Iga, N. Dyce, J. Ciborowski, A. Kruse, D. Schramm, C. A. Heusch, E. Hilger, G. Grzelak, R. Ullmann, C. Voci, T. Monteiro, J. M. Pawlak, T. C. Bacon, T. Yip, Mariusz Przybycien, M. Corradi, A. Bernstein, Y. Zamora Garcia, T. Voß, M. Nakahata, Cg Matthews, M.A.J. Botje, Marcella Capua, W. Metcalf, U. Holm, A. Garfagnini, Fernando Barreiro, Mauro Morandin, Hao Zhang, M. Dardo, C. Coldewey, S. Yang, Jens Hartmann, P. Cloth, N. Pavel, I. Suzuki, William S. Lockman, K.W. McLean, S. Nickel, D. B. Miller, J. Gajewski, A. Ladage, Ricardo Graciani, S. Söldner-Rembold, K. Prytz, N. Cartiglia, K. Muchorowski, P. Kooijman, L. W. Hung, T. Neumann, Lucia Votano, T.P. Shah, E. Lohrmann, B. Löhr, C. Nath, C. P. Fagerstroem, H. Heßling, F. Palmonari, M. Krzyżanowski, W. N. Murray, S. M. Wang, S. De Pasquale, D. H. Saxon, I. H. Park, O. Yu. Lukina, Ben Bylsma, D. Lüke, A. Polini, S. Campbell-Robson, S. Kitamura, Amedeo Staiano, U. F. Katz, R. Wedemeyer, M. Basile, Rosario Nania, Sung Keun Park, J. K. Bienlein, T. Doeker, J. Milewski, S. Eisenhardt, Y. Eisenberg, H.J. Grabosch, S. Kartik, P. Göttlicher, J. Gilmore, M. Pfeiffer, T. Haas, V. D. Kobrin, T. Dubbs, Antonino Zichichi, ME Hayes, E. Tassi, A. Nigro, D.J. Gilkinson, B. Lu, S. W. Nam, R. Ayad, R. Walczak, J. Biltzinger, B.Y. Oh, M. H. Suh, M. Zachara, Krzysztof Piotrzkowski, K. Heinloth, Giuseppe Barbagli, D. Filges, J. Roldán, M. Eckert, L. Bellagamba, Shoichi Yamada, R.C.E. Devenish, Francois Corriveau, H. Hartmann, E. McCliment, D. Revel, G. Cara Romeo, A. Dannemann, H.-P. Jakob, P. Joos, R. L. Saunders, O. Deppe, J. Stamm, A.F. Whitfield, A. Kotański, A. Meyer, A. Seiden, G. Laurenti, L.A.T. Bauerdick, B. Foster, M. Lancaster, J. M. Hernandez, R. Brugnera, C. Li, G. Sartorelli, J.T. Wu, J.R. Okrasiński, J. Bulmahn, J. Zając, Yasunori Yamazaki, G. Cases, D. C. Bailey, B. Gutjahr, V. A. Kuzmin, R. Stanek, M. De Giorgi, C. Youngman, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, R. R. McNeil, E. Badura, D. Mikunas, W. N. Cottingham, C. Fordham, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, P. Morawitz, B. Y. H. Hung, Sridhara Dasu, Marcel Vreeswijk, T.L. Short, D Piccioni, B. A. Dolgoshein, John Hart, W. Schulz, Luca Stanco, K. Desler, L. Iannotti, Ada Solano, Gm Levman, S. Ritz, D. S. Hanna, Halina Abramowicz, D. C. Williams, D. S. Waters, S. Limentani, J. Del Peso, Aleksander Filip Żarnecki, Silvia Maselli, G. Briskin, E. Rulikowska-Zarcebska, Roberto Carlin, M. de Kamps, K. Charchuła, K. Yamauchi, Q. Zhu, M. Brkic, L.E. Sinclair, K. Homma, H. J. Kim, C. Glasman, N. Wulff, Cristiana Peroni, R. J. Cashmore, Roberto Sacchi, H. Kowalski, M. Z. Wang, D. Hasell, G. D'Agostini, Giovanni Maccarrone, J. K. Sedgbeer, Anselmo Margotti, Simon George, S. Mine, S. Schlenstedt, S. Bhadra, A. Bruni, T. Y. Ling, L. Lindemann, L.W. Wiggers, P. J. Bussey, M. Löwe, Tachishige Hirose, J.D. McFall, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, V. L. Harris, B. D. Burow, Giovanni Abbiendi, Robert Klanner, A. Vaiciulis, G. Bruni, M. Derrick, A. Prinias, Elisabetta Gallo, T. Tymieniecka, A. Bornheim, E. Barberis, J. A. O'Mara, P.F. Ermolov, Jose Repond, G. Anzivino, K. Ohrenberg, Giuseppe Levi, W. Koch, M. Rohde, Danuta Kisielewska, A. N. Solomin, U. Kötz, U. Mallik, Aharon Levy, D. Westphal, P. Giusti, J. T. Rahn, M. Nakao, P. Borzemski, M. Kuze, T. Massam, J. N. Lim, A. Bertolin, Greg P Heath, K. Jelen, J. Engelen, G. Zacek, G. Drews, J. A. Parsons, U. Karshon, H. Beier, A.S. Wilson, J. J. Whitmore, W. Hain, R. Sinkus, Luis Hervas, D. Zer-Zion, J. F. de Trocóniz, L. Zawiejski, W.R. Frisken, I. Ali, D. Boscherini, Tadeusz Kowalski, V. K. Nadendla, R. J. Nowak, W. H. Smith, J. Große-Knetter, Roberto Cirio, D. S. Bailey, O. Schwarzer, Helen F Heath, G. Poelz, J.F. Zhou, G. Castellini, L. Wai, Mário Costa, A. H. Walenta, DG Roff, Lutz Feld, M.C.K. Mattingly, L. S. Durkin, Douglas Gingrich, Giancarlo Susinno, B. Musgrave, M. St.Laurent, J.S.T. Ng, R. Stroili, R. Hamatsu, R. Imlay, K. Wick, E. Paul, J. Puga, F.S. Chlebana, U. Schneekloth, A. Stifutkin, I. Gialas, I. Butterworth, S. Magill, M. Adamus, J. Schroeder, S. Polenz, Ta Romanowski, G. Marini, Np Zotov, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, Masami Chiba, Klaus Kurt Desch, Matthias Kasemann, K. M. Furutani, F. F. Wilson, M. Chiarini, Leszek Adamczyk, Jonathan Butterworth, J. P. Fernandez, D. Notz, I. A. Korzhavina, M.I. Ferrero, S. H. Yon, D. Acosta, T. W. Jones, Anna Goussiou, Dg Stairs, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, R. G. Feild, J. Labs, A. Freidhof, James Crittenden, M. Grothe, L. Heinz, R. S. Orr, P. B. Straub, Kenneth Long, F. Dal Corso, Marco Schioppa, P. G. Pelfer, B. Behrens, G. Bari, R. Seidlein, T. Hasegawa, M. Van Hook, B. Bednarek, A. Leich, W.F. Badgett, H. F.W. Sadrozinski, F. Zetsche, Y. Nakamitsu, Katsuo Tokushuku, R. J. Tapper, J. Shulman, Umberto Dosselli, Debades Bandyopadhyay, Janusz Chwastowski, E. A. De Wolf, J. R. Tickner, D.D. Reeder, Juan Terron, M. Kasprzak, B. Diekmann, G. Zech, M. Flasiński, M. Wodarczyk, S. M. Hong, Masashi Hazumi, R. L. Talaga, C. Rembser, N. A. McCubbin, Samuel Silverstein, E. Stiliaris, L. Hagge, P. B. Kaziewicz, T. Ishii, R. J. Seifert, L. Lamberti, Stefano Maria Mari, A. Quadt, H. Uijterwaal, L. M. Shcheglova, A.S. Proskuryakov, C.J.S. Morgado, Michele Arneodo, R. van Woudenberg, F. Benard, M. Martinez, A. A. Savin, L. Suszycki, Giuseppe Iacobucci, R. Loveless, M. Geerts, K. Blankenship, C.R. Sampson, J.B. Lane, P. M. Patel, Gy. Wolf, Rr Rau, B. Surrow, S.H. An, V.A. Noyes, M. Roco, T. Tsurugai, S. Mengel, J. Mainusch, A. Byrne, Avto Kharchilava, W. Schott, and Cd Catterall

Subjects
Nuclear physics, Physics, Range (particle radiation), Physics and Astronomy (miscellaneous), Proton, law, Structure (category theory), Perturbative QCD, HERA, Collider, Deep inelastic scattering, law.invention, Positron energy
Abstract

We report on a measurement of the proton structure function F 2 in the range 3.5×10-5≤x≤4×10-3 and 1.5 GeV2≤Q 2≤15GeV2 at the ep collider HERA operating at a centre-of-mass energy of √s=300GeV. The rise of F 2 with decreasing x observed in the previous HERA measurements persists in this lower x and Q 2 range. The Q 2 evolution of F 2, even at the lowest Q 2 and x measured, is consistent with perturbative QCD. © 1996 Springer-Verlag.

Published
1995

14. Measurement of Charged and Neutral Currente−pDeep Inelastic Scattering Cross Sections at HighQ2

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, G. Geitz, M. Grothe, T. Haas, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H.-P. Jakob, U. F. Katz, S. M. Mari, A. Mass, S. Mengel, J. Mollen, E. Paul, Ch. Rembser, R. Schattevoy, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, N. Dyce, B. Foster, S. George, R. Gilmore, G. P. Heath, H. F. Heath, T. J. Llewellyn, C. J. S. Morgado, D. J. P. Norman, J. A. O'Mara, R. J. Tapper, S. S. Wilson, R. Yoshida, R. R. Rau, M. Arneodo, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, N. Cartiglia, J. A. Parsons, S. Ritz, F. Sciulli, P. B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, M. Przybycień, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, C. Coldewey, O. Deppe, K. Desler, G. Drews, M. Flasiński, D. J. Gilkinson, C. Glasman, P. Göttlicher, J. Grosse-Knetter, B. Gutjahr, W. Hain, D. Hasell, H. Hessling, H. Hultschig, Y. Iga, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, O. Mańczak, J. S. T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, B. Surrow, T. Voss, D. Westphal, G. Wolf, C. Youngman, J. F. Zhou, H. J. Grabosch, A. Kharchilava, A. Leich, M. Mattingly, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, A. Freidhof, S. Söldner-Rembold, J. Schroeder, T. Trefzger, N. H. Brook, P. J. Bussey, A. T. Doyle, J. I. Fleck, D. H. Saxon, M. L. Utley, A. S. Wilson, A. Dannemann, U. Holm, D. Horstmann, T. Neumann, R. Sinkus, K. Wick, E. Badura, B. D. Burow, L. Hagge, E. Lohrmann, J. Mainusch, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T. C. Bacon, I. Butterworth, E. Gallo, V. L. Harris, B. Y. H. Hung, K. R. Long, D. B. Miller, P. P. O. Morawitz, A. Prinias, J. K. Sedgbeer, A. F. Whitfield, U. Mallik, E. McCliment, M. Z. Wang, S. M. Wang, J. T. Wu, Y. Zhang, P. Cloth, D. Filges, S. H. An, S. M. Hong, S. W. Nam, S. K. Park, M. H. Suh, S. H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla, F. Barreiro, G. Cases, R. Graciani, J. M. Hernández, L. Hervás, L. Labarga, J. del Peso, J. Puga, J. Terron, J. F. de Trocóniz, G. R. Smith, F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews, P. M. Patel, L. E. Sinclair, D. G. Stairs, M. St. Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B. A. Dolgoshein, A. Stifutkin, G. L. Bashindzhagyan, P. F. Ermolov, L. K. Gladilin, Y. A. Golubkov, V. D. Kobrin, V. A. Kuzmin, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov, M. Botje, F. Chlebana, A. Dake, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L. S. Durkin, K. Honscheid, C. Li, T. Y. Ling, K. W. McLean, W. N. Murray, I. H. Park, T. A. Romanowski, R. Seidlein, D. S. Bailey, G. A. Blair, A. Byrne, R. J. Cashmore, A. M. Cooper-Sarkar, D. Daniels, R. C. E. Devenish, N. Harnew, M. Lancaster, P. E. Luffman, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes, A. Quadt, H. Uijterwaal, R. Walczak, F. F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J. M. Butterworth, R. G. Feild, B. Y. Oh, J. J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J. C. Hart, N. A. McCubbin, K. Prytz, T. P. Shah, T. L. Short, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, B. Hubbard, W. Lockman, J. T. Rahn, H. F.-W. Sadrozinski, A. Seiden, J. Biltzinger, O. Schwarzer, R. J. Seifert, A. H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, Y. Nakamitsu, K. Yamauchi, R. Cirio, M. Costa, M. I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D. C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, M. B. Crombie, D. M. Gingrich, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, C. R. Sampson, R. J. Teuscher, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, K. Blankenship, J. Kochocki, B. Lu, L. W. Mo, W. Bogusz, K. Charchuła, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wróblewski, J. A. Zakrzewski, A. F. Żarnecki, M. Adamus, Y. Eisenberg, U. Karshon, D. Revel, D. Zer-Zion, I. Ali, W. F. Badgett, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R. J. Loveless, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk, T. Tsurugai, S. Bhadra, M. L. Cardy, C.-P. Fagerstroem, W. R. Frisken, K. M. Furutani, M. Khakzad, and W.B. Schmidke

Subjects
Quantum chromodynamics, Physics, Particle physics, Neutral current, 010308 nuclear & particles physics, Scattering, Momentum transfer, General Physics and Astronomy, HERA, Deep inelastic scattering, 01 natural sciences, 7. Clean energy, Nuclear physics, Cross section (physics), 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Boson
Abstract

Deep inelastic $e~-p$ scattering has been studied in both the charged-current (CC) and neutral-current (NC) reactions at momentum transfers squared, $Q~2$, between 400 GeV$~2$ and the kinematic limit of 87500 GeV$~2$ using the ZEUS detector at the HERA $ep$ collider. The CC and NC total cross sections, the NC to CC cross section ratio, and the differential cross sections, $ d\sigma/dQ~2 $, are presented. For $Q~2 \simeq M_W~2$, where $M_W$ is the mass of the $W$ boson, the CC and NC cross sections have comparable magnitudes, demonstrating the equal strengths of the weak and electromagnetic interactions at high $Q~2$. The $Q~2$ dependence of the CC cross section determines the mass term in the CC propagator to be $M_{W} = 76 \pm 16 \pm 13$GeV.

Published
1995

15. Observation of hard scattering in photoproduction events with a large rapidity gap at HERA

Author

M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R.L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, G. Geitz, M. Grothe, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H.-P. Jakob, U.F. Katz, S.M. Mari, A. Mass, S. Mengel, J. Mollen, E. Paul, Ch. Rembser, R. Schattevoy, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, N. Dyce, B. Foster, S. George, R. Gilmore, G.P. Heath, H.F. Heath, T.J. Llewellyn, C.J.S. Morgado, D.J.P. Norman, J.A. O'Mara, R.J. Tapper, S.S. Wilson, R. Yoshida, R.R. Rau, M. Arneodo, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Eskreys, K. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, M. Przybycień, L.A.T. Bauerdick, U. Behrens, J.K. Bienlein, S. Böttcher, C. Coldewey, G. Drews, M. Flasiński, D.J. Gilkinson, P. Göttlicher, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heßling, H. Hultschig, Y. Iga, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, W. Kröger, J. Krüger, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, O. Mańczak, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, T. Voß, D. Westphal, G. Wolf, C. Youngman, H.J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, S. Qian, L. Votano, A. Bamberger, A. Freidhof, T. Poser, S. Söldner-Rembold, J. Schroeder, G. Theisen, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, I. Fleck, V.A. Jamieson, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, H. Kammerlocher, B. Krebs, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, A. Fürtjes, L. Hagge, E. Lohrmann, J. Mainusch, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, J. Terron, F. Zetsche, T.C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V.L. Harris, B.H. Hung, K.R. Long, D.B. Miller, P.P.O. Morawitz, A. Prinias, J.K. Sedgbeer, A.F. Whitfield, U. Mallik, E. McCliment, M.Z. Wang, S.M. Wang, J.T. Wu, Y. Zhang, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.W. Nam, S.K. Park, M.H. Suh, S.H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, J. del Peso, J. Puga, J.F. de Trocóniz, G.R. Smith, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, L.E. Sinclair, D.G. Stairs, M.St. Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Y.A. Golubkov, V.D. Kobrin, V.A. Kuzmin, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, S. Bentvelsen, M. Botje, F. Chlebana, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, V. O'Dell, A. Tenner, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, W.N. Murray, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, G.A. Blair, A. Byrne, R.J. Cashmore, A.M. Cooper-Sarkar, D. Daniels, R.C.E. Devenish, N. Harnew, M. Lancaster, P.E. Luffman, L. Lindemann, J. McFall, C. Nath, A. Quadt, H. Uijterwaal, R. Walczak, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, M. Iori, G. Marini, M. Mattioli, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, E. Barberis, N. Cartiglia, T. Dubbs, C. Heusch, M. Van Hook, B. Hubbard, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, J. Biltzinger, R.J. Seifert, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, S. Nagayama, Y. Nakamitsu, R. Cirio, M. Costa, M.I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, M.B. Crombie, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, C.R. Sampson, R.J. Teuscher, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, K. Blankenship, J. Kochocki, B. Lu, L.W. Mo, W. Bogusz, K. Charchuła, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, Y. Eisenberg, C. Glasman, U. Karshon, D. Revel, A. Shapira, I. Ali, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, T. Tsurugai, S. Bhadra, W.R. Frisken, K.M. Furutani, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Proton, Astrophysics::High Energy Astrophysical Phenomena, Hadron, FOS: Physical sciences, Astronomy & Astrophysics, DIFFRACTION, 01 natural sciences, High Energy Physics - Experiment, Physics, Particles & Fields, law.invention, COLLIDER, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, DESIGN, law, 0103 physical sciences, Rapidity, CALORIMETER, Nuclear Experiment, 010306 general physics, Collider, DETECTOR, Physics, Research Groups and Centres\Physics\Low Temperature Physics, Science & Technology, ZEUS (particle detector), Faculty of Science\Physics, hep-ex, 010308 nuclear & particles physics, Scattering, ZEUS, diffractive scattering, HERA, photoproduction, Nuclear & Particles Physics, POMERON STRUCTURE, Physics, Nuclear, PHOTON, Physical Sciences, JETS, High Energy Physics::Experiment
Abstract

Events with a large rapidity gap and total transverse energy greater than 5 GeV have been observed in quasi-real photoproduction at HERA with the ZEUS detector. The distribution of these events as a function of the $\gamma p$ centre of mass energy is consistent with diffractive scattering. For total transverse energies above 12 GeV, the hadronic final states show predominantly a two-jet structure with each jet having a transverse energy greater than 4 GeV. For the two-jet events, little energy flow is found outside the jets. This observation is consistent with the hard scattering of a quasi-real photon with a colourless object in the proton., Comment: 19 pages, latex, 4 figures appended as uuencoded file

Published
1995

16. Improved task-allocation algorithms to maximize reliability of redundant distributed computing systems

Author

C. Siva Ram Murthy and S. Kartik

Subjects
Branch and bound, Computer science, Efficient algorithm, Distributed computing, Computation, Search tree, Algorithms, Computational complexity, Heuristic methods, Optimization, Redundancy, Reliability, Trees (mathematics), Task allocation algorithms, Distributed computer systems, Task analysis, Redundancy (engineering), Electrical and Electronic Engineering, Safety, Risk, Reliability and Quality, Heuristics, Time complexity, Algorithm
Abstract

This paper considers the problem of finding an optimal & sub-optimal task-allocation (assign the processing node for each module of a task or program) in redundant distributed computing systems, with the goal of maximizing system-reliability (probability that the system completes the entire task successfully). Finding an optimal task-allocation is NP-hard in the strong sense. An efficient algorithm is presented for optimal task-allocation in a distributed computing system with level-2 redundancy. The algorithm, a) uses branch & bound with underestimates for reducing the average time complexity of optimal task-allocation computations, and b) reorders the list of modules to allow a subset of modules that does not intra-communicate to be assigned last, for further reduction in the computations of optimal task-allocation for maximizing reliability. An efficient heuristic algorithm is given which obtains sub-optimal solutions in a reasonable computation time. The performance of our algorithms is given over a wide range of parameters such as: number of modules, number of processing nodes, ratio of average execution cost to average communication cost, and connectivity of modules. The effectiveness of the optimal task-allocation algorithm is demonstrated by comparing it to a recent competing optimal task-allocation algorithm, for maximizing reliability. The performance of our algorithm improves very much when the difference between the number of modules and the connectivity increases. Our heuristic algorithm produced optimal solutions in 24% of the cases and found allocations within 1.5 times the optimal in about 86% of the cases.1 ?1995 IEEE

Published
1995

17. A measurement of σtot(γp) at

Author

Ada Solano, S. Limentani, M. Z. Wang, G.A. Blair, A. Seidman, Stan Bentvelsen, D. Haun, Giuseppe Iacobucci, S. Kartik, Francois Corriveau, A. Kotański, P. Morawitz, S. Kasai, A. Cassidy, M. Nakahata, Marco Schioppa, P. G. Pelfer, S.J.P. Smith, K. U. Pösnecker, J. Nash, U. Schneekloth, T. Neumann, T. Barillari, Y. Eisenberg, M. M. Mobayyen, R. Seidlein, A. Mass, Roberto Casalbuoni, S. Kitamura, P.F. Ermolov, H. F.W. Sadrozinski, A. Shapira, Fernando Barreiro, D. Monaldi, K. Heinloth, R. Casaccia, H. Müsch, P. Cloth, J. Kochocki, Mauro Morandin, Z. Jakubowski, Giuseppe Levi, I. Gialas, R. Imlay, Rosario Nania, S. De Jong, S. Magill, A. Prinias, K. Jelen, Ulf Behrens, Federico Cindolo, H. Kowalski, F. Ciralli, W. Koch, F. J. Sciulli, A. Hofmann, Tadeusz Kowalski, C.J.S. Morgado, A. Freidhof, Michele Arneodo, N.C. Roocroft, S. Kramarczyk, L. W. Hung, J. Engelen, G. Poelz, James Crittenden, A. Dannemann, G. Sartorelli, A Furtjes, F. Gasparini, A. A. Savin, J. F. Labs, L. Suszycki, A. Bargende, W. Dorth, F. Dal Corso, J. Straver, L. Hagge, N. Dyce, Tobias M. Haas, T. Hasegawa, A. Leich, A. Margotti, Roberto Carlin, Shoichi Yamada, R.C.E. Devenish, Debades Bandyopadhyay, D. Revel, A. A. Voronin, T. Ishii, B. Lisowski, T. J. Llewellyn, A. Stopczyński, C. Voci, Silvia Maselli, M. Momayezi, G. Laurenti, G. Barbagli, G. Cara Romeo, E. Tscheslog, S. Nagayama, R. Ayed, R. L. Talaga, S. Bhadra, F. Ikraiam, G. Cases, R. Yoshida, B.D. Burow, I. Butterworth, T. Kȩdzierski, Y. Iga, J. M. Pawlak, A. Vorvolakos, D. McQuillan, A. Zichichi, Matthias Kasemann, R. Timellini, A. Dake, D. Notz, C. Nemoz, K. Muchorowski, N. H. Brook, T.L. Short, R. R. McNeil, Ta Romanowski, Daniele Dominici, R. Wedemeyer, J.D. Prentice, E. Barberis, Samuel Silverstein, K. Charchuła, P. Erhard, Jens Hartmann, T. W. Jones, Anna Goussiou, M. Löwe, R. Loveless, U. Mallik, T. Khatri, J.W. Mitchell, Greg P Heath, L. Chen, Eduardo Ros, R. J. Cashmore, G. L. Bashindzhagyan, R. J. Teuscher, M. Geerts, K. Blankenship, Luis Labarga, J. J. Whitmore, M. Derrick, T. Tymieniecka, Danuta Kisielewska, C.R. Sampson, R. J. Seifert, P.M. Hallam-Baker, H. Dabbous, M. de Kamps, N. Pavel, G. Grzelak, J. F. Martin, P. Kooijman, F. F. Wilson, M. Chiarini, U. Kötz, Vivian O'Dell, H. J. Kim, T. C. Bacon, M. Lomperski, Stefano Maria Mari, R. Gläser, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, A. Francescato, C. Youngman, Hideki Okuno, W. Burkot, R. J. Nowak, S. De Pasquale, J.K. Mayer, S. Schlenstedt, I. Laakso, M. Brkic, J. K. Bienlein, R. Szwed, D. Shaw, P. J. Bussey, S. Qian, G. D'Agostini, Ben Bylsma, B. Lu, J. Milewski, J. Krüger, J. F. de Trocóniz, M. Nuti, J. Schroeder, H. Chaves, Masashi Hazumi, L. Zawiejski, T. Y. Ling, P. de Jong, Q. Lin, Inkyu Park, F. Benard, G. Zech, S. De Curtis, H. Hartmann, Y. Nakamitsu, Katsuo Tokushuku, Giovanni Abbiendi, M.I. Ferrero, R. J. Tapper, Robert Klanner, M. Rohde, N. A. McCubbin, T. S. Yoon, K. Wick, B. Musgrave, I. Fleck, Thomas Trefzger, A.G. Tenner, H.-P. Jakob, H. van der Lugt, Umberto Dosselli, J.B. Lane, E. Paul, David Cussans, Janusz Chwastowski, K. Sugano, Rr Rau, R. Brugnera, L. S. Durkin, J. N. Lim, A. Contin, W. Weihs, D. J. Gilkinson, V. A. Kuzmin, D. C. Bailey, E. A. De Wolf, G. Jahnen, Claudia Glasman, Sridhara Dasu, M. De Giorgi, Halina Abramowicz, K. Stojda, W. Metcalf, F. Turkot, R. Stanek, U. Holm, S. Mengel, J. Mainusch, Gm Levman, B. Gutjahr, Luca Stanco, C. Markou, M. Adamus, G. Marini, B. Löhr, E. Badura, M. Kückes, Np Zotov, A.K. Wróblewski, A. Bamberger, C. Rethfeldt, W. Schott, F. Selonke, E. Hilger, T. Bienz, G. Bruni, S. D'Auria, P. Joos, Cd Catterall, R. Heifetz, F. Arzarello, M. Rost, A. Meyer, B. Foster, F. W. Bullock, Mariusz Flasiński, Luisa Cifarelli, M. Krzyżanowski, A. Byrne, Neville Harnew, J. Roldán, B. Schneider, M. Lancaster, D.D. Reeder, A. Montag, B. Diekmann, B.Y. Oh, E. Rulikowska-Zarȩbska, Krzysztof Piotrzkowski, J.A. Zakrzewski, C. A. Heusch, C. Raine, P. Nylander, J. Leslie, J. Del Peso, T. Watanabe, C. Li, Lucia Votano, E. Lohrmann, Kr Long, C. Fordham, G. Castellini, M. Zachara, H. Kreutzmann, L.E. Sinclair, J. C. Vermeulen, M. Mattioli, R. van Woudenberg, G. Theisen, U. Karshon, Lothar At Bauerdick, T. Woeniger, L. Lamberti, F.S. Chlebana, K.M. Furutani, M.B. Crombie, H. Uijterwaal, P.M. Patel, A.F. Żarnecki, W. Schulz, Luis Hervas, D. Boscherini, W.N. Murray, G. Anzivino, G. Susinno, M. Nakao, P. Borzemski, R. S. Orr, P. B. Straub, E.E. Ronat, B. Behrens, Nicolo Cartiglia, J. Ciborowski, R. Ullmann, S. Yang, V.A. Jamieson, M. Dardo, C. Coldewey, R.S. Gilmore, H.J. Grabosch, B. Krebs, F. Zetsche, J. L. Thron, D. Lüke, T. Poser, M. Bonori, Maurizio Basile, S. Nickel, L. Bellagamba, D. B. Miller, J. Gajewski, T. Massam, J. Biltzinger, A.H. Walenta, H. Hultschig, H. Kammerlocher, B. H. Wiik, John Hart, I. Ali, Wr Frisken, S. Ritz, D. S. Hanna, L.W. Wiggers, Masami Chiba, G. Maccarrone, Klaus Kurt Desch, C. Del Papa, I. McArthur, P. Bruni, Costas Foudas, L.W. Mo, Michele Guida, Jose Repond, W. H. Smith, A. Caldwell, G.G. Stairs, G. Gloth, Mário Costa, U. Contino, T. Tsurugai, E. McCliment, J.C. Giddings, D.M. Gingrich, A. Seiden, F. Frasconi, M. Przybycień, F. Palmonari, S.S. Wilson, D. Zer-Zion, A. T. Doyle, A.M. Khan, R. Schattevoy, G. Bari, J.-L. Schneider, W. Vogel, P. Luffman, K. Eskreys, T.P. Shah, D. H. Saxon, J.S.T. Ng, P. Göttlicher, B. Hubbard, M. Ptacek, Aharon Levy, J.R. Forbes, K.W. McLean, D. Krakauer, A. Ladage, S. Söldner-Rembold, M. Iori, A. Nigro, Y. Nagasawa, A. Dwuraźny, J. Mollen, H.F. Fawcett, E.N. Kuznetsov, O. Mańczak, G. F. Hartner, U. Camerini, A. M. Cooper-Sarkar, S. Dagan, R. Walczak, Yu. A. Golubkov, H. Tiecke, M. Posocco, Geoffrey Smith, Detlef Filges, D. K. Hasell, K. O'Shaughnessy, A. Kruse, J. Shulman, R. Salomon, Juan Terron, M. Kasprzak, P. Giusti, G. Drews, J. A. Parsons, W. Hain, K. Dierks, J. M. Butterworth, J. Zaja̧c, B. Nizioł, A. Eskreys, S. K. Park, Amedeo Staiano, Tachishige Hirose, M. Kuze, R. Hamatsu, J. Kulka, L. Wai, P.L. Makkar, R. Stroili, C. Peroni, M. Roco, G. Geitz, W. Kröger, Dg Stairs, J. Malos, and C. Fanin

Subjects
Physics, Nuclear and High Energy Physics, ZEUS (particle detector), Photon, High Energy Physics::Phenomenology, Nuclear Theory, Detector, Virtual particle, HERA, Particle detector, Particle scattering, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Nuclear Experiment
Abstract

The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q2 values of the virtual photons are in the range 10−7

Published
1992

18. 238 Comparative Evaluation of the Performance of Abbott m2000rt Real-Time HIV-1 Assay for Measurement of HIV-1 Plasma Viral Load

Author

K G Murugavel, S Kartik, Kartik K. Venkatesh, Suniti Solomon, N. Kumarasamy, Madhavan Vidya, Kenneth H. Mayer, Sunil S. Solomon, Shanmugam Saravanan, and P. Balakrishnan

Subjects
Infectious Diseases, business.industry, Human immunodeficiency virus (HIV), Medicine, Pharmacology (medical), business, medicine.disease_cause, Virology, Plasma viral load, Comparative evaluation
Published
2009

19. Jet shapes at HERA

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

The shape of jets produced in quasi-real photon-proton interactions and deep inelastic positron-proton scattering (DIS) at high Q(2) (Q(2) > 100 GeV2) has been measured with the ZEUS detector at HERA. Jets with transverse energies E-T(jet) > 14 GeV and pseudorapidities (eta(jet)) in the range -1 < eta(jet) < 2 are searched for using a cone algorithm in the ep-laboratory frame in the eta - phi plane with a cone radius of one unit. The jet shape broadens as eta(jet) increases and narrows as E-T(jet) increases. Next-to-leading order QCD calculations for inclusive jet photoproduction provide predictions for the jet shapes at the parton level which are found to be consistent with the measurements. The measured jet shapes in neutral current DIS are compared to those in photon-proton collisions and are found to be narrower. The measured jet shapes in DIS are found to be narrower than those in collisions, and are similar to those in e(+)e(-) interactions.

Published
1997

20. High Q(2) events in ep collisions

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

Using the ZEUS detector at HERA, we have studied the reaction e(+) p --> e(+) X for Q(2) > 5000 GeV2 with a 20.1 pb(-1) data sample collected during the years 1994 to 1996. For Q(2) below 15000 GeV2, the data are in good agreement with Standard Model expectations. For Q(2) > 35000 GeV2, two events are observed while 0.145 +/- 0.013 events are expected. For x > 0.55 and y > 0.25, four events are observed where 0.91 +/- 0.08 events are expected. The observed excess above Standard Model expectations is particularly interesting because it occurs in a previously unexplored kinematic region.

Published
1997

21. Leading baryons at low x(L) in DIS and photoproduction at ZEUS

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

Results obtained by the ZEUS collaboration on leading baryon production in the proton fragmentation region are presented. The reaction gamma p --> NX, with N a proton or a neutron, is examined both at low and high photon virtuality.

Published
1997

22. Forward transverse energy flow and forward jets at low x

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

Transverse energy flow and forward jet cross sections at low values of x(Bj) are measured with the ZEUS detector at HERA in order to study the underlying parton dynamics (DGLAP versus BFKL). The energy how has been compared to different model simulations, but hadronization effects are too large to draw a firm conclusion. The measured jet cross section for 10(-4) < x(Bj) < 5.10(-3) is for the lower x(Bj)-bins larger than that of NLO QCD DGLAP calculations but lies still below a more qualitative BFKL prediction.

Published
1997

23. Measurement of the proton structure function F-2 and the total gamma*p cross-section at low Q(2) and low x

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

The ZEUS-experiment at HERA has significantly enhanced the kinematic coverage for low Q(2) and low x inelastic e(+)p --> e(+) X scattering with an upgrade of the ZEUS-detector in 1995 which extends the acceptance for small positron scattering angles. The upgrade included the modification of the beam pipe with low mass exit windows and the installation of a small electromagnetic sampling calorimeter, the Beam Pipe Calorimeter (BPC), to explore the region in Q(2) of 0.11 less than or equal to Q(2) less than or equal to 0.65 GeV2. A shift of two rear uranium calorimeter (RCAL) modules and the small rear tracking detector (SRTD) closer to the beam together with a data sample taken with a shifted event vertex extended the Q(2) coverage of the main detector down to 0.6 GeV2. Both data sets have been used to measure the proton structure function F-2 and the total virtual photonproton gamma*p cross-section. Results are presented for 0.11 less than or equal to Q(2) less than or equal to 6.10 GeV2 and 2.10(-6) less than or equal to x less than or equal to 7.10(-4) along with a comparison to various models.

Published
1997

24. QCD fits to ZEUS and fixed target structure function data

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

Preliminary results are presented on the gluon density at low x obtained from a QCD analysis of ZEUS 1994 F-2 structure function data combined with those from NMC. Also given are estimates of the experimental error on the e(+) p NC Born cross section at large x and Q(2). This estimate is obtained from propagation of the statistical and systematic errors on fixed target structure functions.

Published
1997

25. F-2(D(3)) measurements at ZEUS

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, S. M. Mari18, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. ZEUS Collaboration M. Derrick, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, S. M., Mari18, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T. ZEUS Collaboration M., Derrick, Mari, Stefano Maria, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

Results on the diffractive structure function F-2(D(3)) in deep inelastic neutral current positron-proton scattering (DIS) have been obtained by the ZEUS collaboration using two different methods. Diffractive interactions are selected by either requiring a small, not exponentially suppressed invariant hadronic mass M-X in the main detector or by detecting a fast proton in the ZEUS leading proton spectrometer (LPS). The results of the two methods are compared.

Published
1997

26. Measurement of dijets in DIS and comparison to NLO calculations

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

We report a measurement of the dijet production cross section in neutral current deep inelastic scattering with the ZEUS detector at the HERA ep collider. Dijet events are identified with the cone algorithm and the results are compared to next-to-leading order perturbative QCD calculations. The systematic uncertainties of both the measurement and the calculation we discussed.

Published
1997

27. Searches at HERA for excited fermions, contact interactions, a heavy neutrino, and: a HERA excess?

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Subjects
Condensed Matter::Quantum Gases, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

Results are presented on a number of searches for new physics in ep collisions at HERA using the ZEUS and HI detectors. Limits are presented on the production of elicited fermions, contact interactions, as well as a heavy right handed neutrino and W-R boson. Also presented are ZEUS results on the excess of events at high x and Q(2).

Published
1997

28. Event shape analysis of multihadronic final states in deep inelastic rapidity gap events at HERA

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A global event shape analysis of the multihadronic final states observed in deep inelastic scattering (DIS) with a large forward rapidity gap (LRG) is performed in the range Q(2) greater than or equal to 5 GeV2, 160 GeV less than or equal to W less than or equal to 250 GeV and eta(max) less than or equal to 1.8. Particular emphasis is paid to the dependence of these variables, measured in the gamma*-pomeron rest frame, upon M-X, the mass of the hadronic final state. With increasing M-X the multihadronic final states become planar. The broadening effects exhibited by the data can be described by including a gluon density in models where the pomeron has a partonic structure or alternatively by considering a direct coupling of the pomeron to quark and gluon pairs.

Published
1997

29. Diffractive measurements from ZEUS

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Subjects
High Energy Physics::Phenomenology, Physics::Optics, High Energy Physics::Experiment, Computer Science::Cryptography and Security
Abstract

Recent results on diffraction from the ZEUS Collaboration at HERA are presented. Properties of the diffractive photon dissociation in photoproduction and deep inelastic scattering were studied and the intercept of the pomeron, alpha(IP)(0), was inferred.

Published
1997

30. Diffractive production of charm and jets at HERA

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

Measurements are presented of dijet cross sections in diffractive photoproduction and of D*(+/-) production in diffractive deep inelastic scattering at HERA. A combined QCD analysis of the diffractive dijet cross sections and diffractive structure function results leads to a picture in which the pomeron has a substantial gluon component with a hard momentum spectrum.

Published
1997

31. Fragmentation functions at ZEUS

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Abstract

The scaled momentum spectra of final state charged hadrons produced in Deep Inelastic Scattering in the ranges 10 < Q(2) < 1280 GeV2 and 6 . 10(-4) < x(Bjorken) < 5 . 10(-2) have been measured in the current region of the Breit frame using the ZEUS detector. The evolution with Q(2) of the scaled momentum, x(p) = 2p(Breit)/Q, has been investigated and preliminary results are presented which show evidence for scaling violations and support for the universality of quark fragmentation.

Published
1997

32. D* and J/psi inelastic photoproduction at HERA

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. R. Okrasin´ ski, J. Repond, R. Stanek, R. L. Ta laga, H. Zhang Argonne National Laboratory, Argonne, IL 60439, USA p. M. C. K. Mattingly Andrews University, Berrien Springs, USA F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini1, L. Cifarelli2, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia3, A. Zichichi University, INFN Bologna, I. 40126 Bologna, Italy f. C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, M. Eckert, L. Feld, A. Frey4, M. Geerts5, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, S. Mengel6, E. Paul, M. Pfeiffer, C.h. Rembser, D. Schramm7, J. Stamm, R. Wedemeyer Physikalisches Institut der Universita¨t Bonn, D. 53115 Bonn, Germany c. S. Campbell Robson, A. Cassidy, W. N. Cottingham, N. Dyce, B. Foster, S. George, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol B58 1TL, U. K. o. M. Arneodo8, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno Calabria University, Physics D.e.p.t. and INFN, Cosenza, Italy f. A. Caldwell9, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz10, F. Sciulli, P. B. Straub, L. Wai11, S. Yang12, Q. Zhu Columbia University, Nevis Labs, Irvington on Hudson, NY 10533, USA q. P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycien´, M. Zachara, L. Zawiejski I.n.s.t. of Nuclear Physics, PL 30055 Cracow, Poland j. L. Adamczyk, B. Bednarek, K. Jelen´, D. Kisielewska, T. Kowalski, M. Przybycien´, E. Rulikowska Zare¸bska, L. Suszycki, J. Zaja¸c Faculty of Physics, Nuclear Techniques, Academy of Mining, Metallurgy, Poland j. Z. Dulin´ ski, A. Kotan´ ski Jagellonian Univ, D.e.p.t. of Physics, PL 30059 Cracow, Poland k. G. Abbiendi13, L. A. T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasin´ ski14, D. J. Gilkinson, C. Glasman, P. Go¨ ttlicher, J. Große Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson15, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Ko¨ tz, H. Kowalski, J. Labs, A. Ladage, B. Lo¨ hr, M. Lo¨ we, D. Lu¨ ke, J. Mainusch16, O. Man´ czak, J. Milewski, T. Monteiro17, J. S. T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Rolda´n, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner Deutsches Elektronen Synchrotron DESY, D. 22603 Hamburg, Germany H. J. Grabosch, A. Meyer, S. Schlenstedt DESY IfH Zeuthen, D. 15738 Zeuthen, Germany G. Barbagli, E. Gallo, P. Pelfer University, INFN, Florence, Italy f. G. Maccarrone, S. De Pasquale, L. Votano INFN, Laboratori Nazionali di Frascati, I. 00044 Frascati, Italy f. A. Bamberger, S. Eisenhardt, T. Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B.r., D. 79104 Freiburg i. B.r., Germany c. J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson D.e.p.t. of Physics, Astronomy, University of Glasgow, Glasgow G12 8QQ, U. K. o. A. Dannemann20, U. Holm, D. Horstmann, R. Sinkus21, K. Wick Hamburg University, I. Institute of E.x.p. Physics, D. 22761 Hamburg, Germany c. B. D. Burow22, L. Hagge16, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche Hamburg University, I.I. Institute of E.x.p. Physics, Germany c. T. C. Bacon, N. Bru¨ mmer, I. Butterworth, V. L. Harris, G. Howell, B. H. Y. Hung, L. Lamberti23, K. R. Long, D. B. Miller, N. Pavel, A. Prinias24, J. K. Sedgbeer, D. Sideris, A. F. Whitfield Imperial College London, High Energy Nuclear Physics Group, London SW7 2BZ, U. K. o. U. Mallik, M. Z. Wang, S. M. Wang, J. T. Wu University of Iowa, Physics, Astronomy Dept, Iowa City, IA 52242, USA p. P. Cloth, D. Filges Forschungszentrum Ju¨ lich, Institut fu¨ r. Kernphysik, D. 52405 Ju¨ lich, Germany S. H. An, G. H. Cho, B. J. Ko, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park Korea University, Seoul 136 701, Korea h. S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Baton Rouge, LA 70803 4001, USA p. F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Herna´ndez, L. Herva´s, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J. F. de Troco´ niz U.n.i.v.e.r. Auto´ noma Madrid, Depto de F´ısica Teo´ r´ıca, E. 28049 Madrid, Spain n. F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews25, W. N. Murray, A. Ochs, P. M. Patel, M. Riveline, D. G. Stairs, M. St Laurent, R. Ullmann, G. Zacek25 McGill University, Montre´al, PQ H3A 2T8, Canada a, b. T. Tsurugai Meiji Gakuin University, Faculty of General Education, Yokohama 244, Japan V. Bashkirov, B. A. Dolgoshein, A. Stifutkin Moscow Engineering Physics Institute, RU 115 409 Moscow, Russia l. G. L. Bashindzhagyan26, P. F. Ermolov, L. K. Gladilin, Y.u. A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Y.u. Lukina, A. S. Proskuryakov, A. A. Savin, L. M. Shcheglova, A. N. Solomin, N. P. Zotov Moscow State University, Institute of Nuclear Physics, RU 119 899 Moscow, Russia m. M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg27 NIKHEF, University of Amsterdam, NL 1009 DB Amsterdam, Netherlands i. D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, C. Li, T. Y. Ling, P. Nylander, I. H. Park, T. A. Romanowski28 Ohio State University, Physics Department, Columbus, OH 43210 1106, USA p. D. S. Bailey, R. J. Cashmore29, A. M. Cooper Sarkar, R. C. E. Devenish, N. Harnew, M. Lancaster30, L. Lindemann, J. D. McFall, C. Nath, V. A. Noyes24, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, F. F. Wilson, T. Yip Department of Physics, University of Oxford, Oxford, U. K. o. A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin Dipartimento di Fisica dell’ Universita, INFN, I. 35131 Padova, Italy f. J. Bulmahn, R. G. Feild31, B. Y. Oh, J. J. Whitmore Pennsylvania State University, University Park, PA 16802, USA q. G. D’Agostini, G. Marini, A. Nigro Dipartimento di Fisica, U.n.i.v. ’La Sapienza’, I. 00185 Rome, Italy f. J. C. Hart, N. A. McCubbin, T. P. Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U. K. o. E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F. W. Sadrozinski, A. Seiden, D. C. Williams University of California, Santa Cruz, CA 93106, USA p. J. Biltzinger, R. J. Seifert, O. Schwarzer, A. H. Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D. 57012 Siegen, Germany c. H. Abramowicz, G. Briskin, S. Dagan32, T. Doeker32, A. Levy26 Raymond, Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University, Tel Aviv 69978, Israel e. J. I. Fleck33, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo 113, Japan g. M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura34, T. Matsushita, K. Yamauchi Tokyo Metropolitan University, Tokyo 192 03, Japan g. R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano Universita di Torino, Dipartimento di Fisica Sperimentale, I. 10129 Torino, Italy f. M. Dardo II Faculty of Sciences, Torino University, INFN Alessandria, Italy f. D. C. Bailey, F. Benard, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher University of Toronto, Toronto, ON M5S 1A7, Canada a. J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton University College London, London WC1E 6BT, U. K. o. B. Lu, L. W. Mo Virginia Polytechnic Inst, State University, Physics Dept, Blacksburg, VA 24061, USA q. W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak35, M. Kasprzak, M. Krzyz˙anowski, K. Muchorowski36, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wro´ blewski, J. A. Zakrzewski, A. F. Z˙ arnecki Warsaw University, Institute of Experimental Physics, PL 00681 Warsaw, Poland j. M. Adamus Institute for Nuclear Studies, Poland j. C. Coldewey, Y. Eisenberg32, D. Hochman, U. Karshon32, D. Revel32, D. Zer Zion Weizmann Institute, Nuclear Physics Dept, Rehovot 76100, Israel d. W. F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, S. Silverstein, W. H. Smith, A. Vaiciulis, M. Wodarczyk University of Wisconsin, Madison, WI 53706, USA p. S. Bhadra, M. L. Cardy37, W. R. Frisken, M. Khakzad, W. B. Schmidke York University, North York, Toronto ON M3J 1P3, Canada a., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, D., Mikuna, B., Musgrave, J. R., Okrasin´ ski, J., Repond, R., Stanek, R. L., Ta laga, H., Zhang Argonne National Laboratory, Argonne, Il, 60439, USA p. M. C. K., Mattingly Andrews University, Berrien, Spring, Mi, USA F., Anselmo, P., Antonioli, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini1, L., Cifarelli2, F., Cindolo, A., Contin, M., Corradi, I., Giala, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, A., Margotti, T., Massam, R., Nania, F., Palmonari, A., Pesci, A., Polini, G., Sartorelli, Y., Zamora Garcia3, A., Zichichi University, Infn, Bologna, I., 40126 Bologna, Italy f. C., Amelung, A., Bornheim, J., Crittenden, R., Deffner, M., Eckert, L., Feld, A., Frey4, M., Geerts5, M., Grothe, H., Hartmann, K., Heinloth, L., Heinz, E., Hilger, H. P., Jakob, U. F., Katz, S., Mengel6, E., Paul, M., Pfeiffer, Rembser, C. h., D., Schramm7, J., Stamm, R., Wedemeyer Physikalisches Institut der Universita¨t Bonn, D., 53115 Bonn, Germany c. S., Campbell Robson, A., Cassidy, W. N., Cottingham, N., Dyce, B., Foster, S., George, M. E., Haye, G. P., Heath, H. F., Heath, D., Piccioni, D. G., Roff, R. J., Tapper, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol B58, 1tl, U. K. o. M., Arneodo8, R., Ayad, M., Capua, A., Garfagnini, L., Iannotti, M., Schioppa, G., Susinno Calabria University, and INFN, Physics D. e. p. t., Cosenza, Italy f. A., Caldwell9, N., Cartiglia, Z., Jing, W., Liu, J. A., Parson, S., Ritz10, F., Sciulli, P. B., Straub, L., Wai11, S., Yang12, Q., Zhu Columbia University, Nevis, Lab, Irvington on, Hudson, Ny, 10533, USA q. P., Borzemski, J., Chwastowski, A., Eskrey, Z., Jakubowski, M. B., Przybycien´, M., Zachara, of Nuclear Physics, L. Zawiejski I. n. s. t., PL 30055, Cracow, Poland j. L., Adamczyk, B., Bednarek, K., Jelen´, D., Kisielewska, T., Kowalski, M., Przybycien´, E., Rulikowska Zare¸bska, L., Suszycki, J., Zaja¸c Faculty of Physic, Nuclear, Technique, Academy of, Mining, Metallurgy, Poland j. Z., Dulin´ ski, A., Kotan´ ski Jagellonian Univ, of Physics, D. e. p. t., PL 30059, Cracow, Poland k. G., Abbiendi13, L. A. T., Bauerdick, U., Behren, H., Beier, J. K., Bienlein, G., Case, O., Deppe, K., Desler, G., Drew, M., Flasin´ ski14, D. J., Gilkinson, C., Glasman, P., Go¨ ttlicher, J., Große Knetter, T., Haa, W., Hain, D., Hasell, H., Heßling, Y., Iga, K. F., Johnson15, P., Joo, M., Kasemann, R., Klanner, W., Koch, U., Ko¨ tz, H., Kowalski, J., Lab, A., Ladage, B., Lo¨ hr, M., Lo¨ we, D., Lu¨ ke, J., Mainusch16, O., Man´ czak, J., Milewski, T., Monteiro17, J. S. T., Ng, D., Notz, K., Ohrenberg, K., Piotrzkowski, M., Roco, M., Rohde, J., Rolda´n, U., Schneekloth, W., Schulz, F., Selonke, B., Surrow, E., Tassi, T., Voß, D., Westphal, G., Wolf, U., Wollmer, C., Youngman, W., Zeuner Deutsches Elektronen Synchrotron DESY, D., 22603 Hamburg, Germany H. J., Grabosch, Mari, Stefano Maria, A., Meyer, S., Schlenstedt DESY IfH Zeuthen, D., 15738 Zeuthen, Germany G., Barbagli, E., Gallo, P., Pelfer University, Infn, Florence, Italy f. G., Maccarrone, S., De Pasquale, L., Votano INFN, Laboratori Nazionali di, Frascati, I., 00044 Frascati, Italy f. A., Bamberger, S., Eisenhardt, T., Trefzger19, S. Wo¨ lfle Fakulta¨t fu¨ r. Physik der Universita¨t Freiburg i. B., R., D. 79104 Freiburg i. B., R., Germany c. J. T., Bromley, N. H., Brook, P. J., Bussey, A. T., Doyle, D. H., Saxon, L. E., Sinclair, E., Strickland, M. L., Utley, R., Waugh, of Physics, A. S. Wilson D. e. p. t., Astronomy, University of, Glasgow, Glasgow G12, 8qq, U. K. o. A., Dannemann20, U., Holm, D., Horstmann, R., Sinkus21, K., Wick Hamburg University, Physics, I. Institute of E. x. p., D., 22761 Hamburg, Germany c. B. D., Burow22, L., Hagge16, E., Lohrmann, G., Poelz, W., Schott, F., Zetsche Hamburg University, Physics, I. I. Institute of E. x. p., Germany c. T. C., Bacon, N., Bru¨ mmer, I., Butterworth, V. L., Harri, G., Howell, B. H. Y., Hung, L., Lamberti23, K. R., Long, D. B., Miller, N., Pavel, A., Prinias24, J. K., Sedgbeer, D., Sideri, A. F., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London SW7, 2bz, U. K. o. U., Mallik, M. Z., Wang, S. M., Wang, J. T., Wu University of Iowa, Physics, Astronomy, Dept, Iowa, City, Ia, 52242, USA p. P., Cloth, D., Filges Forschungszentrum Ju¨ lich, Institut fu¨ r., Kernphysik, D., 52405 Ju¨ lich, Germany S. H., An, G. H., Cho, B. J., Ko, S. B., Lee, S. W., Nam, H. S., Park, S. K., Park Korea University, Seoul 136, 701, Korea h. S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Baton, Rouge, LA 70803, 4001, USA p. F., Barreiro, J. P., Fernandez, R., Graciani, J. M., Herna´ndez, L., Herva´, L., Labarga, M., Martinez, J., del Peso, J., Puga, J., Terron, Auto´ noma Madrid, J. F. de Troco´ niz U. n. i. v. e. r., Depto de F´ısica Teo´, R´ıca, E., 28049 Madrid, Spain n. F., Corriveau, D. S., Hanna, J., Hartmann, L. W., Hung, J. N., Lim, C. G., Matthews25, W. N., Murray, A., Och, P. M., Patel, M., Riveline, D. G., Stair, M., St Laurent, R., Ullmann, G., Zacek25 McGill University, Montre´al, PQ H3A, 2t8, Canada, A, b. T., Tsurugai Meiji Gakuin University, Faculty of General, Education, Yokohama, 244, Japan V., Bashkirov, B. A., Dolgoshein, A., Stifutkin Moscow Engineering Physics Institute, RU 115 409, Moscow, Russia l. G. L., Bashindzhagyan26, P. F., Ermolov, L. K., Gladilin, Golubkov, Y. u. A., V. D., Kobrin, I. A., Korzhavina, V. A., Kuzmin, Lukina, O. Y. u., A. S., Proskuryakov, A. A., Savin, L. M., Shcheglova, A. N., Solomin, N. P., Zotov Moscow State University, Institute of Nuclear, Physic, RU 119 899, Moscow, Russia m. M., Botje, F., Chlebana, J., Engelen, M., de Kamp, P., Kooijman, A., Kruse, A., van Sighem, H., Tiecke, W., Verkerke, J., Vossebeld, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg27 NIKHEF, University of, Amsterdam, NL 1009 DB, Amsterdam, Netherlands i. D., Acosta, B., Bylsma, L. S., Durkin, J., Gilmore, C. M., Ginsburg, C. L., Kim, C., Li, T. Y., Ling, P., Nylander, I. H., Park, T. A., Romanowski28 Ohio State University, Physics, Department, Columbus, OH 43210, 1106, USA p. D. S., Bailey, R. J., Cashmore29, A. M., Cooper Sarkar, R. C. E., Devenish, N., Harnew, M., Lancaster30, L., Lindemann, J. D., Mcfall, C., Nath, V. A., Noyes24, A., Quadt, J. R., Tickner, H., Uijterwaal, R., Walczak, D. S., Water, F. F., Wilson, T., Yip Department of Physic, University of, Oxford, Oxford, U. K. o. A., Bertolin, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci, F., Zuin Dipartimento di Fisica dell’ Universita, Infn, I., 35131 Padova, Italy f. J., Bulmahn, R. G., Feild31, B. Y., Oh, J. J., Whitmore Pennsylvania State University, University, Park, Pa, 16802, USA q. G., D’Agostini, G., Marini, A., Nigro Dipartimento di Fisica, ’La Sapienza’, U. n. i. v., I., 00185 Rome, Italy f. J. C., Hart, N. A., Mccubbin, T. P., Shah Rutherford Appleton Laboratory, Chilton, Didcot OX11, 0qx, U. K. o. E., Barberi, T., Dubb, C., Heusch, M., Van Hook, W., Lockman, J. T., Rahn, H. F. W., Sadrozinski, A., Seiden, D. C., Williams University of California, Santa, Cruz, Ca, 93106, USA p. J., Biltzinger, R. J., Seifert, O., Schwarzer, A. H., Walenta Fachbereich Physik der Universita¨t Gesamthochschule Siegen, D., 57012 Siegen, Germany c. H., Abramowicz, G., Briskin, S., Dagan32, T., Doeker32, A., Levy26 Raymond, Beverly Sackler Faculty of Exact, Science, School of, Physic, Tel Aviv, University, Tel Aviv, 69978, Israel e. J. I., Fleck33, M., Inuzuka, T., Ishii, M., Kuze, S., Mine, M., Nakao, I., Suzuki, K., Tokushuku, K., Umemori, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, 113, Japan g. M., Chiba, R., Hamatsu, T., Hirose, K., Homma, S., Kitamura34, T., Matsushita, K., Yamauchi Tokyo Metropolitan University, Tokyo 192, 03, Japan g. R., Cirio, M., Costa, M. I., Ferrero, S., Maselli, C., Peroni, R., Sacchi, A., Solano, A., Staiano Universita di Torino, Dipartimento di Fisica, Sperimentale, I., 10129 Torino, Italy f. M., Dardo II Faculty of Science, Torino, University, Infn, Alessandria, Italy f. D. C., Bailey, F., Benard, M., Brkic, C. P., Fagerstroem, G. F., Hartner, K. K., Joo, G. M., Levman, J. F., Martin, R. S., Orr, S., Polenz, C. R., Sampson, D., Simmon, R. J., Teuscher University of Toronto, Toronto, ON M5S, 1a7, Canada a. J. M., Butterworth, C. D., Catterall, T. W., Jone, P. B., Kaziewicz, J. B., Lane, R. L., Saunder, J., Shulman, M. R., Sutton University College London, London WC1E, 6bt, U. K. o. B., Lu, L. W., Mo Virginia Polytechnic Inst, State, University, Physics, Dept, Blacksburg, Va, 24061, USA q. W., Bogusz, J., Ciborowski, J., Gajewski, G., Grzelak35, M., Kasprzak, M., Krzyz˙anowski, K., Muchorowski36, R. J., Nowak, J. M., Pawlak, T., Tymieniecka, A. K., Wro´ blewski, J. A., Zakrzewski, A. F., Z˙ arnecki Warsaw University, Institute of Experimental, Physic, PL 00681, Warsaw, Poland j. M., Adamus Institute for Nuclear Studie, Poland j. C., Coldewey, Y., Eisenberg32, D., Hochman, U., Karshon32, D., Revel32, D., Zer Zion Weizmann Institute, Nuclear Physics, Dept, Rehovot, 76100, Israel d. W. F., Badgett, J., Breitweg, D., Chapin, R., Cro, S., Dasu, C., Fouda, R. J., Lovele, S., Mattingly, D. D., Reeder, S., Silverstein, W. H., Smith, A., Vaiciuli, M., Wodarczyk University of Wisconsin, Madison, Wi, 53706, USA p. S., Bhadra, M. L., Cardy37, W. R., Frisken, M., Khakzad, W. B., Schmidke York University, North, York, Toronto ON M3J, 1p3, and Canada, A.

Subjects
Physics::Instrumentation and Detectors, Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Cross sections of D* and J/Psi inelastic photoproduction were measured by the ZEUS detector at HERA collider. Comparisons of the data with calculations in NLO pQCD and SHA QCD approaches were made.

Published
1997

33. BEAM TESTS OF THE ZEUS BARREL CALORIMETER

Author

ZEUS Collaboration M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron Argonne National Laboratory, Argonne, IL, USA 47 F. Arzarello, R. Ayad l, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini 2, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, C. Del Papa, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, Q. Lin, B. Lisowski, G. Maccarrone, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, G. Sartorelli, R. Timellini, Y. Zamora Garcia l, A. Zichichi University, INFN Bologna, Bologna, Italy 39 A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, A. Frey, M. Geerts, G. Geitz, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H. P. Jakob, S. Kramarczyk, M. Kiickes 3, A. Mass, S. Mengel, J. Mollen, D. Monaldi4, H. Miisch 5, E. Paul, R. Schattevoy, J. L. Schneider, D. Schramm, R. Wedemeyer Physikalisches Institut der Universitiit Bonn, Bonn, Federal Republic of Germany 36 A. Cassidy, D. G. Cussans, N. Dyce, B. Foster, R. Gilmore, G. P. Heath, H. F. Heath, M. Lancaster, T. J. Llewellyn, J. Malos, C. J. S. Morgado, R. J. Tapper, S. S. Wilson, R. Yoshida H. H. Wills Physics Laboratory, University of Bristol, Bristol, UK 46 R. R. Rau Brookhaven National Laboratory, Upton, L. I., USA 47 M. Arneodo, M. Schioppa, G. Susinno Calabria University, Physics Department, INFN, Cosenza, Italy 39 A. Bernstein, A. Caldwell, I. Gialas, J. A. Parsons, S. Ritz, F. Sciulli 6, P. B. Straub, L. Wai, S. Yang Columbia University, Nevis Labs, Irvington on Hudson, USA 48 P. Borzemski, J. Chwastowski 7, A. Dwura~ny, A. Eskreys, Z. Jakubowski 8 B. Niziot, K. Piotrzkowski, M. Zachara, L. Zawiejski Institute of Nuclear Physics, Cracow, Poland 43 L. Adamczyk, B. Bednarek, K. Eskreys, K. Jelefi, D. Kisielewska, T. Kowalski, E. Rulikowska Zar~bska, L. Suszycki, J. Zaj0c Faculty of Physics, Nuclear T.e.c.h.n.i.q.u.e.s. Academy of Mining, Metallurgy, Cracow, Poland 43 T. Kgdzierski, A. Kotafiski, M. Przybyciefi Jagellonian University, Department of Physics, Poland 43 L. A. T. Bauerdick, U. Behrens, J. K. Bienlein, S. B6ttcher, C. Coldewey, A. Dannemann, G. Drews, P. Erhard 9, M. Flasifiski 10, I. Fleck, R. Gl~iser l. l, p. G6ttlicher, B. Gutjahr, T. Haas, L. Hagge, W. Hain, D. Hasell, H. Hultschig, G. Jahnen 12, p. Joos, M. Kasemann, R. Klanner, W. Koch, L. K6pke, U. K6tz, H. Kowalski, W. Kr6ger, J. Kriiger, J. Labs, A. Ladage, B. L6hr, M. L6we, D. Lfike, J. Mainusch, O. Manczak, M. Momayezi 13, J. S. T. Ng, S. Nickel, D. Notz, K. U. P6snecker 14, M. Rohde, J. Roldfin 15, E. Ros 7, U. Schneekloth, J. Schroeder, W. Schulz, F. Selonke, E. Stiliaris 15, E. Tscheslog 17, T. Tsurugai, W. Vogel 17, G. Wolf, C. Youngman Deutsches Elektronen Synchrotron DESE Hamburg, Federal Republic of Germany H. J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt DESY Zeuthen, Institut fiir Hochenergiephysik, Zeuthen, Federal Republic of Germany G. Barbagli, A. Francescato, M. Nuti, P. Pelfer University, INFN, Florence, Italy 39 G. Anzivino, R. Casaccia, S. De Pasquale, S. Qian, L. Votano INFN, Laboratori Nazionali di Frascati, Frascati, Italy 39 A. Bamberger, A. Freidhof, T. Poser, S. S61dner Rembold, G. Theisen, T. Trefzger Physikalisches Institut der Universitgit Freiburg, Freiburg, Federal Republic of Germany 36 N. H. Brook, P. J. Bussey, A. T. Doyle, J. R. Forbes, V. A. Jamieson, C. Raine, D. H. Saxon Department of Physics, Astronomy, University of Glasgow, Glasgow, UK 46 H. Brtickmann 18, G. Gloth, U. Holm, H. Kammerlocher, B. Krebs, T. Neumann, K. Wick Hamburg University, 1st Institute of Experimental Physics, Hamburg, Federal Republic of Germany 36 A. Fiirtjes, E. Lohrmann, J. Milewski 19, M. Nakahata 2°, N. Pavel, G. Poelz, W. Schott, J. Terron 15, F. Zetsche Hamburg U.n.i.v.e.r.s.i.t.y. Hnd Institute ofExperimental Physics, Federal Republic of Germany 36 T. C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V. L. Harris, D. B. Miller, A. Prinias, J. K. Sedgbeer, A. Vorvolakos, A. Whitfield Imperial College London, High Energy Nuclear Physics Group, London, UK 46 T. Bienz, H. Kreutzmann, U. Mallik, E. McCliment, M. Roco, M. Z. Wang University of lowa, Physics, Astronomy Department, Iowa City, USA 47 P. Cloth, D. Filges Forschungszentrum Jiilich, lnstitut fiir Kernphysik, J.i.i.l.i.c.h. Federal Republic of Germany S. H. An, S. M. Hong, C. O. Kim, T. Y. Kim, S. W. Nam, S. K. Park, M. H. Suh, S. H. Yon Korea University, Seou[, Korea 4] R. Imlay, S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla Louisiana State University, Department ~ Physics, Baton Rouge, USA 47 F. Barreiro 21, G. Cases, L. Herv~s 22, L. Labarga 22, j. del Peso, J. F. de Troc6niz 23 U.n.i.v.e.r. Aut6noma Madrid, Depto de Fisica Te6rlca, Madrid, Spain 45 F. Ikraiam, J. K. Mayer, G. R. Smith University of Manitoba, Winnipeg, Manitoba, Canada 34 F. Corriveau, D. J. Gilkinson, D. S. Hanna 6, j. Hartmann, L. W. Hung, J. N. Lira, R. Meijer Drees, J. W. Mitchell, P. M. Patel, L. E. Sinclair, D. G. Stairs, M. S.t. Laurent, R. Ullmann McGill University, Montreal, Quebec, Canada 34, 35 G. L. Bashindzhagyan, P. F. Ermolov, L. K. Gladilin, Y. A. Golubkov, V. A. Kuzmin, E. N. Kuznetsov, A. A. Savin, A. G. Voronin, N. P. Zotov Moscow State University, Institute of Nuclear Pysics, Moscow, Russia 44 S. Bentvelsen, M. Botje, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, H. van der Lugt, V. O'Dell, A. Tenner, H. Tiecke, H. Uijterwaa124, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg N1KHEF Amsterdam, Amsterdam, Netherlands 42 B. Bylsma, L. S. Durkin, K. Honscheid, C. Li, T. Y. Ling, K. W. McLean, W. N. Murray, I. H. Park, T. A. Romanowski 25 R. Seidlein Ohio State University, Columbus, OH, USA 47 G. A. Blair, A. Byrne, R. J. Cashmore, A. M. Cooper Sarkar, R. C. E. Devenish, D. M. Gingrich 26, P. M. Hallam Baker 7 N. Harnew, T. Khatri, K. R. Long, P. Luffman, 1. McArthur, P. Morawitz, J. Nash, S. J. P. Smith 27, N. C. Roocroft, F. F. Wilson Department of Physics, University of Oxford, Oxford, UK 46 G. Abbiendi, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, F. Gasparini, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci Dipartimento di Fisica dell Universita, INFN, Padova, ltaly 39 J. M. Butterworth, J. Bulmahn, G. Feild, B. Y. Oh 28, j. Whitmore 29 Pennsylvania State University, University Park, USA 48 U. Contino, G. D'Agostini, M. Guida 30, M. Iori, G. Marini, M. Mattioli, A. Nigro Dipartimento di Fisica, Universiffz 'La Sapienza, INFN, Rome, Italy 39 J. C. Hart, N. A. McCubbin, K. Prytz, T. P. Shah, T. L. Short Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK 46 E. Barberis, N. Cartiglia, C. Heusch, B. Hubbard, J. Leslie, W. Lockman, K. O'Shaughnessy, H. F. Sadrozinski, A. Seiden, D. Zer Zion University of California, Santa Cruz, USA 47 E. Badura, J. Biltzinger, R. J. Seifert, A. H. Walenta, G. Zech Fachbereich Physik der Universitgit Gesamthochschule Siegen, Siegen, Federal Republic of Germany 36 S. Dagan 31, A. Levy School of Physics, Tel Aviv University, Tel Aviv, Israel 38 T. Hasegawa, M. Hazumi, T. Ishii, S. Kasai 32, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, H. Okuno, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki Institute for Nuclear Study, University of Tokyo, Tokyo, Japan 4° M. Chiba, R. Hamatsu, T. Hirose, S. Kitamura, S. Nagayama, Y. Nakamitsu Tokyo Metropolitan University, Japan 4° R. Cirio, M. Costa, M. I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, A. Solano, A. Staiano Universith di Torino, Dipartimento di Fisica Sperimentale, INFN, Torino, Italy 39 M. Dardo Facultd di Scienze, University of Torino, Alessandria, INFN Sezione di Torino, Torino, Italy 39 D. C. Bailey, D. Bandyopadhyay, F. Benard, S. Bhadra, M. Brkic, B. D. Burow, F. S. Chlebana, M. B. Crombie, G. F. Hartner, G. M. Levman, J. F. Martin, R. S. Orr, J. D. Prentice, C. R. Sampson, G. G. Stairs, R. J. Teuscher, T. S. Yoon University of Toronto, Toronto, O.n.t., Canada 34 F. W. Bullock, C. D. Catterall, J. C. Giddings, T. W. Jones, A. M. Khan, J. B. Lane, P. L. Makkar, D. Shaw, J. Shulman University College London, UK 46 K. Blankenship, J. Kochocki, B. Lu, L. W. Mo Virginia Polytechnic Institute, State University, Blacksburg, VA, USA 48 K. Charchuta, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyzanowski, K. Muchorowski, R. J. Nowak, J. M. Pawlak, A. Stopczyfiski, T. Tymieniecka, R. Walczak, A. K. Wr6blewski, J. A. Zakrzewski, A. F. Zarnecki Warsaw University, Institute of Experimental Physics, Warsaw, Poland 43 M. Adamus Institute for Nuclear Studies, Poland 43 H. Abramowicz 19, y. Eisenberg, C. Glasman 33, U. Karshon 31, A. Montag 3J, D. Revel, A. Shapira Weizmann Institute, Nuclear Physics Department, Rehovot, Israel 37 C. Foudas, C. Fordham, R. J. Loveless, A. Goussiou, I. Ali, B. Behrens, S. Dasu, D. D. Reeder, W. H. Smith, S. Silverstein University of Wisconsin, Madison, W1, USA 47 W. R. Frisken, K. M. Furutani, Y. Iga York University, North York, O.n.t., MARI, Stefano Maria, ZEUS Collaboration M., Derrick, D., Krakauer, S., Magill, B., Musgrave, J., Repond, S., Repond, R., Stanek, R. L., Talaga, J., Thron Argonne National Laboratory, Argonne, Il, USA 47 F., Arzarello, R., Ayad l, G., Bari, M., Basile, L., Bellagamba, D., Boscherini, A., Bruni, G., Bruni, P., Bruni, G., Cara Romeo, G., Castellini 2, M., Chiarini, L., Cifarelli, F., Cindolo, F., Ciralli, A., Contin, S., D'Auria, C., Del Papa, F., Frasconi, P., Giusti, G., Iacobucci, G., Laurenti, G., Levi, Q., Lin, B., Lisowski, G., Maccarrone, A., Margotti, T., Massam, R., Nania, C., Nemoz, F., Palmonari, G., Sartorelli, R., Timellini, Y., Zamora Garcia l, A., Zichichi University, Infn, Bologna, Bologna, Italy 39 A., Bargende, J., Crittenden, K., Desch, B., Diekmann, T., Doeker, A., Frey, M., Geert, G., Geitz, H., Hartmann, D., Haun, K., Heinloth, E., Hilger, H. P., Jakob, S., Kramarczyk, M., Kiickes 3, A., Ma, S., Mengel, J., Mollen, D., Monaldi4, H., Miisch 5, E., Paul, R., Schattevoy, J. L., Schneider, D., Schramm, R., Wedemeyer Physikalisches Institut der Universitiit Bonn, Bonn, Federal Republic of Germany 36 A., Cassidy, D. G., Cussan, N., Dyce, B., Foster, R., Gilmore, G. P., Heath, H. F., Heath, M., Lancaster, T. J., Llewellyn, J., Malo, C. J. S., Morgado, R. J., Tapper, S. S., Wilson, R. Yoshida H. H., Wills Physics Laboratory, University of, Bristol, Bristol, UK 46 R. R., Rau Brookhaven National Laboratory, Upton, L. I., Ny, USA 47 M., Arneodo, M., Schioppa, G., Susinno Calabria University, Physics, Department, Infn, Cosenza, Italy 39 A., Bernstein, A., Caldwell, I., Giala, J. A., Parson, S., Ritz, F., Sciulli 6, P. B., Straub, L., Wai, S., Yang Columbia University, Nevis, Lab, Irvington on, Hudson, USA 48 P., Borzemski, J., Chwastowski 7, A., Dwura~ny, A., Eskrey, Z. Jakubowski 8 B., Niziot, K., Piotrzkowski, M., Zachara, L., Zawiejski Institute of Nuclear Physic, Cracow, Poland 43 L., Adamczyk, B., Bednarek, K., Eskrey, K., Jelefi, D., Kisielewska, T., Kowalski, E., Rulikowska Zar~bska, L., Suszycki, J., Zaj0c Faculty of Physic, Academy of Mining, Nuclear T. e. c. h. n. i. q. u. e. s., Metallurgy, Cracow, Poland 43 T., Kgdzierski, A., Kotafiski, M., Przybyciefi Jagellonian University, Department of, Physic, Poland 43 L. A. T., Bauerdick, U., Behren, J. K., Bienlein, S., B6ttcher, C., Coldewey, A., Dannemann, G., Drew, P., Erhard 9, M., Flasifiski 10, I., Fleck, R. Gl~iser l., L, P., G6ttlicher, B., Gutjahr, T., Haa, L., Hagge, W., Hain, D., Hasell, H., Hultschig, G., Jahnen 12, P., Joo, M., Kasemann, R., Klanner, W., Koch, L., K6pke, U., K6tz, H., Kowalski, W., Kr6ger, J., Kriiger, J., Lab, A., Ladage, B., L6hr, M., L6we, D., Lfike, J., Mainusch, O., Manczak, M., Momayezi 13, J. S. T., Ng, S., Nickel, D., Notz, K. U., P6snecker 14, M., Rohde, J., Roldfin 15, E., Ros 7, U., Schneekloth, J., Schroeder, W., Schulz, F., Selonke, E., Stiliaris 15, E., Tscheslog 17, T., Tsurugai, W., Vogel 17, G., Wolf, C., Youngman Deutsches Elektronen Synchrotron DESE Hamburg, Federal Republic of Germany H. J., Grabosch, A., Leich, A., Meyer, C., Rethfeldt, S., Schlenstedt DESY Zeuthen, Institut fiir, Hochenergiephysik, Zeuthen, Federal Republic of Germany G., Barbagli, A., Francescato, M., Nuti, P., Pelfer University, Infn, Florence, Italy 39 G., Anzivino, R., Casaccia, S., De Pasquale, S., Qian, L., Votano INFN, Laboratori Nazionali di, Frascati, Frascati, Italy 39 A., Bamberger, A., Freidhof, T., Poser, S., S61dner Rembold, G., Theisen, T., Trefzger Physikalisches Institut der Universitgit Freiburg, Freiburg, Federal Republic of Germany 36 N. H., Brook, P. J., Bussey, A. T., Doyle, J. R., Forbe, V. A., Jamieson, C., Raine, D. H., Saxon Department of Physic, Astronomy, University of, Glasgow, Glasgow, UK 46 H., Brtickmann 18, G., Gloth, U., Holm, H., Kammerlocher, B., Kreb, T., Neumann, K., Wick Hamburg University, 1st Institute of Experimental, Physic, Hamburg, Federal Republic of Germany 36 A., Fiirtje, E., Lohrmann, J., Milewski 19, M., Nakahata 2°, N., Pavel, G., Poelz, W., Schott, J., Terron 15, Hnd Institute ofExperimental Physics, F. Zetsche Hamburg U. n. i. v. e. r. s. i. t. y., Federal Republic of Germany 36 T. C., Bacon, R., Beuselinck, I., Butterworth, E., Gallo, V. L., Harri, D. B., Miller, A., Prinia, J. K., Sedgbeer, A., Vorvolako, A., Whitfield Imperial College London, High Energy Nuclear Physics, Group, London, UK 46 T., Bienz, H., Kreutzmann, U., Mallik, E., Mccliment, M., Roco, M. Z., Wang University of lowa, Physics, Astronomy, Department, Iowa, City, USA 47 P., Cloth, D., Filges Forschungszentrum Jiilich, lnstitut fiir, Kernphysik, J. i. i. l. i. c. h. Federal Republic of Germany S. H., An, S. M., Hong, C. O., Kim, T. Y., Kim, S. W., Nam, S. K., Park, M. H., Suh, S. H., Yon Korea University, Seou[, Korea 4] R., Imlay, S., Kartik, H. J., Kim, R. R., Mcneil, W., Metcalf, V. K., Nadendla Louisiana State University, Department, ~ Physic, Baton, Rouge, La, USA 47 F., Barreiro 21, G., Case, L., Herv~s 22, L., Labarga 22, J., del Peso, Aut6noma Madrid, J. F. de Troc6niz 23 U. n. i. v. e. r., Depto de Fisica, Te6rlca, Madrid, Spain 45 F., Ikraiam, J. K., Mayer, G. R., Smith University of Manitoba, Winnipeg, Manitoba, Canada 34 F., Corriveau, D. J., Gilkinson, D. S., Hanna 6, J., Hartmann, L. W., Hung, J. N., Lira, R., Meijer Dree, J. W., Mitchell, P. M., Patel, L. E., Sinclair, D. G., Stair, Laurent, M. S. t., R., Ullmann McGill University, Montreal, Quebec, Canada, 34, 35 G. L., Bashindzhagyan, P. F., Ermolov, L. K., Gladilin, Y. A., Golubkov, V. A., Kuzmin, E. N., Kuznetsov, A. A., Savin, A. G., Voronin, N. P., Zotov Moscow State University, Institute of Nuclear, Pysic, Moscow, Russia 44 S., Bentvelsen, M., Botje, A., Dake, J., Engelen, P., de Jong, M., de Kamp, P., Kooijman, A., Kruse, H., van der Lugt, V., O'Dell, A., Tenner, H., Tiecke, H., Uijterwaa124, M., Vreeswijk, L., Wigger, E., de Wolf, R., van Woudenberg N1KHEF Amsterdam, Amsterdam, Netherlands 42 B., Bylsma, L. S., Durkin, K., Honscheid, C., Li, T. Y., Ling, K. W., Mclean, W. N., Murray, I. H., Park, T. A. Romanowski 25 R., Seidlein Ohio State University, Columbus, Oh, USA 47 G. A., Blair, A., Byrne, R. J., Cashmore, A. M., Cooper Sarkar, R. C. E., Devenish, D. M., Gingrich 26, P. M. Hallam Baker 7 N., Harnew, T., Khatri, K. R., Long, P., Luffman, 1., Mcarthur, P., Morawitz, J., Nash, S. J. P., Smith 27, N. C., Roocroft, F. F., Wilson Department of Physic, University of, Oxford, Oxford, UK 46 G., Abbiendi, R., Brugnera, R., Carlin, F., Dal Corso, M., De Giorgi, U., Dosselli, F., Gasparini, S., Limentani, M., Morandin, M., Posocco, L., Stanco, R., Stroili, C., Voci Dipartimento di Fisica dell Universita, Infn, Padova, ltaly 39 J. M., Butterworth, J., Bulmahn, G., Feild, B. Y., Oh 28, J., Whitmore 29 Pennsylvania State University, University, Park, Pa, USA 48 U., Contino, G., D'Agostini, M., Guida 30, M., Iori, Mari, Stefano Maria, G., Marini, M., Mattioli, A., Nigro Dipartimento di Fisica, Universiffz 'La, Sapienza, Infn, Rome, Italy 39 J. C., Hart, N. A., Mccubbin, K., Prytz, T. P., Shah, T. L., Short Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK 46 E., Barberi, N., Cartiglia, C., Heusch, B., Hubbard, J., Leslie, W., Lockman, K., O'Shaughnessy, H. F., Sadrozinski, A., Seiden, D., Zer Zion University of California, Santa, Cruz, Ca, USA 47 E., Badura, J., Biltzinger, R. J., Seifert, A. H., Walenta, G., Zech Fachbereich Physik der Universitgit Gesamthochschule Siegen, Siegen, Federal Republic of Germany 36 S., Dagan 31, A., Levy School of Physic, Tel Aviv, University, Tel, Aviv, Israel 38 T., Hasegawa, M., Hazumi, T., Ishii, S., Kasai 32, M., Kuze, S., Mine, Y., Nagasawa, T., Nagira, M., Nakao, H., Okuno, I., Suzuki, K., Tokushuku, S., Yamada, Y., Yamazaki Institute for Nuclear Study, University of, Tokyo, Tokyo, Japan 4° M., Chiba, R., Hamatsu, T., Hirose, S., Kitamura, S., Nagayama, Y., Nakamitsu Tokyo Metropolitan University, Japan 4° R., Cirio, M., Costa, M. I., Ferrero, L., Lamberti, S., Maselli, C., Peroni, A., Solano, A., Staiano Universith di Torino, Dipartimento di Fisica, Sperimentale, Infn, Torino, Italy 39 M., Dardo Facultd di Scienze, University of, Torino, Alessandria, INFN Sezione di, Torino, Torino, Italy 39 D. C., Bailey, D., Bandyopadhyay, F., Benard, S., Bhadra, M., Brkic, B. D., Burow, F. S., Chlebana, M. B., Crombie, G. F., Hartner, G. M., Levman, J. F., Martin, R. S., Orr, J. D., Prentice, C. R., Sampson, G. G., Stair, R. J., Teuscher, T. S., Yoon University of Toronto, Toronto, O. n. t., Canada 34 F. W., Bullock, C. D., Catterall, J. C., Gidding, T. W., Jone, A. M., Khan, J. B., Lane, P. L., Makkar, D., Shaw, J., Shulman University College London, UK 46 K., Blankenship, J., Kochocki, B., Lu, L. W., Mo Virginia Polytechnic Institute, State, University, Blacksburg, Va, USA 48 K., Charchuta, J., Ciborowski, J., Gajewski, G., Grzelak, M., Kasprzak, M., Krzyzanowski, K., Muchorowski, R. J., Nowak, J. M., Pawlak, A., Stopczyfiski, T., Tymieniecka, R., Walczak, A. K., Wr6blewski, J. A., Zakrzewski, A. F., Zarnecki Warsaw University, Institute of Experimental, Physic, Warsaw, Poland 43 M., Adamus Institute for Nuclear Studie, Poland 43 H., Abramowicz 19, Y., Eisenberg, C., Glasman 33, U., Karshon 31, A., Montag 3J, D., Revel, A., Shapira Weizmann Institute, Nuclear Physics, Department, Rehovot, Israel 37 C., Fouda, C., Fordham, R. J., Lovele, A., Goussiou, I., Ali, B., Behren, S., Dasu, D. D., Reeder, W. H., Smith, S., Silverstein University of Wisconsin, Madison, W1, USA 47 W. R., Frisken, K. M., Furutani, Y., Iga York University, North, York, and O. n., T.

Subjects
Physics, Nuclear and High Energy Physics, ZEUS (particle detector), Spectrometer, Physics::Instrumentation and Detectors, DESY, HERA, Particle detector, Calorimeter, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Instrumentation, Beam (structure)
Abstract

A fully compensating uranium—scintillator calorimeter was constructed for the ZEUS detector at HERA. Several of the barrel calorimeter modules were subjected to beam tests at Fermilab before shipping them to DESY for installation. The calibrations of the modules used beams of electrons and hadrons, measuring the uniformity of the response, and checking the resolution. The runs also provided opportunity to test a large fraction of the actual ZEUS calorimeter readout system in an integrated beam environment more than one year before HERA turn on. The experiment utilized two computer controlled mechanical structures, one of which was capable of holding up to four modules in order to study shower containment, and a magnetic spectrometer with a high resolution beam tracking system. During two running periods, beams of 6 to 110 GeV containing e, μ, π, and p were used. The results show energy resolutions of 35%/ E for hadrons and 19%/ E for electrons, uniformities at the 1% level, energy nonlinearity less than 1%, and equal response for electrons and hadrons.

Published
1993

34. Task allocation algorithms for maximizing reliability of distributed computing systems

Author

C. Siva Ram Murthy and S. Kartik

Subjects
Branch and bound, Computational complexity theory, Computer science, Heuristic (computer science), Reliability (computer networking), Distributed computing, Search tree, Theoretical Computer Science, Task (project management), Reduction (complexity), Computational Theory and Mathematics, Hardware and Architecture, Resource allocation, Resource allocation (computer), Heuristics, Algorithm, Software
Abstract

In this paper, we consider the problem of finding an optimal and suboptimal task allocation (i.e., to which processor should each module of a task or program be assigned) in distributed computing systems with the goal of maximizing the system reliability (i.e., the probability that the system can run the entire task successfully). The problem of finding an optimal task allocation is known to be NP-hard in the strong sense. Here we present an algorithm for this problem, which uses the idea of branch and bound with underestimates for reducing the computations in finding an optimal task allocation. The algorithm reorders the list of modules to allow a subset of modules that do not communicate with one another to be assigned last, for further reduction in the computations of optimal task allocation for maximizing reliability. We also present a heuristic algorithm which obtains suboptimal task allocations in a reasonable amount of computational time. We study the performance of the algorithms over a wide range of parameters such as the number of modules, the number of processors, the ratio of average execution cost to average communication cost, and the connectivity of modules. We demonstrate the effectiveness of our algorithms by comparing with recent competing task allocation algorithms for maximizing reliability available in the literature. ? 1997 IEEE.

Published
1997

35. Measurement of elastic $\phi$ photoproduction at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J.R. Okrasinski, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, M.C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, A. Bornheim, J. Crittenden, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, J. Mollen, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, T. Monteiro, J.S.T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, T. Voß, D. Westphal, G. Wolf, C. Youngman, W. Zeuner, H.J. Grabosch, A. Kharchilava, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, T. Trefzger, S. Wölfle, J.T. Bromley, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, L.E. Sinclair, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, R. Sinkus, K. Wick, B.D. Burow, L. Hagge, E. Lohrmann, J. Milewski, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Brümmer, I. Butterworth, V.L. Harris, G. Howell, B.H.Y. Hung, L. Lamberti, K.R. Long, D.B. Miller, A. Prinias, J.K. Sedgbeer, D. Sideris, A.F. Whitfield, U. Mallik, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, G.H. Cho, B.J. Ko, S.B. Lee, S.W. Nam, H.S. Park, S.K. Park, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, M. Riveline, D.G. Stairs, M. St-Laurent, R. Ullmann, G. Zacek, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C. Li, T.Y. Ling, P. Nylander, I.H. Park, T.A. Romanowski, D.S. Bailey, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin, J. Bulmahn, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, T.P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, J.I. Fleck, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, F. Benard, M. Brkic, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, D. Simmons, R.J. Teuscher, J.M. Butterworth, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, M.R. Sutton, B. Lu, L.W. Mo, W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, C. Coldewey, Y. Eisenberg, U. Karshon, D. Revel, D. Zer-Zion, W.F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R.J. Loveless, S. Mattingly, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, M.L. Cardy, C.-P. Fagerstroem, W.R. Frisken, M. Khakzad, W.N. Murray, W.B. Schmidke, and ZEUS at HERA (IHEF, IoP, FNWI)

Subjects
Diffraction, Nuclear and High Energy Physics, Particle physics, Meson, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, PHYSICS, Cross section (physics), DESIGN, 0103 physical sciences, 010306 general physics, DETECTOR, ZEUS, ZEUS BARREL CALORIMETER, CONSTRUCTION, Physics, Range (particle radiation), ZEUS (particle detector), 010308 nuclear & particles physics, HERA, Helicity, Exponential function, High Energy Physics::Experiment
Abstract

The production of $\phi$ mesons in the reaction $e^{+}p \rightarrow e^{+} \phi p$ ($\phi \rightarrow K^{+}K^{-}$) at a median $Q^{2}$ of $10^{-4} \ \rm{GeV^2}$ has been studied with the ZEUS detector at HERA. The differential $\phi$ photoproduction cross section $d\sigma/dt$ has an exponential shape and has been determined in the kinematic range $0.1, Comment: 23 pages, including 6 post script figures

Published
1996

36. Rapidity gaps between jets in photoproduction at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bornheim, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, J. Mollen, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, C.J.S. Morgado, J.A. O'Mara, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, R.R. Rau, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, N. Cartiglia, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, C. Coldewey, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Groß-Knetter, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, T. Monteiro, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, B. Surrow, T. Voß, D. Westphal, G. Wolf, C. Youngman, W. Zeuner, J.F. Zhou, H.J. Grabosch, A. Kharchilava, A. Leich, S.M. Mari, M.C.K. Mattingly, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, A. Freidhof, S. Söldner-Rembold, J. Schroeder, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, L. Hagge, E. Lohrmann, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Bruemmer, I. Butterworth, V.L. Harris, B.Y.H. Hung, K.R. Long, D.B. Miller, P.P.O. Morawitz, A. Prinias, J.K. Sedgbeer, A.F. Whitfield, U. Mallik, E. McCliment, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.V. Nam, S.K. Park, M.H. Suh, S.H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, G.R. Smith, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, L.E. Sinclair, D.G. Stairs, M. St.Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, A. Dake, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, P. Nylander, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, A. Byrne, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.R. Okrasinski, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, C. Händel-Pikielny, A. Levy, J.I. Fleck, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, Y. Nakamitsu, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, R.J. Teuscher, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, K. Blankenship, B. Lu, L.W. Mo, W. Bogusz, K. Charchuła, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, Y. Eisenberg, U. Karshon, D. Revel, D. Zer-Zion, I. Ali, W.F. Badgett, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, T. Tsurugai, S. Bhadra, M.L. Cardy, C.-P. Fagerstroem, W.R. Frisken, K.M. Furutani, M. Khakzad, W.N. Murray, W.B. Schmidke, and ZEUS at HERA (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, COLLISIONS, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, EVENTS, High Energy Physics - Experiment (hep-ex), MONTE-CARLO, DESIGN, 0103 physical sciences, Rapidity, 010306 general physics, Nuclear Experiment, Physics, Research Groups and Centres\Physics\Low Temperature Physics, ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, Faculty of Science\Physics, ZEUS, PARTON ELASTIC-SCATTERING, ZEUS BARREL CALORIMETER, HERA, diffractive scattering, photoproduction, High Energy Physics::Experiment
Abstract

Photoproduction events which have two or more jets have been studied in the $W_{\gamma p}$ range 135~GeV $< W_{\gamma p}, Comment: 19 pages, latex, 3 figures appended as uuencoded file. Author list corrected

Published
1996

37. Measurement of Alpha(s) From Jet Rates In Deep-inelastic Scattering At Hera

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, A. Polini, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, A. Bornheim, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, J. Mollen, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, C.J.S. Morgado, J.A. O'Mara, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, R.R. Rau, M. Arneodo, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, N. Cartiglia, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, A. Kotański, M. Przybycień, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, C. Coldewey, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, B. Gutjahr, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, T. Monteiro, J.S.T. Ng, S. Nickel, D. Notz, K. Ohrenberg, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, E. Stiliaris, B. Surrow, T. Voß, D. Westphal, G. Wolf, C. Youngman, W. Zeuner, J.F. Zhou, H.J. Grabosch, A. Kharchilava, A. Leich, M.C.K. Mattingly, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, P. Pelfer, G. Anzivino, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, A. Freidhof, S. Söldner-Rembold, J. Schroeder, T. Trefzger, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, T. Neumann, R. Sinkus, K. Wick, E. Badura, B.D. Burow, L. Hagge, E. Lohrmann, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Bruemmer, I. Butterworth, E. Gallo, V.L. Harris, B.Y.H. Hung, K.R. Long, D.B. Miller, P.P.O. Morawitz, A. Prinias, J.K. Sedgbeer, A.F. Whitfield, U. Mallik, E. McCliment, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, S.M. Hong, S.W. Nam, S.K. Park, M.H. Suh, S.H. Yon, R. Imlay, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, G. Cases, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, G.R. Smith, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, L.E. Sinclair, D.G. Stairs, M. St.Laurent, R. Ullmann, G. Zacek, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, A. Dake, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, H. Tiecke, W. Verkerke, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, K. Honscheid, C. Li, T.Y. Ling, K.W. McLean, W.N. Murray, P. Nylander, I.H. Park, T.A. Romanowski, R. Seidlein, D.S. Bailey, A. Byrne, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J.M. Butterworth, R.G. Feild, B.Y. Oh, J.R. Okrasinski, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, K. Prytz, T.P. Shah, T.L. Short, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, C. Händel-Pikielny, A. Levy, J.I. Fleck, T. Hasegawa, M. Hazumi, T. Ishii, M. Kuze, S. Mine, Y. Nagasawa, M. Nakao, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, Y. Nakamitsu, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, D. Bandyopadhyay, F. Benard, M. Brkic, D.M. Gingrich, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, R.J. Teuscher, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, K. Blankenship, B. Lu, L.W. Mo, W. Bogusz, K. Charchuła, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, Y. Eisenberg, U. Karshon, D. Revel, D. Zer-Zion, I. Ali, W.F. Badgett, B. Behrens, S. Dasu, C. Fordham, C. Foudas, A. Goussiou, R.J. Loveless, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, T. Tsurugai, S. Bhadra, M.L. Cardy, C.-P. Fagerstroem, W.R. Frisken, K.M. Furutani, M. Khakzad, and W.B. Schmidke

Subjects
Nuclear and High Energy Physics, Particle physics, jet production, ENERGIES, Astrophysics::High Energy Astrophysical Phenomena, Parton, PROTON SCATTERING, 01 natural sciences, perturbative QCD, High Energy Physics - Experiment, CROSS-SECTIONS, Nuclear physics, EVENT GENERATOR, MONTE-CARLO, QCD JETS, ZEUS, CALORIMETER, FRAGMENTATION, DEPENDENCE, 0103 physical sciences, determination of alpha_s, 010306 general physics, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, HERA, Deep inelastic scattering, High Energy Physics::Experiment
Abstract

Jet production in deep inelastic scattering for $120, Comment: 22 pages, latex, 4 figures appended as uuencoded file

Published
1995

38. Measurement of the Cross-section For the Reaction Gamma-p-]j/psi-p With the Zeus Detector At Hera

Author

M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, R.L Talaga, H Zhang, R Ayad, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, P Bruni, G Cara Romeo, G Castellini, M Chiarini, L Cifarelli, F Cindolo, A Contin, M Corradi, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, C Nemoz, F Palmonari, A Polini, G Sartorelli, R Timellini, Y Zamora Garcia, A Zichichi, A Bargende, J Crittenden, K Desch, B Diekmann, T Doeker, M Eckert, L Feld, A Frey, M Geerts, G Geitz, M Grothe, T Haas, H Hartmann, D Haun, K Heinloth, E Hilger, H.-P Jakob, U.F Katz, S.M Mari, A Mass, S Mengel, J Mollen, E Paul, Ch Rembser, R Schattevoy, D Schramm, J Stamm, R Wedemeyer, S Campbell-Robson, A Cassidy, N Dyce, B Foster, S George, R Gilmore, G.P Heath, H.F Heath, T.J Llewellyn, C.J.S Morgado, D.J.P Norman, J.A O'Mara, R.J Tapper, S.S Wilson, R Yoshida, R.R Rau, M Arneodo, L Iannotti, M Schioppa, G Susinno, A Bernstein, A Caldwell, N Cartiglia, J.A Parsons, S Ritz, F Sciulli, P.B Straub, L Wai, S Yang, Q Zhu, P Borzemski, J Chwastowski, A Eskreys, K Piotrzkowski, M Zachara, L Zawiejski, L Adamczyk, B Bednarek, K Jeleń, D Kisielewska, T Kowalski, E Rulikowska-Zarȩbska, L Suszycki, J Zaja̧c, A Kotański, M Przybycień, L.A.T Bauerdick, U Behrens, H Beier, J.K Bienlein, C Coldewey, O Deppe, K Desler, G Drews, M Flasiński, D.J Gilkinson, C Glasman, P Göttlicher, J Große-Knetter, B Gutjahr, W Hain, D Hasell, H Heßling, Y Iga, P Joos, M Kasemann, R Klanner, W Koch, L Köpke, U Kötz, H Kowalski, J Labs, A Ladage, B Löhr, M Löwe, D Lüke, O Mańczak, T Monteiro, J.S.T Ng, S Nickel, D Notz, K Ohrenberg, M Roco, M Rohde, J Roldán, U Schneekloth, W Schulz, F Selonke, E Stiliaris, B Surrow, T Voß, D Westphal, G Wolf, C Youngman, J.F Zhou, H.J Grabosch, A Kharchilava, A Leich, M.C.K Mattingly, A Meyer, S Schlenstedt, N Wulff, G Barbagli, P Pelfer, G Anzivino, G Maccarrone, S De Pasquale, L Votano, A Bamberger, S Eisenhardt, A Freidhof, S Söldner-Rembold, J Schroeder, T Trefzger, N.H Brook, P.J Bussey, A.T Doyle, J.I Fleck, D.H Saxon, M.L Utley, A.S Wilson, A Dannemann, U Holm, D Horstmann, T Neumann, R Sinkus, K Wick, E Badura, B.D Burow, L Hagge, E Lohrmann, J Mainusch, J Milewski, M Nakahata, N Pavel, G Poelz, W Schott, F Zetsche, T.C Bacon, I Butterworth, E Gallo, V.L Harris, B.Y.H Hung, K.R Long, D.B Miller, P.P.O Morawitz, A Prinias, J.K Sedgbeer, A.F Whitfield, U Mallik, E McCliment, M.Z Wang, S.M Wang, J.T Wu, Y Zhang, P Cloth, D Filges, S.H An, S.M Hong, S.W Nam, S.K Park, M.H Suh, S.H Yon, R Imlay, S Kartik, H.-J Kim, R.R McNeil, W Metcalf, V.K Nadendla, F Barreiro, G Cases, R Graciani, J.M Hernández, L Hervás, L Labarga, J del Peso, J Puga, J Terron, J.F de Trocóniz, G.R Smith, F Corriveau, D.S Hanna, J Hartmann, L.W Hung, J.N Lim, C.G Matthews, P.M Patel, L.E Sinclair, D.G Stairs, M St.Laurent, R Ullmann, G Zacek, V Bashkirov, B.A Dolgoshein, A Stifutkin, G.L Bashindzhagyan, P.F Ermolov, L.K Gladilin, Y.A Golubkov, V.D Kobrin, V.A Kuzmin, A.S Proskuryakov, A.A Savin, L.M Shcheglova, A.N Solomin, N.P Zotov, M Botje, F Chlebana, A Dake, J Engelen, M de Kamps, P Kooijman, A Kruse, H Tiecke, W Verkerke, M Vreeswijk, L Wiggers, E de Wolf, R van Woudenberg, D Acosta, B Bylsma, L.S Durkin, K Honscheid, C Li, T.Y Ling, K.W McLean, W.N Murray, I.H Park, T.A Romanowski, R Seidlein, D.S Bailey, G.A Blair, A Byrne, R.J Cashmore, A.M Cooper-Sarkar, D Daniels, R.C.E Devenish, N Harnew, M Lancaster, P.E Luffman, L Lindemann, J.D McFall, C Nath, V.A Noyes, A Quadt, H Uijterwaal, R Walczak, F.F Wilson, T Yip, G Abbiendi, A Bertolin, R Brugnera, R Carlin, F Dal Corso, M De Giorgi, U Dosselli, S Limentani, M Morandin, M Posocco, L Stanco, R Stroili, C Voci, J Bulmahn, J.M Butterworth, R.G Feild, B.Y Oh, J.J Whitmore, G D'Agostini, G Marini, A Nigro, E Tassi, J.C Hart, N.A McCubbin, K Prytz, T.P Shah, T.L Short, E Barberis, T Dubbs, C Heusch, M Van Hook, B Hubbard, W Lockman, J.T Rahn, H.F.-W Sadrozinski, A Seiden, J Biltzinger, R.J Seifert, A.H Walenta, G Zech, H Abramowicz, G Briskin, S Dagan, A Levy, T Hasegawa, M Hazumi, T Ishii, M Kuze, S Mine, Y Nagasawa, M Nakao, I Suzuki, K Tokushuku, S Yamada, Y Yamazaki, M Chiba, R Hamatsu, T Hirose, K Homma, S Kitamura, Y Nakamitsu, K Yamauchi, R Cirio, M Costa, M.I Ferrero, L Lamberti, S Maselli, C Peroni, R Sacchi, A Solano, A Staiano, M Dardo, D.C Bailey, D Bandyopadhyay, F Benard, M Brkic, M.B Crombie, D.M Gingrich, G.F Hartner, K.K Joo, G.M Levman, J.F Martin, R.S Orr, C.R Sampson, R.J Teuscher, C.D Catterall, T.W Jones, P.B Kaziewicz, J.B Lane, R.L Saunders, J Shulman, K Blankenship, B Lu, L.W Mo, W Bogusz, K Charchuła, J Ciborowski, J Gajewski, G Grzelak, M Kasprzak, M Krzyżanowski, K Muchorowski, R.J Nowak, J.M Pawlak, T Tymieniecka, A.K Wróblewski, J.A Zakrzewski, A.F Żarnecki, M Adamus, Y Eisenberg, U Karshon, D Revel, D Zer-Zion, I Ali, W.F Badgett, B Behrens, S Dasu, C Fordham, C Foudas, A Goussiou, R.J Loveless, D.D Reeder, S Silverstein, W.H Smith, A Vaiciulis, M Wodarczyk, T Tsurugai, S Bhadra, M.L Cardy, C.-P Fagerstroem, W.R Frisken, K.M Furutani, M Khakzad, and W.B Schmidke

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, LUND MONTE-CARLO, ZEUS, ELASTIC-SCATTERING, BARREL CALORIMETER, PHOTOPRODUCTION, J/PSI, DESIGN, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, Cross section (physics), 0103 physical sciences, photoproduction, J/ψ cross section measurement, 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, Elastic scattering, ZEUS (particle detector), Luminosity (scattering theory), 010308 nuclear & particles physics, HERA, Gluon, High Energy Physics::Experiment
Abstract

This paper reports the cross section measurements for the process ep $\rightarrow$ e~\jpsi~p for $Q^2 < 4$ GeV$^2$ at $\sqrt s = 296$ GeV, based on an integrated luminosity of about 0.5~pb$^{-1}$, using the ZEUS detector. The \jpsi~was detected in its $\rm e^{+}e^{-}$ and $\rm \mu^{+}\mu^{-}$ decay modes. The photoproduction cross section was measured to be $52^{ \ +7}_{-12}\pm 10$~nb at an average $\gamma$p centre of mass energy of 67 GeV and $71^{+13}_{-20}\pm 12$~nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low $x$ in the proton is assumed., Comment: 21 pages, latex, 4 figures appended as uuencoded file

Published
1995

39. Measurement of Multiplicity and Momentum Spectra In the Current Fragmentation Region of the Breit Frame At Hera

Author

H.G.J.M. Tiecke, D. Haun, F. Benard, S. Kartik, K. Desler, E. McCliment, Nicolo Cartiglia, Mariusz Przybycien, I. Fleck, S. Yang, A. Seiden, Francois Corriveau, S. Campbell-Robson, R.S. Gilmore, D. J. Gilkinson, H.J. Grabosch, A. Meyer, Matthias Kasemann, K. M. Furutani, D. Notz, S. H. Yon, T. W. Jones, Anna Goussiou, G. L. Bashindzhagyan, N. P. Zotov, W.B. Schmidke, R. J. Teuscher, A. Kotański, W. Metcalf, I. H. Park, Ben Bylsma, J. Milewski, O. Deppe, J. F. Martin, H. Hartmann, Jose M Hernandez, Sridhara Dasu, Halina Abramowicz, G. Lacobucci, S.S. Wilson, A. Eskreys, A. T. Doyle, L. Labarga, B. Surrow, N. Pavel, I. Suzuki, R. Yoshida, Marcel Vreeswijk, T. Yip, Hartmut Sadrozinski, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, Wouter Verkerke, Thomas Trefzger, R. Schattevoy, J.B. Lane, Rr Rau, L. Köpke, T. Voß, U. Holm, R. R. McNeil, B. A. Dolgoshein, J.D. McFall, J. Del Peso, William S. Lockman, P.F. Ermolov, D. Zer-Zion, R. Imlay, S. Magill, I. A. T. Bauerdick, Andrea Contin, C. Fordham, L. M. Shcheglova, Y. Nakamitsu, Katsuo Tokushuku, K. Charchuła, A. Bruni, R. Loveless, A. Nigro, L.E. Sinclair, K. Homma, Ada Solano, Giuseppe Levi, M.B. Crombie, R. J. Tapper, M. Löwe, S. Dagan, S. Limentani, M. Khakzad, Umberto Dosselli, A. Kruse, M. L. Cardy, K. Jelen, P. Cloth, K. Honscheid, Yu. A. Golubkov, Marco Schioppa, B. Lu, Cristiana Peroni, Douglas Gingrich, W.R. Frisken, H.-P. Jakob, A.F. Whitfield, S.M. Mari, I. Ali, M. Geerts, K. Blankenship, R. L. Saunders, Hao Zhang, J. Kochocki, P. G. Pelfer, P. Luffman, A. Frey, K. Prytz, D. S. Bailey, B. D. Burow, Helen F Heath, Krzysztof Piotrzkowski, Janusz Chwastowski, Y Zhang, E. Barberis, A. N. Solomin, R. J. Cashmore, U. Mallik, Greg P Heath, R. Brugnera, C.R. Sampson, J. J. Whitmore, Jeffrey T. Rahn, M. Posocco, Geoffrey Smith, J.F. Zhou, V. A. Kuzmin, D. C. Bailey, M. De Giorgi, S. Bhadra, Yasunori Yamazaki, J. M. Pawlak, G.A. Blair, K. Eskreys, W.N. Murray, G. Anzivino, J. Mollen, H. Hultschig, C.J.S. Morgado, R. Seidlein, Giancarlo Susinno, M. Roco, Michele Arneodo, E. A. De Wolf, Vladimir Bashkirov, M. Derrick, P. M. Patel, V. Stamm, T. Tymieniecka, P. Bruni, Costas Foudas, Gm Levman, John Hart, H. I. Kim, M. Nakao, P. Borzemski, A. Mass, K. K. Joo, A.S. Wilson, I. Butterworth, T.P. Shah, J. A. O'Mara, J. Große-Knetter, U. Schneckloth, G. Grzelak, L.W. Mo, Christian Nemoz, Y. Iga, O. Mańczak, K. Yamauchi, G. F. Hartner, Masashi Hazumi, T. C. Bacon, G. Cara Romeo, S. M. Wang, S. Eisenhardt, D. H. Saxon, Antonino Zichichi, S.H. An, B. Gutjahr, N. Dyce, C. Rembser, U. Kötz, A. Caldwell, C. Voci, Fernando Barreiro, N. A. McCubbin, S. De Pasquale, Martin Utley, A. Prinias, Mauro Morandin, Jose Repond, K. Ohrenberg, A. Cassidy, G. Geitz, M. Nakahata, K. Muchorowski, Ta Romanowski, K.W. McLean, L. W. Hung, D. Krakauer, W. Koch, B. Y. H. Hung, I. F. de Trocóniz, A. Ladage, Meng Wang, W. H. Smith, A. A. Savin, T. Tsurugai, I. Gialas, V. K. Nadendla, J. Schroeder, R. J. Nowak, S. Söldner-Rembold, T. Doeker, A. Bargende, E. Tassi, U. F. Katz, E. Rulikowska-Zarebska, J. Roldán, F. Selonke, L. Suszycki, E. Hilger, A.S. Proskuryakov, F. F. Wilson, Roberto Sacchi, Y. Nagasawa, B. Hubbard, Mário Costa, M. Chiarini, J. A. Zakrzewski, F. J. Sciulli, T. Neumann, Leszek Adamczyk, R. van Woudenberg, D. Westphal, A. Byrne, R. Wedemeyer, Rosario Nania, Sung Keun Park, D. Revel, D. J. P. Norman, H. Beier, Jonathan Butterworth, Claudia Glasman, F.S. Chlebana, Tadeusz Kowalski, M. Krzyżanowski, G. Cases, Aharon Levy, M.I. Ferrero, A. Freidhof, P.M. Kooijman, D. K. Hasell, E. Gallo, R. Stanek, J. N. Lim, E. Badura, R. Sinkus, Ulf Behrens, Federico Cindolo, W. Bogusz, H. Kowalski, D. Schramm, C. A. Heusch, S. Kitamura, Luca Stanco, J. Shulman, S. Mine, B.Y. Oh, J. K. Sedgbeer, G. Poelz, E. Lohrmann, U. Karshon, Juan Terron, M. Kasprzak, Lutz Feld, Jens Hartmann, G. Bruni, C. Li, G. Zech, L. Hagge, Samuel Silverstein, T. Ishii, W. Schulz, James Crittenden, D. Acosta, Tobias M. Haas, M.C.K. Mattingly, L. S. Durkin, Luis Hervas, Dg Stairs, A. Dannemann, R. Hamatsu, J. Puga, R. S. Orr, J. K. Bienlein, P. B. Straub, M. Zachara, M. Adamus, G. Marini, A.K. Wróblewski, A. Bamberger, M. Grothe, Shoichi Yamada, R.C.E. Devenish, Amanda Cooper-Sarkar, D. Boscherini, Kenneth Long, B. Behrens, G. Bari, R. J. Seifert, A. Quadt, J. Bulmahn, Simon George, B. Löhr, G. Laurenti, Tachishige Hirose, F. Dal Corso, M. Van Hook, V.A. Jamieson, B. Bednarek, T. Hasegawa, A. Leich, R. Avad, P. Joos, W.F. Badgett, M. Kuze, M. Flasińki, B. Foster, Debades Bandyopadhyay, F. Zetsche, L. Iannotti, L. Wai, T. J. Llewellyn, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, R. Stroili, G. Castellini, S. M. Hong, R. L. Talaga, J.S.T. Ng, Masami Chiba, Klaus Kurt Desch, S. W. Nam, J.J. Engelen, S. Ritz, D. S. Hanna, Anselmo Margotti, L.W. Wiggers, M. Brkic, Cg Matthews, G. D'Agostini, P. Giusti, G. Zacek, G. Drews, J. A. Parsons, T. Y. Ling, W. Hain, L. Lindemann, Giovanni Abbiendi, S. Nickel, D. B. Miller, M.A.J. Botje, Robert Klanner, A. Vaiciulis, J. Gajewski, Ricardo Graciani, M. Eckert, L. Bellagamba, Y. Eisenberg, M. Basile, V. D. Kobrin, T. Dubbs, J. Biltzinger, C. P. Fagerstroem, F. Palmonari, R. Walczak, K. Heinloth, Giuseppe Barbagli, Amedeo Staiano, Danuta Kisielewska, G. Sartorelli, T. Massam, D. Filges, A. Bertolin, L. Zawiejski, M. Lancaster, C. Youngman, Roberto Cirio, J.T. Wu, J. Zając, D. Mikunas, M. Rohde, A. H. Walenta, B. Musgrave, M. St.Laurent, K. Wick, P. Morawitz, G. Briskin, E. Paul, Q. Zhu, A. Stifutkin, Aleksander Filip Żarnecki, Silvia Maselli, R. G. Field, J. Ciborowski, R. Ullmann, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, M. Dardo, C. Coldewey, V. L. Harris, Lucia Votano, C. Nath, D. Lüke, H. Heßling, A. Polini, M. H. Suh, T.L. Short, Efstathios Stiliaris, D. Daniels, M. de Kamps, J. F. Labs, Giovanni Maccarrone, S. Schlenstedt, P. J. Bussey, Roberto Carlin, D.D. Reeder, B. Diekmann, M. Wodarczyk, P. B. Kaziewicz, L. Lamberti, H. Uijterwaal, S. Mengel, J. Mainusch, Avto Kharchilava, W. Schott, Cd Catterall, and P. Göttlicher

Subjects
Quark, Particle physics, E+E ANNIHILATION, Physics and Astronomy (miscellaneous), LUND MONTE-CARLO, FOS: Physical sciences, Elementary particle, ZEUS, SIMULTANEOUS PATTERN-RECOGNITION, CENTRAL TRACKING DETECTOR, KALMAN FILTERING METHOD, JET FRAGMENTATION, HADRON DISTRIBUTIONS, QUARK FRAGMENTATION, PETRA ENERGIES, QCD JETS, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), deep inelastic scattering, 0103 physical sciences, Quantum field theory, Multiplicity (chemistry), 010306 general physics, Engineering (miscellaneous), Physics, Quantum chromodynamics, 010308 nuclear & particles physics, HERA, Deep inelastic scattering, Charged particle, High Energy Physics::Experiment
Abstract

Charged particle production has been measured in Deep Inelastic Scattering (DIS) events using the ZEUS detector over a large range of $Q^2$ from 10 to $1280 {\rm\ GeV}^2$. The evolution with $Q$ of the charged multiplicity and scaled momentum has been investigated in the current fragmentation region of the Breit frame. The data are used to study QCD \linebreak coherence effects in DIS and are compared with corresponding \ee~data in order to test the universality of quark fragmentation., 33 pages, latex, 8 figures appended as uuencoded file

Published
1995

40. Inclusive Jet Differential Cross Sections in Photoproduction at HERA

Author

Giuseppe Iacobucci, Y Zhang, S. Nickel, Antonino Zichichi, D. B. Miller, J. Gajewski, Douglas Gingrich, M. Basile, V. D. Kobrin, T. Dubbs, J. Biltzinger, P. Göttlicher, D. Haun, Giuseppe Levi, K. Jelen, W. Kröger, D. Acosta, Dg Stairs, G. Cases, J. Mollen, I. Butterworth, Y. Iga, Christian Nemoz, Cristiana Peroni, Y. Nakamitsu, Katsuo Tokushuku, R. J. Cashmore, N. Dyce, Fernando Barreiro, J.K. Mayer, A. Bertolin, K. Prytz, Luis Labarga, J. F. de Trocóniz, Umberto Dosselli, R. Ayad, C. Voci, S. Bhadra, M. Roco, D. J. Gilkinson, M. Derrick, W. Metcalf, Martin Utley, U. Holm, G.P. Heath, Krzysztof Piotrzkowski, Mauro Morandin, L. Zawiejski, Roberto Cirio, G. Cara Romeo, M. Brkic, Jose Repond, P. de Jong, T. Tymieniecka, K. Ohrenberg, Janusz Chwastowski, Jens Hartmann, G. D'Agostini, Thomas Trefzger, T. Doeker, L. W. Hung, Hartmut Sadrozinski, G. Geitz, Meng Wang, P. Giusti, G. Zacek, G. Drews, J. A. Parsons, T. Y. Ling, L. Lindemann, G. Zech, J.D. McFall, P.F. Ermolov, K. K. Joo, Giovanni Abbiendi, W. H. Smith, Mário Costa, W. Hain, B. Y. H. Hung, H.G.J.M. Tiecke, A. Bargende, A.H. Walenta, Robert Klanner, R. R. McNeil, E. A. De Wolf, U. Kötz, E. Tassi, U. F. Katz, J. Schlereth, F.S. Chlebana, P. Bruni, A. Cassidy, Costas Foudas, Ta Romanowski, K. Wick, Simon George, F. Benard, M. Rohde, Claudia Glasman, Marco Schioppa, K. Charchuła, A. Bruni, J. F. Martin, M. Löwe, Tachishige Hirose, C.J.S. Morgado, Michele Arneodo, A. Eskreys, P. G. Pelfer, L.W. Mo, Djp Norman, M.A.J. Botje, M. Iori, D. Revel, R. Stanek, E. Badura, S. Nagayama, B. Musgrave, Luca Stanco, F. F. Wilson, A. Meyer, T. Yip, M. Chiarini, M. Kuze, V. O'Dell, O. Mańczak, G. F. Hartner, J. J. Whitmore, R. Seidlein, J. K. Bienlein, B.D. Burrow, P. Cloth, R. Imlay, M. Nakahata, M. St.Laurent, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, T. Voß, P. Morawitz, A. Caldwell, F. Palmonari, F. Ikraiam, A. Mass, J. K. Sedgbeer, J. Kochocki, F. Frasconi, V. K. Nadendla, Jonathan Butterworth, Lucia Votano, C. Nath, I. Gialas, H. Heßling, A. A. Savin, L. Wai, Amedeo Staiano, S. Magill, J. Schroeder, L. Suszycki, Marcel Vreeswijk, Andrea Contin, G. Bruni, A. Kruse, R. Loveless, R. Stroili, R. J. Nowak, D. Schramm, C. A. Heusch, Cg Matthews, E. Paul, C. Fordham, Ulf Behrens, Federico Cindolo, W. Bogusz, H. Kowalski, K.W. McLean, A. Ladage, M. Zachara, F. Ciralli, Leszek Adamczyk, J. Del Peso, A. Shapira, F. J. Sciulli, S. Söldner-Rembold, E. Lohrmann, Y. Eisenberg, L.E. Sinclair, F. Dal Corso, K. Homma, T. Hasegawa, M.I. Ferrero, A. Freidhof, R. Graciani, Matthias Kasemann, T. Poser, A. Stifutkin, M. Lancaster, R. G. Feild, A. Leich, B. Lu, J.T. Wu, M.B. Crombie, K.M. Furutani, I. Ali, D. Notz, Vladimir Bashkirov, R. Walczak, B. Ladage, W.N. Murray, G. Anzivino, L. Bellagamba, S. H. Yon, James Crittenden, Aleksander Filip Żarnecki, Silvia Maselli, K. Heinloth, D. S. Bailey, J. Zaja̧c, T. W. Jones, Anna Goussiou, W. Schulz, Debades Bandyopadhyay, A. Nigro, L. S. Durkin, G. Grzelak, Giuseppe Barbagli, D. Daniels, G. L. Bashindzhagyan, N. P. Zotov, R. J. Teuscher, T. C. Bacon, M. Nakao, P. Borzemski, A.S. Wilson, E. Barberis, Helen F Heath, Wr Frisken, T.L. Short, Efstathios Stiliaris, A. N. Solomin, M. Geerts, K. Blankenship, G. Briskin, A Furtjes, M. Grothe, R.J. Tapper, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, U. Mallik, E. Rulikowska-Zarȩbska, A.F. Whitfield, S.M. Mari, L. Hagge, R. S. Orr, M. de Kamps, S. Qian, H. J. Kim, S. Mine, P. B. Straub, I. H. Park, Ben Bylsma, J. Milewski, Giovanni Maccarrone, V. L. Harris, I. Fleck, S. Schlenstedt, P. J. Bussey, Kenneth Long, R. Hamatsu, B. Behrens, J. Puga, H. Hartmann, Yasunori Yamazaki, D. Krakauer, Danuta Kisielewska, G. Bari, T. Massam, S. M. Hong, C.R. Sampson, Jose M Hernandez, H. Hultschig, Stan Bentvelsen, C. Youngman, M. Van Hook, V.A. Jamieson, B. Bednarek, M. Mattioli, R. Beuselinck, Jeffrey T. Rahn, Sridhara Dasu, Lothar At Bauerdick, R. L. Talaga, S Campbell-Robson, Halina Abramowicz, T. Ishii, J. F. Labs, B. Löhr, H. Kammerlocher, G. Sartorelli, John Hart, F. Zetsche, J. L. Thron, P. Joos, J. Stamm, B. Foster, Roberto Carlin, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, P. M. Patel, Samuel Silverstein, S. Böttcher, A. Prinias, J. Ciborowski, R. Ullmann, S.H. An, M. Dardo, C. Coldewey, B. Krebs, D. Lüke, A. Polini, M. H. Suh, B. Gutjahr, Y. Nagasawa, U. Schneekloth, W. Koch, J. A. Zakrzewski, Amanda Cooper-Sarkar, Nicolo Cartiglia, M. Adamus, J.B. Lane, T. Neumann, G. Marini, T. Tsurugai, S. Yang, Masashi Hazumi, F. Arzarello, R. J. Seifert, Rr Rau, A. Quadt, R.S. Gilmore, C. Rembser, N. A. McCubbin, A.K. Wróblewski, A. Bamberger, L. Köpke, J.A. O'Mara, H.J. Grabosch, Mariusz Flasiński, S. Dagan, S. Kitamura, Tadeusz Kowalski, S.S. Wilson, F. Selonke, E. Hilger, A. Byrne, K. Honscheid, Yu. A. Golubkov, M. Krzyżanowski, S. Kartik, D.D. Reeder, G. Poelz, Lutz Feld, J. Roldán, A.S. Proskuryakov, B.Y. Oh, R. van Woudenberg, M Eckart, B. Diekmann, Francois Corriveau, C. Li, Detlef Filges, M. Posocco, Geoffrey Smith, A. Kotański, P.M. Kooijman, D. K. Hasell, E. Gallo, J. Shulman, Tobias M. Haas, Juan Terron, M. Kasprzak, Ada Solano, Shoichi Yamada, R.C.E. Devenish, S. Limentani, P. B. Kaziewicz, L. Lamberti, H. Uijterwaal, G.A. Blair, G. Laurenti, S. Mengel, J. Mainusch, C. Rethfeldt, W. Schott, Cd Catterall, L. Iannotti, H.-P. Jakob, R. L. Saunders, R. Brugnera, V. A. Kuzmin, D. C. Bailey, M. De Giorgi, Gm Levman, S. De Paspuale, E. McCliment, N. Pavel, I. Suzuki, Rosario Nania, Sung Keun Park, William S. Lockman, A. Seiden, A. Dannemann, M. Przybycień, A. T. Doyle, J. Bulmahn, A.G. Tenner, Wouter Verkerke, R. Schattevoy, R. Yoshida, B. A. Dolgoshein, T. Kȩdzierski, T. Nagira, Roberto Sacchi, B. Hubbard, J. M. Pawlak, Aharon Levy, T.J. Llewellyn, J. N. Lim, R. Sinkus, J.-L. Schneider, K. Muchorowski, P. Luffman, A. Frey, R. Wedemeyer, K. Eskreys, T.P. Shah, S. M. Wang, D. H. Saxon, Masami Chiba, Klaus Kurt Desch, S. W. Nam, J.J. Engelen, S. Ritz, D. S. Hanna, Anselmo Margotti, L.W. Wiggers, D. Westphal, G. Theisen, U. Karshon, Luis Hervas, D. Boscherini, G. Susinno, Saverio D'Auria, G. Castellini, J.S.T. Ng, L. M. Shcheglova, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Photon, Logarithm, LUND MONTE-CARLO, Monte Carlo method, Hadron, Parton, 01 natural sciences, 7. Clean energy, EVENTS, COLLIDER, Nuclear physics, 0103 physical sciences, photoproduction, differential cross section, CALORIMETER, 010306 general physics, Parton shower, Nuclear Experiment, Physics, E+E-PHYSICS, 010308 nuclear & particles physics, ZEUS, LEADING-ORDER QCD, HERA, PHOTON, DIFFRACTIVE HARD SCATTERING, PARTON DISTRIBUTIONS, FRAGMENTATION, High Energy Physics::Experiment
Abstract

Inclusive jet differential cross sections for the reaction ep → jet + X at Q2 below 4 GeV2 have been measured with the ZEUS detector at HERA using an integrated luminosity of 0.55 pb-1. These cross sections are given in the kinematic region 0.2 < y < 0.85, for jet pseudorapidities in the ep-laboratory range -1 < ηjet < 2 and refer to jets at the hadron level with a cone radius of one unit in the η - φ plane. These results correspond to quasi-real photoproduction at centre-of-mass energies in the range 130-270 GeV and, approximately, for jet pseudorapidities in the interval -3 < ηjet(γρ CMS) < 0. These measurements cover a new kinematic regime of the partonic structure of the photon, at typical scales up to ∼300 GeV2 and photon fractional momenta down to xγ ∼ 10-2. Leading logarithm parton shower Monte Carlo calculations, which include both resolved and direct processes and use the predictions of currently available parametrisations of the photon parton distributions, describe in general the shape and magnitude of the measured ηjet and ETjet distributions.

Published
1995

41. Exclusive \(\rho^{0}\) production in deep inelastic electron-proton scattering at HERA

Author

K. K. Joo, M. Martinez, J. F. Martin, A. Nigro, T. Yip, O. Mańczak, G. F. Hartner, A.F. Whitfield, S.M. Mari, A. Eskreys, Djp Norman, D. Westphal, Guenter Wolf, A. Bernstein, J. T. Rahn, U. Karshon, Y. Zamora Garcia, T. Voß, M.A.J. Botje, Thomas Trefzger, Luis Hervas, Andrea Contin, A. Kruse, D. Boscherini, G. Susinno, T. Monteiro, Detlef Filges, L. M. Shcheglova, Marcella Capua, G. Castellini, P.M. Kooijman, D. K. Hasell, Antonino Zichichi, F. Palmonari, N. Cartiglia, E. Gallo, A. Prinias, W. Koch, Roberto Sacchi, H.G.J.M. Tiecke, F. Benard, J.S.T. Ng, B. Löhr, P. Joos, J. Stamm, P. Bruni, Costas Foudas, B. Foster, Ta Romanowski, J. Shulman, Claudia Glasman, Giuseppe Iacobucci, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, Amedeo Staiano, Danuta Kisielewska, R. Yoshida, L.W. Mo, R. Stanek, H. Beier, Tadeusz Kowalski, Juan Terron, M. Kasprzak, M. Pfeiffer, T. Massam, C. Youngman, Aharon Levy, T.J. Llewellyn, J. N. Lim, S. Dagan, R. Graciani, E. Badura, R. S. Orr, K. Honscheid, Yu. A. Golubkov, C. P. Fagerstroem, G. Poelz, Lutz Feld, R. Sinkus, Cristiana Peroni, R. J. Cashmore, Luis Labarga, Luca Stanco, E. Rulikowska-Zarȩbska, S. Mine, B. Lu, Ada Solano, Cg Matthews, A. Caldwell, G. Cases, H.-P. Jakob, Lothar At Bauerdick, F. F. Wilson, M. Chiarini, Yasunori Yamazaki, J. M. Pawlak, P. B. Straub, Kenneth Long, R. L. Saunders, M. Derrick, T. Tymieniecka, J. K. Sedgbeer, S. Limentani, M. Posocco, Geoffrey Smith, Tobias M. Haas, Jonathan Butterworth, John Hart, B. Behrens, G. Bruni, G. Bari, K.W. McLean, A. Ladage, U. Kötz, J.B. Lane, S. Söldner-Rembold, Jens Hartmann, R. Loveless, R. Brugnera, S. W. Nam, Shoichi Yamada, R.C.E. Devenish, F. J. Sciulli, Simon George, A. Frey, D. Krakauer, V. A. Kuzmin, D. C. Bailey, A. Bertolin, M. Van Hook, B. Bednarek, Rr Rau, O. Yu. Lukina, V. K. Nadendla, L. Köpke, J.A. O'Mara, M. Geerts, K. Blankenship, M. L. Utley, J.J. Engelen, M. Eckert, L. Bellagamba, A. Garfagnini, R. R. McNeil, G. Laurenti, S. Nickel, R. J. Nowak, F. Zetsche, C.R. Sampson, K. Muchorowski, Tachishige Hirose, M. De Giorgi, D. B. Miller, J. Gajewski, T.P. Shah, S. M. Wang, P. M. Patel, Lucia Votano, S. Ritz, D. S. Hanna, Y. Nagasawa, C. Nath, H. Heßling, J. F. de Trocóniz, Anselmo Margotti, D. J. Gilkinson, L. Zawiejski, D. H. Saxon, A. Freidhof, M. Khakzad, Roberto Cirio, K.F. Johnson, P. Giusti, L.W. Wiggers, L. Iannotti, J. K. Bienlein, F. Selonke, E. Hilger, V.A. Noyes, M. Basile, R. Wedemeyer, Giuseppe Levi, J. A. Zakrzewski, Douglas Gingrich, Gm Levman, D. S. Waters, V. D. Kobrin, T. Dubbs, J. Biltzinger, Ulf Behrens, Federico Cindolo, W. Bogusz, H. Kowalski, G. Zacek, S. Kartik, G. Drews, J. A. Parsons, W. Hain, M. Krzyżanowski, C. Fordham, M. Kuze, Y. Nakamitsu, Rosario Nania, Sung Keun Park, Katsuo Tokushuku, Masashi Hazumi, C. Rembser, N. A. McCubbin, S. Polenz, S. Mengel, Francois Corriveau, J. Mainusch, E. McCliment, W. Metcalf, K. Jelen, M. Rohde, K. Wick, K. Yamauchi, B. Musgrave, M. Zachara, M. St.Laurent, U. Holm, J. M. Hernandez, G.P. Heath, K. Charchuła, B.Y. Oh, A. Bruni, Umberto Dosselli, Janusz Chwastowski, A. Kotański, M. Brkic, A. Dannemann, A. Seiden, N. Wulff, M. Przybycień, A.H. Walenta, Masami Chiba, Klaus Kurt Desch, G. D'Agostini, E. Paul, Avto Kharchilava, C. Li, Christian Nemoz, W. Schott, J. Roldán, James Crittenden, N. Dyce, E. A. De Wolf, J. R. Tickner, Cd Catterall, T. Ishii, B. D. Burow, T. Y. Ling, A. T. Doyle, L. Wai, L. Lindemann, Wouter Verkerke, A. Stifutkin, E. Barberis, G. Zech, P. Morawitz, N. Pavel, I. Suzuki, B. A. Dolgoshein, R. Stroili, Giovanni Abbiendi, A.S. Proskuryakov, Robert Klanner, Lars Hagge, W.N. Murray, G. Anzivino, M. Lancaster, A. Vaiciulis, C. Voci, R. van Woudenberg, M. Löwe, J.T. Wu, J. Bulmahn, A. N. Solomin, B. Surrow, S. Bhadra, T.L. Short, Efstathios Stiliaris, M. Nakao, P. Borzemski, U. Mallik, J. P. Fernandez, D. C. Williams, Aleksander Filip Żarnecki, Silvia Maselli, Y. Eisenberg, William S. Lockman, J. Ciborowski, R. Ullmann, M.C.K. Mattingly, L. S. Durkin, T. Doeker, A.S. Wilson, S.H. An, M. Grothe, B. Gutjahr, R.J. Tapper, M. de Kamps, W. B. Schmidke, K. Heinloth, R. Hamatsu, Giuseppe Barbagli, I. Ali, V.A. Kurzhavina, D.D. Reeder, B. Diekmann, M. Wodarczyk, M. Dardo, C. Coldewey, J. Puga, H. J. Kim, A. Cassidy, Giovanni Maccarrone, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, J. Große-Knetter, D. S. Bailey, V. L. Harris, M. Nakahata, M. Veeswijk, M. Adamus, O. Schwarzer, Helen F Heath, Wr Frisken, I. A. Korzhavina, I. Butterworth, Roman Walczak, D. Lüke, Y. Iga, A. Polini, G. Marini, S. Schlenstedt, P. J. Bussey, Fernando Barreiro, D. Acosta, Dg Stairs, T. Tsurugai, G. Sartorelli, Np Zotov, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, Krzysztof Piotrzkowski, M. H. Suh, Mauro Morandin, U. Schneekloth, Marco Schioppa, J. J. Whitmore, P. G. Pelfer, J.I. Fleck, T. Neumann, D. Schramm, C. A. Heusch, Mariusz Flasiński, L. W. Hung, S. Kitamura, A. Byrne, R. Seidlein, K. Prytz, P. B. Kaziewicz, M. Corradi, S. Yang, L. Lamberti, D. Mikunas, J. Zaja̧c, A. Bargende, E. Tassi, R. Ayad, M. Roco, H. Uijterwaal, G. Cara Romeo, R.S. Gilmore, H.J. Grabosch, U. F. Katz, J. F. Labs, M. L. Cardy, J.F. Zhou, E. Lohrmann, O. Deppe, B. Y. H. Hung, D. Revel, A. Meyer, Roberto Carlin, S.S. Wilson, K.M. Furutani, W. Schulz, J. Del Peso, L.E. Sinclair, K. Homma, G. Briskin, Q. Zhu, Vladimir Bashkirov, Jose Repond, K. Ohrenberg, N. Bruemmer, Meng Wang, G. Grzelak, W. H. Smith, T. C. Bacon, Mário Costa, S. De Pasquale, F.S. Chlebana, I. Gialas, J. Schroeder, Leszek Adamczyk, M.I. Ferrero, R. G. Feild, Matthias Kasemann, P. Göttlicher, D. Notz, K. Desler, S. H. Yon, T. W. Jones, Anna Goussiou, G. L. Bashindzhagyan, R. J. Teuscher, Hartmut Sadrozinski, I. H. Park, Ben Bylsma, Hao Zhang, J. Milewski, H. Hartmann, Sridhara Dasu, S. Eisenhardt, S Campbell-Robson, Halina Abramowicz, J.D. McFall, P.F. Ermolov, D. Zer-Zion, P. Cloth, R. Imlay, S. Magill, F. Dal Corso, T. Hasegawa, A. Leich, W.F. Badgett, Debades Bandyopadhyay, S. M. Hong, R. L. Talaga, C.J.S. Morgado, Michele Arneodo, A. A. Savin, L. Suszycki, Samuel Silverstein, Amanda Cooper-Sarkar, R. J. Seifert, A. Quadt, J. Mollen, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Pomeron, Cross section (physics), 0103 physical sciences, photoproduction, cross section measurement, 010306 general physics, DETECTOR, Physics, Quantum chromodynamics, Research Groups and Centres\Physics\Low Temperature Physics, 010308 nuclear & particles physics, Scattering, Faculty of Science\Physics, Perturbative QCD, ELECTROPRODUCTION, ZEUS, HERA, QCD, Gluon, High Energy Physics::Experiment
Abstract

The exclusive production of $\rho^0$ mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range $7 < Q^2 < 25$ GeV$^2$ for $\gamma^*p$ centre of mass (c.m.) energies from 40 to 130 GeV. The $\gamma^*p \to \rho^0 p$ cross section exhibits a $Q^{-(4.2 \pm 0.8 ^{+1.4}_{-0.5})}$ dependence and both longitudinally and transversely polarised $\rho^0$'s are observed. The $\gamma^*p \to \rho^0 p$ cross section rises strongly with increasing c.m. energy, when compared with NMC data at lower energy, which cannot be explained by production through soft pomeron exchange. The data are compared with perturbative QCD calculations where the rise in the cross section reflects the increase in the gluon density at low $x$. the gluon density at low $x$., Comment: 22 pages, latex, 4 figures appended

Published
1995

42. MEASUREMENT OF TOTAL AND PARTIAL PHOTON PROTON CROSS-SECTIONS AT 180 GEV CENTER-OF-MASS ENERGY

Author

S.H. An, B. Gutjahr, Danuta Kisielewska, Cg Matthews, D. Schramm, C. A. Heusch, F. Benard, Lorenzo Bellagamba, D. Westphal, C. Youngman, T. Tsurugai, E. McCliment, John Parsons, Y. Nakamitsu, E. Lohrmann, J.C. Giddings, H. Kreutzmann, D. Krakauer, K. Prytz, T. Poser, G. Theisen, U. Karshon, Luis Hervas, G. Susinno, K.M. Furutani, T. Y. Kim, S. Mine, C. Raine, Katsuo Tokushuku, R. J. Tapper, C. Peroni, M. Roco, F. Selonke, G. Cara Romeo, M. Przybycień, Masashi Hazumi, G. Geitz, Yuji Yamazaki, W. Schulz, R. Yoshida, N. A. McCubbin, F. Arzarello, Saverio D'Auria, A. Nigro, Umberto Dosselli, E. Hilger, C. Rembser, S. Böttcher, Ada Solano, Y. Nagasawa, J.B. Lane, Mariusz Flasiński, A. Byrne, Graziano Bruni, Wouter Verkerke, A.M. Khan, J.S.T. Ng, M. Mattioli, Simon George, Vladimir Bashkirov, Tobias M. Haas, F. J. Sciulli, Tachishige Hirose, M. Krzyżanowski, Antonino Zichichi, David Cussans, Janusz Chwastowski, Lothar At Bauerdick, S. Limentani, Rr Rau, A. Contin, R. Schattevoy, B. A. Dolgoshein, T. Nagira, L. Köpke, M. Kuze, A.F. Whitfield, B.Y. Oh, J. F. Martin, Ivor Fleck, J. A. Zakrzewski, A. Freidhof, L. Wai, N. Pavel, I. Suzuki, Ta Romanowski, W. Kröger, D. Acosta, Dg Stairs, P.L. Makkar, R. Stroili, I. H. Park, Ben Bylsma, G. Grzelak, S. Bentyelsen, T. C. Bacon, Shoichi Yamada, Richard Teuscher, M. Iori, T. Yip, J. Mollen, J. Milewski, J. Krüger, E. A. De Wolf, Claudia Glasman, B. Löhr, G.A. Blair, Michele Guida, J. M. Pawlak, E. Rulikowska-Zarebska, Jose Repond, K. Ohrenberg, F. F. Wilson, M. Chiarini, J.-L. Schneider, C. Li, S. Nickel, D. B. Miller, Abraham Seiden, T. Kedzierski, Meng Wang, W. Vogel, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, M. Lancaster, D.D. Reeder, James Crittenden, H. Hartmann, J. Gajewski, J. Roldán, E. Badura, P. Joos, M. Basile, Jonathan Butterworth, Masami Chiba, Jose M Hernandez, K. Jeleń, R. van Woudenberg, W. H. Smith, S. De Pasquale, G. Laurenti, B. Foster, T. Massam, V. D. Kobrin, P. Göttlicher, E.N. Kuznetsov, Lucia Votano, Giuseppe Iacobucci, S. Kartik, B. Diekmann, H. Heßling, Robin Devenish, J. Biltzinger, L. Adamczyk, Luca Stanco, P. Bruni, Costas Foudas, L.W. Mo, Klaus Kurt Desch, K. Muchorowski, Mário Costa, C. Del Papa, Samuel Silverstein, S. Qian, P. Luffman, A. Frey, Giuseppe Levi, V. O'Dell, O. Mańczak, G. F. Hartner, Nicolo Cartiglia, D. Haun, Francois Corriveau, J. K. Sedgbeer, Detlef Filges, A.H. Walenta, F.S. Chlebana, G. Cases, J. Engelen, Sridhara Dasu, D. J. Gilkinson, K. Eskreys, Luisa Cifarelli, Neville Harnew, A Furtjes, F. Gasparini, S. Yang, D. K. Hasell, P. Giusti, G. Drews, Halina Abramowicz, E. Gallo, T. Bienz, A. Kotański, A. Caldwell, L. S. Durkin, A.G. Tenner, R. Wedemeyer, W. Metcalf, Silvia Maselli, U. Holm, Thomas Trefzger, Y. Eisenberg, A. Meyer, W. Hain, J. Shulman, R.S. Gilmore, H.J. Grabosch, H.-P. Jakob, W. S. Lockman, R. Hamatsu, J. Puga, Robert Orr, F. Frasconi, Rosario Nania, D. Horstmann, R. Timellini, A. Dake, I. Butterworth, T.P. Shah, R. Graciani, R. R. McNeil, N. H. Brook, V. L. Harris, Y. Iga, L. Lamberti, H. Uijterwaal, Matthias Kasemann, R. Walczak, K. Heinloth, A. Eskreys, Juan Terron, M. Kasprzak, Giuseppe Barbagli, R. Brugnera, Krzysztof Piotrzkowski, D. Notz, B. Lu, K. Charchuła, A. T. Doyle, J. Schlereth, K. Wick, S. H. Yon, M.A.J. Botje, Jens Hartmann, A. Kruse, S.S. Wilson, Douglas Gingrich, A. Cassidy, M. Nakahata, M. Adamus, J.R. Forbes, K.W. McLean, V. A. Kuzmin, D. C. Bailey, M. De Giorgi, A. Dannemann, T. W. Jones, Anna Goussiou, S. W. Nam, M. Löwe, J. Kochocki, S. Dagan, G. L. Bashindzhagyan, N. P. Zotov, Amanda Cooper-Sarkar, Marcel Vreeswijk, S. K. Park, P. Kooijman, F. Palmonari, G. Marini, Marco Schioppa, S. Kramarczyk, P. G. Pelfer, A. Ladage, S. Söldner-Rembold, A.K. Wróblewski, A. Bamberger, Roberto Sacchi, B. Hubbard, K. Honscheid, Yu. A. Golubkov, G. Sartorelli, J. J. Whitmore, R. J. Seifert, Ulf Behrens, Federico Cindolo, H. Kowalski, Amedeo Staiano, M. Stavrianakou, F. Ciralli, R. Seidlein, S. Ritz, D. S. Hanna, S. Mengel, J. Mainusch, Gm Levman, J. Bulmahn, H. Tiecke, Aharon Levy, T.J. Llewellyn, A. Vorvolakos, P.F. Ermolov, R. Loveless, R. Ayad, J. Del Peso, U. Schneekloth, T. Neumann, A. Mass, Anselmo Margotti, L.W. Wiggers, I. Gialas, Hartmut Sadrozinski, M. Nuti, J. Schroeder, M. Posocco, Geoffrey Smith, J. N. Lim, A. Prinias, J. A. Nash, R. Sinkus, Stefano Maria Mari, T.L. Short, Efstathios Stiliaris, L. Hagge, J. K. Bienlein, S. Kitamura, M. Geerts, K. Blankenship, C. Rethfeldt, W. Schott, Cd Catterall, R. J. Cashmore, Luis Labarga, W. Koch, Christian Nemoz, T. Ishii, C. Fordham, I. Ali, C.R. Sampson, A. Shapira, F. W. Bullock, G. Castellini, M. Derrick, M. de Kamps, N. Dyce, T. Tymieniecka, L.E. Sinclair, P. Cloth, Tadeusz Kowalski, R. Imlay, C. Voci, K. Homma, M. Zachara, Helen F Heath, Wr Frisken, M. Brkic, J. A. O'Mara, U. Kötz, H. J. Kim, S. Bhadra, Alessia Bruni, M.I. Ferrero, S. Magill, G. Poelz, Giovanni Maccarrone, Lutz Feld, Robert Stanek, G. D'Agostini, S. Schlenstedt, P. J. Bussey, P.M. Patel, R. G. Feild, C. O. Kim, V. K. Nadendla, H. Hultschig, T. Y. Ling, T. Doeker, S. Nagayama, B. D. Burow, H. Kammerlocher, John Hart, G. Zech, W.N. Murray, R. J. Nowak, Giovanni Abbiendi, F. Ikraiam, M.B. Crombie, C.J.S. Morgado, Michele Arneodo, G. Anzivino, N.C. Roocroft, Robert Klanner, M. Nakao, P. Borzemski, Fernando Barreiro, A.S. Wilson, A. A. Savin, L. Suszycki, F. Dal Corso, D. H. Saxon, T. Hasegawa, A. Leich, Af Zarnecki, Debades Bandyopadhyay, S. M. Hong, R. L. Talaga, Mauro Morandin, L. W. Hung, P. B. Straub, Kenneth Long, A. Bargende, U. F. Katz, B. Behrens, G. Bari, M. Van Hook, V.A. Jamieson, B. Bednarek, R. Beuselinck, D. Revel, A. A. Voronin, F. Zetsche, J. L. Thron, E. Barberis, A. N. Solomin, U. Mallik, T. Khatri, J.W. Mitchell, Greg P Heath, J. Ciborowski, R. Ullmann, M. Dardo, C. Coldewey, B. Krebs, Leonid Gladilin, D. Lüke, Davide Boscherini, D. Zer-Zion, P. de Jong, M. H. Suh, J.K. Mayer, A. Bertolin, D. Shaw, J. Zajc, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, M. Rohde, B. Musgrave, M. St.Laurent, E. Paul, A. Stifutkin, J. F. Labs, and Roberto Carlin

Subjects
Particle physics, Photon, Physics and Astronomy (miscellaneous), Proton, ZEUS, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, DIFFRACTION DISSOCIATION, MONTE-CARLO, HADRONIC PROPERTIES, COLLIDER ENERGIES, EVENT GENERATOR, HERA ENERGIES, PHOTOPRODUCTION, inelastic cross section, Nuclear physics, Vector meson, cross section measurement, Engineering (miscellaneous), Physics, ZEUS (particle detector), Detector, HERA, diffractive production, Cross section (geometry), High Energy Physics::Experiment, Center of mass
Abstract

Photon proton cross sections for elastic light vector meson production, σel νp, inelastic diffractive production, σnd νp, non-diffractive production, σd νp, as well as the total cross section, σtot νp, have been measured at an average υp center of mass energy of 180 GeV with the ZEUS detector at HERA. The resulting values are σel νp = 18 ± 7 μb, σd νp = 33 ± 8 μb, σnd νp = 91 ± 11 μb, and σtot νp 143 ± 17 μb, where the errors include statistical and systematic errors added in quadrature. © 1994 Springer-Verlag.

Published
1994

43. Measurement of the Proton Structure-function F2 In ep Scattering At Hera

Author

E. Barberis, Fernando Barreiro, U. Mallik, T. Khatri, J.W. Mitchell, Greg P Heath, Mauro Morandin, Z. Jakubowski, R. Gläser, L. W. Hung, A. Bargende, D. Revel, A. A. Voronin, A. Meyer, A. Montag, Marcel Vreeswijk, J. Del Peso, L.E. Sinclair, K. Homma, M.B. Crombie, Marco Schioppa, P. G. Pelfer, S.J.P. Smith, I. McArthur, P. Bruni, Costas Foudas, L.W. Mo, K. U. Pösnecker, R. Seidlein, J. F. Martin, A. Mass, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, A. Caldwell, F. Frasconi, M. Lancaster, D.D. Reeder, Masashi Hazumi, H. F.W. Sadrozinski, A. Shapira, B. Diekmann, R. Yoshida, B.D. Burow, F. Bernard, N. A. McCubbin, D. Haun, C. Del Papa, J.R. Forbes, K.W. McLean, F. J. Sciulli, A. Ladage, T. Kȩdzierski, A. Vorvolakos, G. Cases, M. Krzyanowski, A. Freidhof, B. Lu, T. Nagira, S. Söldner-Rembold, C.J.S. Morgado, Michele Arneodo, N.C. Roocroft, S.H. An, B. Gutjahr, J. M. Pawlak, R. Meijer Drees, P. Giusti, R. Brugnera, C. Fordham, V. A. Kuzmin, D. C. Bailey, M. De Giorgi, P.M. Hallam-Baker, T.L. Short, Efstathios Stiliaris, G. Castellini, M. Zachara, M. Iori, G. Drews, A. Nigro, Michele Guida, Jose Repond, James Crittenden, J. A. Parsons, J. Roldán, M. de Kamps, J. Nash, M. Kückes, R. van Woudenberg, L. Lamberti, G. Grzelak, D. Schramm, C. A. Heusch, T. C. Bacon, S. Böttcher, W. Hain, A. Eskreys, Gm Levman, S. Kramaczyk, A. Dwuraźny, A.F. Whitfield, A. A. Savin, Detlef Filges, H. Uijterwaal, H. J. Kim, M.A.J. Botje, F. Arzarello, K. Muchorowski, D. K. Hasell, E. Gallo, P.M. Patel, K. O'Shaughnessy, Mariusz Flasiński, L. Suszycki, Giovanni Maccarrone, K. Prytz, A. Byrne, S. De Pasquale, W.N. Murray, G. Anzivino, A Furtjes, F. Gasparini, A. Kruse, S. Schlenstedt, P. J. Bussey, J. Shulman, A. Zichini, W. H. Smith, G. Gloth, H. Müsch, R. Wedemeyer, Rosario Nania, Sung Keun Park, Ulf Behrens, Federico Cindolo, H. Kowalski, S. Qian, E. Lohrmann, F. Ciralli, H. Kreutzmann, I. Gialas, O. Lin, Silvia Maselli, M. Momayezi, M. Nuti, Juan Terron, M. Kasprzak, M. Nakao, P. Borzemski, E. Badura, Mário Costa, U. Contino, Samuel Silverstein, L. Hagge, J. Schroeder, F.S. Chlebana, Amedeo Staiano, Cg Matthews, S. W. Nam, A. Dannemann, T. Ishii, K.M. Furutani, I. Fleck, Leszek Adamczyk, M.I. Ferrero, J.D. Prentice, R. Timellini, A. Dake, N. H. Brook, V. L. Harris, G. Feild, J. Bulmahn, N. Pavel, P. Erhard, Jens Hartmann, W. Schulz, R. Loveless, I. Suzuki, P. Kooijman, T. S. Yoon, Giuseppe Iacobucci, T. Poser, S. Ritz, D. S. Hanna, R. J. Seifert, J.B. Lane, William S. Lockman, Anselmo Margotti, L.W. Wiggers, H. van der Lugt, Rr Rau, M. Geerts, K. Blankenship, R. R. McNeil, Danuta Kisielewska, A. Stopczyński, C. Youngman, C.R. Sampson, A. Contin, L. Köpke, Stefano Maria Mari, L. Bellagamba, A. Francescato, A. M. Cooper-Sarkar, S. Dagan, K. Charchuła, A. Bruni, J. K. Bienlein, J. Ciborowski, R. Ullmann, D. J. Gilkinson, W. Metcalf, Ta Romanowski, F. Dal Corso, M. Löwe, M. Dardo, Masami Chiba, K. Honscheid, Yu. A. Golubkov, S. Nagayama, P. Göttlicher, T. Hasegawa, J. Zaja̧c, Klaus Kurt Desch, A. Leich, S. Mengel, J. Mainusch, J. J. Whitmore, A.G. Tenner, H. Tiecke, F. Ikraiam, S. Nickel, D. B. Miller, U. Holm, Debades Bandyopadhyay, J. Gajewski, C. Coldewey, M. Posocco, B. Nizioł, B. Krebs, M. Basile, F. F. Wilson, T. Massam, J. Biltzinger, M. Chiarini, C. Peroni, M. Roco, Geoffrey Smith, K. Wick, C. Rethfeldt, W. Schott, Cd Catterall, H.-P. Jacob, F. Palmonari, E. Tscheslog, D. Westphal, G. Theisen, U. Karshon, A.F. arnecki, Krzysztof Piotrzkowski, Jonathan Butterworth, F. W. Bullock, G. Geitz, Luis Hervas, S. M. Hong, R. L. Talaga, D. Boscherini, G. Susinno, A.H. Walenta, Saverio D'Auria, D. Krakauer, Kr Long, D. Lüke, D. Zer-Zion, M. H. Suh, J.S.T. Ng, J. Kochocki, Simon George, Tachishige Hirose, Roberto Sacchi, Y. Nagasawa, A. Prinias, W. Koch, B. Hubbard, Giuseppe Levi, M. Kuze, R. Hamatsu, Tadeusz Kowalski, L. Wai, K. Jelen, J. Engelen, P.L. Makkar, R. Stroili, J. Mollen, G. Poelz, J.K. Mayer, Aharon Levy, D. Shaw, Tobias M. Haas, W. Kröger, J. N. Lim, E.N. Kuznetsov, O. Mańczak, Dg Stairs, Shoichi Yamada, R.C.E. Devenish, G. F. Hartner, G. Laurenti, J. F. de Trocóniz, I. Butterworth, Y. Iga, L. Zawiejski, Roberto Cirio, P. de Jong, J.-L. Schneider, W. Vogel, H. Brückmann, P. Luffman, A. Frey, M. Rohde, B. Musgrave, M. St.Laurent, K. Eskreys, T.P. Shah, D. H. Saxon, E. Paul, G. Cara Romero, G.G. Stairs, T. Tsurugai, E. McCliment, J.C. Giddings, D.M. Gingrich, A. Seiden, R. Casaccia, M. Przybycień, S.S. Wilson, S. Repond, A. T. Doyle, A.M. Khan, R. Schattevoy, G. Bari, J. F. Labs, Roberto Carlin, L. S. Durkin, Ada Solano, R. Walczak, M. Adamus, S. Limentani, G. Marini, A.K. Wróblewski, A. Bamberger, F. Selonke, E. Hilger, M. Z. Wang, G.A. Blair, B.Y. Oh, C. Li, Stan Bentvelsen, S. Kartik, Eduardo Ros, R. J. Cashmore, Luis Labarga, M. Derrick, T. Tymieniecka, J. A. O'Mara, U. Kötz, Vivian O'Dell, C. O. Kim, V. K. Nadendla, R. J. Nowak, Francois Corriveau, A. Kotański, P. Morawitz, S. Kasai, A. Cassidy, M. Nakahata, U. Schneekloth, T. Neumann, S. Kitamura, Christian Nemoz, N. Dyce, C. Voci, S. Bhadra, T. Doeker, G. Jahnen, Claudia Glasman, R. Stanek, Luca Stanco, J. K. Sedgbeer, T. Bienz, G. Bruni, J.A. Zakrzewski, J. Leslie, Lucia Votano, Y. Eisenberg, B. Losowski, K. Heinloth, Giuseppe Barbagli, G. Sartorelli, R. S. Orr, P. B. Straub, M. Brkic, B. Behrens, G. D'Agostini, T. Y. Ling, G. Zech, Giovanni Abbiendi, Robert Klanner, V.A. Jamieson, B. Bednarek, R. Beuselinck, F. Zetsche, J. L. Thron, Y. Nakamitsu, Katsuo Tokushuku, R. J. Tapper, Umberto Dosselli, David Cussans, Janusz Chwastowski, E. A. De Wolf, I. H. Park, Ben Bylsma, J. Milewski, J. Krüger, H. Hartmann, Sridhara Dasu, Halina Abramowicz, Matthias Kasemann, D. Notz, S. H. Yon, T. W. Jones, Anna Goussiou, G. L. Bashindzhagyan, N. P. Zotov, R. J. Teuscher, Hideki Okuno, P.F. Ermolov, D. Monaldi, P. Cloth, R. Imlay, S. Magill, T.J. Llwellyn, E. Rulikowska-Zarȩbska, T. Y. Kim, S. Mine, C. Raine, M. Mattioli, Lothar At Bauerdick, Thomas Trefzger, B. Löhr, P. Joos, B. Foster, Yasunori Yamazaki, H. Hultschig, H. Kammerlocher, John Hart, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, Nicolo Cartiglia, S. Yang, R.S. Gilmore, H.J. Grabosch, R. Ayad, I. Ali, Helen F Heath, Wr Frisken, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Repond, J, Repond, S, Stanek, R, Talaga, Rl, Thron, J, Arzarello, F, Ayad, R, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Bruni, P, Romeo, Gc, Castellini, G, Chiarini, M, Cifarelli, L, Cindolo, F, Ciralli, F, Contin, A, Dauria, S, Delpapa, C, Frasconi, F, Giusti, P, Iacobucci, G, Laurenti, G, Levi, G, Lin, Q, Lisowski, B, Maccarrone, G, Margotti, A, Massam, T, Monaldi, D, Nania, R, Nemoz, C, Palmonari, F, Sartorelli, G, Timellini, R, Garcia, Yz, Zichichi, A, Bargende, A, Crittenden, J, Desch, K, Diekmann, B, Doeker, T, Frey, A, Geerts, M, Geitz, G, Hartmann, H, Haun, D, Heinloth, K, Hilger, E, Jakob, Hp, Kramarczyk, S, Kuckes, M, Mass, A, Mengel, S, Mollen, J, Musch, H, Paul, E, Schattevoy, R, Schneider, Jl, Schramm, D, Wedemeyer, R, Cassidy, A, Cussans, Dg, Dyce, N, Foster, B, George, S, Gilmore, R, Heath, Gp, Heath, Hf, Lancaster, M, Llewellyn, Tj, Morgado, Cj, Omara, Ja, Tapper, Rj, Wilson, S, Yoshida, R, Rau, Rr, Arneodo, M, Schioppa, M, Susinno, G, Bernstein, A, Caldwell, A, Gialas, I, Parsons, Ja, Ritz, S, Sciulli, F, Straub, Pb, Wai, L, Yang, S, Borzemski, P, Chwastowski, J, Dwurazny, A, Eskreys, A, Jakubowski, Z, Niziol, B, Piotrzkowski, K, Zachara, M, Zawiejski, L, Adamczyk, L, Bednarek, B, Eskreys, K, Jelen, K, Kisielewska, D, Kowalski, T, Rulikowskazarebska, E, Suszycki, L, Zajac, J, Kedzierski, T, Kotanski, A, Przybycien, M, Bauerdick, Lat, Behrens, U, Bienlein, Jk, Bottcher, S, Coldewey, C, Dannemann, A, Drews, G, Erhard, P, Flasinski, M, Fleck, I, Gilkinson, Dj, Glaser, R, Gottlicher, P, Gutjahr, B, Haas, T, Hagge, L, Hain, W, Hasell, D, Hultschig, H, Jahnen, G, Joos, P, Kasemann, M, Klanner, R, Koch, W, Kopke, L, Kotz, U, Kowalski, H, Kroger, W, Kruger, J, Labs, J, Ladage, A, Lohr, B, Lowe, M, Luke, D, Mainusch, J, Manczak, O, Momayezi, M, Ng, Jst, Nickel, S, Notz, D, Posnecker, Ku, Rohde, M, Roldan, J, Ros, E, Schneekloth, U, Schroeder, J, Schulz, W, Selonke, F, Stiliaris, E, Tscheslog, E, Tsurugai, T, Vogel, W, Westphal, D, Wolf, G, Youngman, C, Grabosch, Hj, Leich, A, Meyer, A, Rethfeldt, C, Schlenstedt, S, Barbagli, G, Francescato, A, Nuti, M, Pelfer, P, Anzivino, G, Casaccia, R, Depasquale, S, Qian, S, Votano, L, Bamberger, A, Freidhof, A, Poser, T, Soldnerrembold, S, Theisen, G, Trefzger, T, Brook, Nh, Bussey, Pj, Doyle, At, Forbes, Jr, Jamieson, Va, Raine, C, Saxon, Dh, Bruckmann, H, Gloth, G, Holm, U, Kammerlocher, H, Krebs, B, Neumann, T, Wick, K, Furtjes, A, Lohrmann, E, Milewski, J, Nakahata, M, Pavel, N, Poelz, G, Schott, W, Terron, J, Zetsche, F, Bacon, Tc, Beuselinck, R, Butterworth, I, Gallo, E, Harris, Vl, Miller, Db, Prinias, A, Sedgbeer, Jk, Vorvolakos, A, Whitfield, A, Bienz, T, Kreutzmann, H, Mallik, U, Mccliment, E, Roco, M, Wang, Mz, Cloth, P, Filges, D, An, Sh, Hong, S, Kim, Co, Kim, Ty, Nam, Sw, Park, Sk, Suh, Mh, Yon, Sh, Imlay, R, Kartik, S, Kim, Hj, Mcneil, Rr, Metcalf, W, Nadendla, Vk, Barreiro, F, Cases, G, Hervas, L, Labarga, L, Delpeso, J, Detroconiz, Jf, Ikraiam, F, Mayer, Jk, Smith, Gr, Corriveau, F, Hanna, D, Hartmann, J, Hung, Lw, Lim, Jn, Drees, Rm, Matthews, C, Mitchell, Jw, Patel, Pm, Sinclair, Le, Stairs, Dg, Stlaurent, M, Ullmann, R, Bashindzhagyan, Gl, Ermolov, Pf, Gladilin, Lk, Golubkov, Ya, Kuzmin, Va, Kuznetsov, En, Savin, Aa, Voronin, Ag, Zotov, Np, Bentvelsen, S, Botje, M, Dake, A, Engelen, J, Dejong, P, Dekamps, M, Kooijman, P, Kruse, A, Vanderlugt, H, Odell, V, Tenner, A, Tiecke, H, Uijterwaal, H, Vreeswijk, M, Wiggers, L, Dewolf, E, Vanwoudenberg, R, Bylsma, B, Durkin, L, Honscheid, K, Li, C, Ling, Ty, Mclean, Kw, Murray, Wn, Park, Ih, Romanowski, Ta, Seidlein, R, Blair, Ga, Byrne, A, Cashmore, Rj, Coopersarkar, Am, Devenish, Rce, Gingrich, Dm, Hallambaker, Pm, Harnew, N, Khatri, T, Long, Kr, Luffman, P, Mcarthur, I, Morawitz, P, Nash, J, Smith, Sjp, Roocroft, Nc, Wilson, Ff, Abbiendi, G, Brugnera, R, Carlin, R, Dalcorso, F, Degiorgi, M, Dosselli, U, Gasparini, F, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Butterworth, Jm, Bulmahn, J, Feild, G, Oh, By, Whitmore, J, Contino, U, Dagostini, G, Guida, M, Iori, M, Mari, Stefano Maria, Marini, G, Mattioli, M, Nigro, A, Hart, Jc, Mccubbin, Na, Prytz, K, Shah, Tp, Short, Tl, Barberis, E, Cartiglia, N, Heusch, C, Hubbard, B, Leslie, J, Lockman, W, Oshaughnessy, K, Sadrozinski, Hf, Seiden, A, Zerzion, D, Badura, E, Biltzinger, J, Seifert, Rj, Walenta, Ah, Zech, G, Dagan, S, Levy, A, Hasegawa, T, Hazumi, M, Ishii, T, Kasai, S, Kuze, M, Mine, S, Nagasawa, Y, Nagira, T, Nakao, M, Okuno, H, Suzuki, I, Tokushuku, K, Yamada, S, Yamazaki, Y, Chiba, M, Hamatsu, R, Hirose, T, Homma, K, Kitamura, S, Nagayama, S, Nakamitsu, Y, Cirio, R, Costa, M, Ferrero, Mi, Lamberti, L, Maselli, S, Peroni, C, Solano, A, Sacchi, R, Staiano, A, Dardo, M, Bailey, Dc, Bandyopadhyay, D, Benard, F, Bhadra, S, Brkic, M, Burow, Bd, Chlebana, F, Crombie, Mb, Hartner, Gf, Levman, Gm, Martin, Jf, Orr, R, Prentice, Jd, Sampson, Cr, Stairs, Gg, Teuscher, Rj, Yoon, T, Bullock, Fw, Catterall, Cd, Giddings, Jc, Jones, Tw, Khan, Am, Lane, Jb, Makkar, Pl, Shaw, D, Shulman, J, Blankenship, K, Kochocki, J, Lu, B, Mo, Lw, Charchula, K, Ciborowski, J, Gajewski, J, Grzelak, G, Kasprzak, M, Krzyzanowski, M, Muchorowski, K, Nowak, Rj, Pawlak, Jm, Stopczynski, A, Tymieniecka, T, Walczak, R, Wroblewski, Ak, Zakrzewski, Ja, Zarnecki, Af, Adamus, M, Abramowicz, H, Eisenberg, Y, Glasman, C, Karshon, U, Montag, A, Revel, D, Shapira, A, Foudas, C, Fordham, C, Loveless, Rj, Goussiou, A, Ali, I, Behrens, B, Dasu, S, Reeder, Dd, Smith, Wh, Silverstein, S, Frisken, Wr, Furutani, Km, and Iga, Y.

Subjects
structure functions, deep inelastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), ZEUS (particle detector), Proton, E+E-PHYSICS, Scattering, LUND MONTE-CARLO, DESY, Elementary particle, ZEUS, HERA, Deep inelastic scattering, QCD, lcsh:QC1-999, JET FRAGMENTATION, Nuclear physics, MODEL, INELASTIC MUON SCATTERING, lcsh:Physics
Abstract

This paper presents our first measurement of the F 2 structure function in neutral-current, deep inelastic scattering using the ZEUS detector at HERA, the ep colliding beam facility at DESY. The data correspond to an integrated luminosity of 24.7 nb −1 . Results are presented for data in range of Q 2 from 10 GeV 2 to 4700 GeV 2 and Bjorken x down to 3.0 × 10 −4 . The F 2 structure function increases rapidly as x decreases.

Published
1993

44. Search for excited electrons using the ZEUS detector

Author

J. F. Martin, Fernando Barreiro, Mauro Morandin, Z. Jakubowski, J. Mollen, M. Iori, Guenter Wolf, A. Bernstein, Y. Zamora Garcia, E.N. Kuznetsov, Marcel Vreeswijk, O. Mańczak, G. F. Hartner, Nicolo Cartiglia, S. Yang, R.S. Gilmore, R. Casaccia, J. F. Labs, J. Kochocki, Rosario Nania, F. J. Sciulli, A. Freidhof, B. Lu, L. W. Hung, A. Bargende, Danuta Kisielewska, James Crittenden, A. Prinias, D. Revel, A. A. Voronin, H.F. Sadronzinski, R.J. Tapper, H.J. Grabosch, E. Rulikowska-Zarȩbska, J.A. Zakrzewski, A Furtjes, F. Gasparini, W. Koch, S.S. Wilson, T. Y. Kim, S. Mengel, C. Raine, A. Stopczyński, C. Youngman, S.H. An, J. Mainusch, J. Leslie, Tadeusz Kowalski, T. Watanabe, A. Meyer, Roberto Carlin, B. Gutjahr, A. Dannemann, D. Monaldi, M. Mattioli, G. Poelz, Eduardo Ros, R. J. Cashmore, D. Schramm, C. A. Heusch, Lothar At Bauerdick, Lucia Votano, C. Rethfeldt, W. Schott, Cd Catterall, S. Nagayama, A. Montag, M. Kückes, J. Bulmahn, Luis Labarga, F. W. Bullock, E. Lohrmann, F. Ikraiam, M. Derrick, F. Arzarello, H. Kreutzmann, J. Del Peso, T. Tymieniecka, Mariusz Flasiński, L.E. Sinclair, Marco Schioppa, P. G. Pelfer, S.J.P. Smith, A. Byrne, F.S. Chlebana, K.M. Furutani, K. U. Pösnecker, U. Kötz, B. Hubbard, M.B. Crombie, R. Seidlein, K. Wick, A. Mass, Q. Lin, S. Kartik, Thomas Trefzger, W. Schulz, A. Shapira, Vivian O'Dell, Aharon Levy, T.J. Llewellyn, J. N. Lim, C. O. Kim, J. Ciborowski, R. Ullmann, R. Yoshida, S. Nickel, B.D. Burow, D. B. Miller, T. Kȩdzierski, R. Gläser, V. K. Nadendla, R. J. Nowak, Francois Corriveau, J. M. Pawlak, M. Dardo, J. Gajewski, C. Coldewey, B. Krebs, H.G.J.M. Tiecke, F. Benard, K. Muchorowski, Giuseppe Iacobucci, K. Prytz, D. Lüke, B. Löhr, Giuseppe Levi, I. Ali, R. Wedemeyer, G. Jahnen, Claudia Glasman, P. Joos, P. Giusti, D. Zer-Zion, M. Basile, B. Foster, J.-L. Schneider, W. Vogel, H. Brückmann, R. Stanek, Helen F Heath, Wr Frisken, M. H. Suh, G. Drews, J. A. Parsons, T. Massam, Luisa Cifarelli, L. K. Gladilin, Neville Harnew, J. Biltzinger, J.K. Mayer, W. Hain, P. Luffman, Luca Stanco, P. Göttlicher, A. Kotański, P. Morawitz, I. Fleck, D. Shaw, H. Hultschig, I. H. Park, J. K. Sedgbeer, K. Eskreys, H. Kammerlocher, E. Barberis, Tobias M. Haas, John Hart, S. Kasai, J. F. de Trocóniz, Ben Bylsma, J. Milewski, J. Krüger, U. Mallik, T. Khatri, J.W. Mitchell, T. Poser, T.P. Shah, D. Haun, T. Bienz, G. Bruni, D. H. Saxon, Greg P Heath, L. Zawiejski, Roberto Cirio, P. de Jong, B. Lisowski, R.C.E. Devenish, J.B. Lane, J. Zaja̧c, G. Laurenti, H. Hartmann, Rr Rau, B. Nizioł, A. Contin, L. Köpke, L. Bellagamba, A. Eskreys, M. Rohde, J. Nash, M.A.J. Botje, K. Jeleń, I. Butterworth, Douglas Gingrich, B. Musgrave, S. K. Park, A.H. Walenta, F. Palmonari, Amedeo Staiano, M. St.Laurent, F. Selonke, E. Hilger, Y. Iga, H. Müsch, E. Paul, Ulf Behrens, Federico Cindolo, M. Krzyżanowski, H. Kowalski, Sridhara Dasu, F. Ciralli, A. Cassidy, B.Y. Oh, M. Nakahata, Halina Abramowicz, L. Hagge, Y. Eisenberg, J. Whitmore, T. Ishii, C. Li, K. Heinloth, Giuseppe Barbagli, N. Dyce, R. Meijer Drees, C.J.S. Morgado, C. Voci, S. Bhadra, C. Fordham, Michele Arneodo, N.C. Roocroft, G. Castellini, U. Schneekloth, T. Neumann, T. Barillari, C. Memoz, Silvia Maselli, M. Momayezi, M. Zachara, T. Doeker, S. Kramarczyk, Ta Romanowski, Hiroshi G. Okuno, F. F. Wilson, S. Kitamura, M. Chiarini, G. Sartorelli, R. Timellini, A. Dake, N. H. Brook, V. L. Harris, Jonathan Butterworth, S. Yamada, L. S. Durkin, Ada Solano, P.M. Patel, A. A. Savin, R. Walczak, M. Adamus, G. Marini, A.K. Wróblewski, A. Bamberger, L. Suszycki, S. Limentani, R. R. McNeil, K. Charchuła, W.N. Murray, G. Anzivino, A. Bruni, A. Zichichi, Matthias Kasemann, M. Löwe, M. Nakao, P. Borzemski, D. Notz, Samuel Silverstein, G.A. Blair, M. Brkic, S. H. Yon, M. Lancaster, D. Krakauer, T. W. Jones, Anna Goussiou, D.D. Reeder, G. D'Agostini, B. Diekmann, Stan Bentvelsen, G. L. Bashindzhagyan, N. P. Zotov, W. Kröger, R. J. Teuscher, T. Y. Ling, G. Zech, Amanda Cooper-Sarkar, R. J. Seifert, Giovanni Abbiendi, Robert Klanner, A. Vorvolakos, G. Feild, Stefano Maria Mari, P. Erhard, Jens Hartmann, T.L. Short, Efstathios Stiliaris, S. Böttcher, Y. Nagasawa, L. Lamberti, H. Uijterwaal, P.F. Ermolov, M. de Kamps, P.M. Kooijman, D. K. Hasell, E. Gallo, K. O'Shaughnessy, S. Dagan, H. J. Kim, K. Honscheid, Yu. A. Golubkov, A. Francescato, M. Posocco, Geoffrey Smith, Giovanni Maccarrone, A. Kruse, J. K. Bienlein, S. Schlenstedt, P. J. Bussey, J. Shulman, F. Dal Corso, T. Hasegawa, A. Leich, P. Cloth, P.M. Hallam-Baker, R. Imlay, G. Grzelak, Af Zarnecki, Debades Bandyopadhyay, C. Del Papa, Juan Terron, M. Kasprzak, S. Magill, T. C. Bacon, G. Cases, E. Tscheslog, S. M. Hong, S. De Pasquale, R. L. Talaga, S. Qian, I. Gialas, M. Nuti, J. Schroeder, R. S. Orr, P. B. Straub, B. Behrens, G. Bari, M.I. Ferrero, V.A. Jamieson, B. Bednarek, R. Beuselinck, T. S. Yoon, H. van der Lugt, F. Zetsche, H.-P. Jakob, J. L. Thron, Masashi Hazumi, R. Brugnera, V. A. Kuzmin, D. C. Bailey, M. De Giorgi, D. J. Gilkinson, Gm Levman, P. Filges, W. Metcalf, E. Badura, U. Holm, N. A. McCubbin, Y. Nakamitsu, Katsuo Tokushuku, N. Pavel, Umberto Dosselli, S. W. Nam, David Cussans, Janusz Chwastowski, William S. Lockman, E. A. De Wolf, Krzysztof Piotrzkowski, J.J. Engelen, Kr Long, A.G. Tenner, S. Ritz, D. S. Hanna, Tachishige Hirose, Anselmo Margotti, L.W. Wiggers, G.G. Stairs, T. Tsurugai, M. Kuze, E. McCliment, J. Roldán, R. Hamatsu, J.C. Giddings, A. Seiden, Michele Guida, Jose Repond, M. Przybycień, L. Wai, Meng Wang, R. van Woudenberg, S. Repond, A. T. Doyle, A.M. Khan, W. H. Smith, G. Gloth, R. Schattevoy, Masami Chiba, P.L. Makkar, R. Stroili, Mário Costa, U. Contino, Klaus Kurt Desch, C. Peroni, R. Ayad, M. Roco, G. Cara Romeo, G. Geitz, G. Theisen, U. Karshon, Luis Hervas, D. Boscherini, G. Susinno, Saverio D'Auria, J.S.T. Ng, I. McArthur, P. Bruni, Costas Foudas, L.W. Mo, Dg Stairs, A. Caldwell, F. Frasconi, J. Malos, J.R. Forbes, K.W. McLean, A. Ladage, S. Söldner-Rembold, A. Nigro, A. Dwuraźny, A.F. Whitfield, J.D. Prentice, R. Loveless, M. Geerts, K. Blankenship, C.R. Sampson, H. Dabbous, Derrick, M, Krakauer, D, Magill, S, Musgrave, B, Repond, J, Repond, S, Stanek, R, Talaga, Rl, Thron, J, Arzarello, F, Ayad, R, Bari, G, Basile, M, Bellagamba, L, Boscherini, D, Bruni, A, Bruni, G, Bruni, P, Romeo, Gc, Castellini, G, Chiarini, M, Cifarelli, L, Cindolo, F, Ciralli, F, Contin, A, Lin, Q, Lisowski, B, Maccarrone, G, Margotti, A, Massam, T, Nania, R, Nemoz, C, Palmonari, F, Sartorelli, G, Timellini, R, Garcia, Yz, Zichichi, A, Bargende, A, Crittenden, J, Dabbous, H, Desch, K, Diekmann, B, Doeker, T, Geerts, M, Geitz, G, Hartmann, H, Haun, D, Heinloth, K, Hilger, E, Jakob, Hp, Kramarczyk, S, Kuckes, M, Mass, A, Mengel, S, Mollen, J, Monaldi, D, Musch, H, Paul, E, Schattevoy, R, Schneider, Jl, Schramm, D, Wedemeyer, R, Cassidy, A, Cussans, Dg, Dyce, N, Foster, B, Gilmore, R, Heath, Gp, Heath, Hf, Lancaster, M, Llewellyn, Tj, Malos, J, Morgado, Cj, Tapper, Rj, Wilson, S, Yoshida, R, Rau, Rr, Arneodo, M, Barillari, T, Schioppa, M, Susinno, G, Bernstein, A, Caldwell, A, Gialas, I, Parsons, Ja, Ritz, S, Sciulli, F, Straub, Pb, Wai, L, Yang, S, Chwastowski, J, Dwurazny, A, Eskreys, A, Jakubowski, Z, Niziol, B, Piotrzkowski, K, Zachara, M, Zawiejski, L, Bednarek, B, Borzemski, P, Eskreys, K, Jelen, K, Kisielewska, D, Kowalski, T, Rulikowskazarebska, E, Suszycki, L, Zajac, J, Kedzierski, T, Kotanski, A, Przybycien, M, Bauerdick, Lat, Behrens, U, Bienlein, Jk, Bottcher, S, Coldewey, C, Dannemann, A, Drews, G, Erhard, P, Flasinski, M, Fleck, I, Glaser, R, Gottlicher, P, Gutjahr, B, Haas, T, Hagge, L, Hain, W, Hasell, D, Hultschig, H, Jahnen, G, Joos, P, Kasemann, M, Klanner, R, Koch, W, Kopke, L, Kotz, U, Kowalski, H, Kruger, J, Labs, J, Ladage, A, Lohr, B, Lowe, M, Luke, D, Mainusch, J, Manczak, O, Momayezi, M, Ng, Jst, Nickel, S, Notz, D, Posnecker, Ku, Rohde, M, Roldan, J, Ros, E, Schneekloth, U, Schroeder, J, Schulz, W, Selonke, F, Stiliaris, E, Tscheslog, E, Tsurugai, T, Vogel, W, Wolf, G, Youngman, C, Grabosch, Hj, Leich, A, Meyer, A, Rethfeldt, C, Schlenstedt, S, Barbagli, G, Francescato, A, Nuti, M, Pelfer, P, Anzivino, G, Casaccia, R, Depasquale, S, Qian, S, Votano, L, Bamberger, A, Freidhof, A, Kroger, W, Poser, T, Soldnerrembold, S, Theisen, G, Trefzger, T, Brook, Nh, Bussey, Pj, Doyle, At, Forbes, Jr, Jamieson, Va, Raine, C, Saxon, Dh, Bruckmann, H, Gloth, G, Holm, U, Kammerlocher, H, Krebs, B, Neumann, T, Wick, K, Furtjes, A, Lohrmann, E, Milewski, J, Nakahata, M, Pavel, N, Poelz, G, Schott, W, Terron, J, Zetsche, F, Bacon, Tc, Beuselinck, R, Butterworth, I, Gallo, E, Harris, Vl, Miller, Db, Prinias, A, Sedgbeer, Jk, Vorvolakos, A, Whitfield, A, Bienz, T, Kreutzmann, H, Mallik, U, Mccliment, E, Roco, M, Wang, Mz, Cloth, P, Filges, D, An, Sh, Hong, Sm, Kim, Co, Kim, Ty, Nam, Sw, Park, Sk, Suh, Mh, Yon, Sh, Imlay, R, Kartik, S, Kim, Hj, Mcneil, Rr, Metcalf, W, Nadendla, Vk, Barreiro, F, Cases, G, Hervas, L, Labarga, L, Delpeso, J, Detroconiz, Jf, Ikraiam, F, Mayer, Jk, Smith, Gr, Corriveau, F, Gilkinson, Dj, Hanna, D, Hartmann, J, Hung, Lw, Lim, Jn, Drees, Rm, Mitchell, Jw, Patel, Pm, Sinclair, Le, Stairs, Dg, Stlaurent, M, Ullmann, R, Bashindzhagyan, Gl, Ermolov, Pf, Gladilin, Lk, Golubkov, Ya, Kuzmin, Va, Kuznetsov, En, Savin, Aa, Voronin, Ag, Zotov, Np, Bentvelsen, S, Botje, M, Dake, A, Engelen, J, Dejong, P, Dekamps, M, Kooijman, P, Kruse, A, Vanderlugt, H, Odell, V, Tenner, A, Tiecke, H, Uijterwaal, H, Vreeswijk, M, Wiggers, L, Dewolf, E, Vanwoudenberg, R, Bylsma, B, Durkin, L, Honscheid, K, Li, C, Ling, Ty, Mclean, Kw, Murray, Wn, Park, Ih, Romanowski, Ta, Seidlein, R, Blair, Ga, Byrne, A, Cashmore, Rj, Coopersarkar, Am, Devenish, Rce, Gingrich, Dm, Hallambaker, Pm, Harnew, N, Khatri, T, Long, Kr, Luffman, P, Mcarthur, I, Morawitz, P, Nash, J, Smith, Sjp, Roocroft, Nc, Wilson, Ff, Abbiendi, G, Brugnera, R, Carlin, R, Dalcorso, F, Degiorgi, M, Dosselli, U, Gasparini, F, Limentani, S, Morandin, M, Posocco, M, Stanco, L, Stroili, R, Voci, C, Butterworth, Jm, Bulmahn, J, Feild, G, Oh, By, Whitmore, J, Contino, U, Dagostini, G, Guida, M, Iori, M, Mari, Stefano Maria, Marini, G, Mattioli, M, Nigro, A, Hart, Jc, Mccubbin, Na, Prytz, K, Shah, Tp, Short, Tl, Barberis, E, Cartiglia, N, Heusch, C, Hubbard, B, Leslie, J, Lockman, W, Oshaughnessy, K, Sadrozinski, Hf, Seiden, A, Zerzion, D, Badura, E, Biltzinger, J, Seifert, Rj, Walenta, Ah, Zech, G, Dagan, S, Levy, A, Hasegawa, T, Hazumi, M, Ishii, T, Kasai, S, Kuze, M, Nagasawa, Y, Nakao, M, Okuno, H, Tokushuku, K, Watanabe, T, Yamada, S, Chiba, M, Hamatsu, R, Hirose, T, Kitamura, S, Nagayama, S, Nakamitsu, Y, Cirio, R, Costa, M, Ferrero, Mi, Lamberti, L, Maselli, S, Peroni, C, Solano, A, Staiano, A, Dardo, M, Bailey, Dc, Bandyopadhyay, D, Benard, F, Bhadra, S, Brkic, M, Burow, Bd, Chlebana, F, Crombie, Mb, Hartner, Gf, Levman, Gm, Martin, Jf, Orr, R, Prentice, Jd, Sampson, Cr, Stairs, Gg, Teuscher, Rj, Yoon, T, Bullock, Fw, Catterall, Cd, Giddings, Jc, Jones, Tw, Khan, Am, Lane, Jb, Makkar, Pl, Shaw, D, Shulman, J, Blankenship, K, Kochocki, J, Lu, B, Mo, Lw, Charchula, K, Ciborowski, J, Gajewski, J, Grzelak, G, Kasprzak, M, Krzyzanowski, M, Muchorowski, K, Nowak, Rj, Pawlak, Jm, Stopczynski, A, Tymieniecka, T, Walczak, R, Wroblewski, Ak, Zakrzewski, Ja, Zarnecki, Af, Adamus, M, Abramowicz, H, Eisenberg, Y, Glasman, C, Karshon, U, Montag, A, Revel, D, Shapira, A, Foudas, C, Fordham, C, Loveless, Rj, Goussiou, A, Ali, I, Behrens, B, Dasu, S, Reeder, Dd, Smith, Wh, Silverstein, S, Frisken, Wr, Furutani, Km, Iga, Y, and RI De Pasquale Salvatore/B 9165 2008 Lancaster Mark/C 1693 2008 Doyle Anthony/C 5889 2009 Gladilin Leonid/B 5226 2011 Golubkov Yury/E 1643, 2012

Subjects
Nuclear and High Energy Physics, Particle physics, LUND MONTE-CARLO, LEPTON PRODUCTION, Astrophysics::High Energy Astrophysical Phenomena, Electron, excited electrons, electron proton collider, JET FRAGMENTATION, law.invention, MUONS, Nuclear physics, LIMITS, ZEUS, CENTRAL TRACKING DETECTOR, E+E-PHYSICS, Z0 DECAY, GAMMA-GAMMA%22">E+E-->GAMMA-GAMMA, CALORIMETER, law, Collider, Nuclear Experiment, Physics, Muon, ZEUS (particle detector), Luminosity (scattering theory), Compton scattering, HERA, Excited state, High Energy Physics::Experiment
Abstract

This paper reports a search for excited electrons at the HERA electron-proton collider. In a sample corresponding to an integrated luminosity of 26 nb−, no evidence was found for any resonant state decaying into e−γ, νW− or e−Z0. Limits on the coupling strength of an excited electron have been determined for masses between 45 and 225 GeV. This study also reports the observation of the wide-angle eγ Compton scattering process.

Published
1993

45. Function Identification in Neuron Populations via Information Bottleneck.

Author

Buddha, S. Kartik, So, Kelvin, Carmena, Jose M., and Gastpar, Michael C.

Subjects
*NEURONS, *CELL populations, *MATHEMATICAL functions, *INFORMATION theory, *SIGNAL processing, *RANDOM variables
Abstract

It is plausible to hypothesize that the spiking responses of certain neurons represent functions of the spiking signals of other neurons. A natural ensuing question concerns how to use experimental data to infer what kind of a function is being computed. Model-based approaches typically require assumptions on how information is represented. By contrast, information measures are sensitive only to relative behavior: information is unchanged by applying arbitrary invertible transformations to the involved random variables. This paper develops an approach based on the information bottleneck method that attempts to find such functional relationships in a neuron population. Specifically, the information bottleneck method is used to provide appropriate compact representations which can then be parsed to infer functional relationships. In the present paper, the parsing step is specialized to the case of remapped-linear functions. The approach is validated on artificial data and then applied to recordings from the motor cortex of a macaque monkey performing an arm-reaching task. Functional relationships are identified and shown to exhibit some degree of persistence across multiple trials of the same experiment. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

46. The A‐dependenc of ψ production in π− nucleus collisions at 530 GeV/c

Author

S. P. Denisov, J. Krider, Yu.M. Antipov, H. Goldberg, T. Sulanke, S. Petrukhin, V.V. Abramov, L. Dauwe, V. Kryshkin, C. Neyman, V. Glebov, K. Welch, R.M. Sulyaev, T. Bowyer, J. P. Martin, B. Baldin, Sergey S.A. Polovnikov, S. Kartik, R.R. Crittenden, V. Sirotenko, A. Zieminski, H. Xiao, G. Ludlam, J. Solomon, P.T. Smith, T. Marshall, S. Margulies, Yu.P. Gorin, Rapson Gomez, C. L. Davis, A. R. Dzierba, and V. I. Koreshev

Subjects
Physics, Particle physics, Muon, Spectrometer, Charged particle, Nuclear physics, Pion, Effective mass (solid-state physics), Mass spectrum, Physics::Accelerator Physics, High Energy Physics::Experiment, Fermilab, Multiplicity (chemistry), Nuclear Experiment
Abstract

The E672/E706 Spectrometer, located in the MW beam at Fermilab, was used to collect data on events containing a pair of muons in the final state with large effective mass. The momentum of incident pions and protons was 530 GeV/c. Nuclear targets included Be, C, Al, Cu and Pb. We report on a preliminary measurement of the A‐dependence of the per nucleus cross section for forward J/ψ production. The apparatus also detected charged particles and γ’s produced in association with the muon pair. The expected physics results on the hadroproduction of χ states and beauty particles are discussed.

Published
1988

47. Measurement of the reaction γ*p→φp in deep inelastic e+p scattering at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J.R. Okrasinski, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, M.C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli, Y.Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M.B. Przybycień, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, Z. Duliński, A. Kotański, G. Abbiendi, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, J. Milewski, T. Monteiro, J.S.T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner, H.J. Grabosch, A. Kharchilava, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, T. Trefzger, S. Wölfle, J.T. Bromley, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, L.E. Sinclair, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, R. Sinkus, K. Wick, B.D. Burow, L. Hagge, E. Lohrmann, N. Pavel, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Brümmer, I. Butterworth, V.L. Harris, G. Howell, B.H.Y. Hung, L. Lamberti, K.R. Long, D.B. Miller, A. Prinias, J.K. Sedgbeer, D. Sideris, A.F. Whitfield, U. Mallik, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, G.H. Cho, B.J. Ko, S.B. Lee, S.W. Nam, H.S. Park, S.K. Park, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, M. Riveline, D.G. Stairs, M. St-Laurent, R. Ullmann, G. Zacek, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C. Li, T.Y. Ling, P. Nylander, I.H. Park, T.A. Romanowski, D.S. Bailey, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin, J. Bulmahn, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, T.P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, J.I. Fleck, M. Inuzuka, T. Ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, F. Benard, M. Brkic, C.-P. Fagerstroem, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, D. Simmons, R.J. Teuscher, J.M. Butterworth, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, M.R. Sutton, B. Lu, L.W. Mo, W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, C. Coldewey, Y. Eisenberg, D. Hochman, U. Karshon, D. Revel, D. Zer-Zion, W.F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R.J. Loveless, S. Mattingly, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, M.L. Cardy, W.R. Frisken, M. Khakzad, W.N. Murray, and W.B. Schmidke

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Proton, 010308 nuclear & particles physics, Perturbative QCD, HERA, 7. Clean energy, 01 natural sciences, Zeus (malware), Gluon, Nuclear physics, Pomeron, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

The production of φ mesons in the reaction e+p → e+φp (φ → K+K−), for 7 Q 2 GeV 2 and virtual photon-proton centre of mass energies (W) in the range 42–134 GeV, has been studied with the ZEUS detector at HERA. When compared to lower energy data at similar Q 2, the results show that the γ ∗ p → φp cross section rises strongly with W. This behaviour is similar to that previously found for the γ ∗ p → ϱ 0 p cross section. This strong dependence cannot be explained by production through soft pomeron exchange. It is, however, consistent with perturbative QCD expectations, where it reflects the rise of the gluon momentum density in the proton at small x. The ratio of σ(φ) σ(ϱ 0 ) , which has previously been determined by ZEUS to be 0.065 ± 0.013 (stat.) in photoproduction at a mean W of 70 GeV, is measured to be 0.18 ± 0.05 (stat.) ± 0.03 (syst.) at a mean Q 2 of 12.3 GeV2 and mean W of ≈ 100 GeV and is thus approaching at large Q 2 the value of 2 9 predicted from the quark charges of the vector mesons and a flavour independent production mechanism.

48. Dijet angular distributions in direct and resolved photoproduction at HERA

Author

M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J.R. Okrasinski, J. Repond, R. Stanek, R.L. Talaga, H. Zhang, M.C.K. Mattingly, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, J. Crittenden, R. Deffner, T. Doeker, M. Eckert, L. Feld, A. Frey, M. Geerts, M. Grothe, H. Hartmann, K. Heinloth, L. Heinz, E. Hilger, H.-P. Jakob, U.F. Katz, S. Mengel, E. Paul, M. Pfeiffer, Ch. Rembser, D. Schramm, J. Stamm, R. Wedemeyer, S. Campbell-Robson, A. Cassidy, W.N. Cottingham, N. Dyce, B. Foster, S. George, M.E. Hayes, G.P. Heath, H.F. Heath, D. Piccioni, D.G. Roff, R.J. Tapper, R. Yoshida, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J.A. Parsons, S. Ritz, F. Sciulli, P.B. Straub, L. Wai, S. Yang, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M.B. Przybycień, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, Z. Duliński, A. Kotański, G. Abbiendi, L.A.T. Bauerdick, U. Behrens, H. Beier, J.K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, M. Flasiński, D.J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K.F. Johnson, P. Joos, M. Kasemann, R. Klanner, W. Koch, U. Kötz, H. Kowalski, J. Labs, A. Ladage, B. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, J. Milewski, T. Monteiro, J.S.T. Ng, D. Notz, K. Ohrenberg, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner, H.J. Grabosch, A. Kharchilava, S.M. Mari, A. Meyer, S. Schlenstedt, N. Wulff, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, S. De Pasquale, L. Votano, A. Bamberger, S. Eisenhardt, T. Trefzger, S. Wölfle, J.T. Bromley, N.H. Brook, P.J. Bussey, A.T. Doyle, D.H. Saxon, L.E. Sinclair, M.L. Utley, A.S. Wilson, A. Dannemann, U. Holm, D. Horstmann, R. Sinkus, K. Wick, B.D. Burow, L. Hagge, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche, T.C. Bacon, N. Brümmer, I. Butterworth, V.L. Harris, G. Howell, B.H.Y. Hung, L. Lamberti, K.R. Long, D.B. Miller, N. Pavel, A. Prinias, J.K. Sedgbeer, D. Sideris, A.F. Whitfield, U. Mallik, M.Z. Wang, S.M. Wang, J.T. Wu, P. Cloth, D. Filges, S.H. An, G.H. Cho, B.J. Ko, S.B. Lee, S.W. Nam, H.S. Park, S.K. Park, S. Kartik, H.-J. Kim, R.R. McNeil, W. Metcalf, V.K. Nadendla, F. Barreiro, J.P. Fernandez, R. Graciani, J.M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. del Peso, J. Puga, J. Terron, J.F. de Trocóniz, F. Corriveau, D.S. Hanna, J. Hartmann, L.W. Hung, J.N. Lim, C.G. Matthews, P.M. Patel, M. Riveline, D.G. Stairs, M. St-Laurent, R. Ullmann, G. Zacek, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, A. Stifutkin, G.L. Bashindzhagyan, P.F. Ermolov, L.K. Gladilin, Yu.A. Golubkov, V.D. Kobrin, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, A.A. Savin, L.M. Shcheglova, A.N. Solomin, N.P. Zotov, M. Botje, F. Chlebana, J. Engelen, M. de Kamps, P. Kooijman, A. Kruse, A. van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C. Li, T.Y. Ling, P. Nylander, I.H. Park, T.A. Romanowski, D.S. Bailey, R.J. Cashmore, A.M. Cooper-Sarkar, R.C.E. Devenish, N. Harnew, M. Lancaster, L. Lindemann, J.D. McFall, C. Nath, V.A. Noyes, A. Quadt, J.R. Tickner, H. Uijterwaal, R. Walczak, D.S. Waters, F.F. Wilson, T. Yip, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, F. Zuin, J. Bulmahn, R.G. Feild, B.Y. Oh, J.J. Whitmore, G. D'Agostini, G. Marini, A. Nigro, E. Tassi, J.C. Hart, N.A. McCubbin, T.P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J.T. Rahn, H.F.-W. Sadrozinski, A. Seiden, D.C. Williams, J. Biltzinger, R.J. Seifert, O. Schwarzer, A.H. Walenta, G. Zech, H. Abramowicz, G. Briskin, S. Dagan, A. Levy, J.I. Fleck, M. Inuzuka, T. ishii, M. Kuze, S. Mine, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, C. Peroni, R. Sacchi, A. Solano, A. Staino, M. Dardo, D.C. Bailey, F. Benard, M. Brkic, C.-P. Fagerstroem, G.F. Hartner, K.K. Joo, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, C.R. Sampson, D. Simmons, R.J. Teuscher, J.M. Butterworth, C.D. Catterall, T.W. Jones, P.B. Kaziewicz, J.B. Lane, R.L. Saunders, J. Shulman, M.R. Sutton, B. Lu, L.W. Mo, W. Bogusz, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyżanowski, K. Muchorowski, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, C. Coldewey, Y. Eisenberg, D. Hochman, U. Karshon, D. Revel, D. Zer-Zion, W.F. Badgett, J. Breitweg, D. Chapin, R. Cross, S. Dasu, C. Foudas, R.J. Loveless, S. Mattingly, D.D. Reeder, S. Silverstein, W.H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, M.L. Cardy, W.R. Frisken, M. Khakzad, W.N. Murray, W.B. Schmidke, and ZEUS at HERA (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, COLLISIONS, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Jet (particle physics), PPBAR COLLIDER, PROTON, 01 natural sciences, 7. Clean energy, law.invention, CROSS-SECTIONS, High Energy Physics - Experiment, Nuclear physics, EVENTS, High Energy Physics - Experiment (hep-ex), GAMMA-P INTERACTIONS, MONTE-CARLO, law, 0103 physical sciences, Invariant mass, 010306 general physics, Collider, Nuclear Experiment, Quantum chromodynamics, Physics, ZEUS (particle detector), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, ZEUS, ZEUS BARREL CALORIMETER, HERA, Rest frame, Gluon, PARTON DISTRIBUTIONS, HARD SCATTERING, High Energy Physics::Experiment
Abstract

Jet photoproduction, where the two highest transverse energy ($\ETJ$) jets have $\ETJ$ above 6 GeV and a jet-jet invariant mass above 23~GeV, has been studied with the ZEUS detector at the HERA $ep$ collider. Resolved and direct photoproduction samples have been separated. The cross section as a function of the angle between the jet-jet axis and the beam direction in the dijet rest frame has been measured for the two samples. The measured angular distributions differ markedly from each other. They agree with the predictions of QCD calculations, where the different angular distributions reflect the different spins of the quark and gluon exchanged in the hard subprocess., 20 pages including 4 figures

49. Study of D* (2010)± production in ep collisions at HERA

Author

A. Nigro, Yasunori Yamazaki, J. Kochocki, B. Gutjahr, H. Hultschig, John Hart, L. M. Shcheglova, A. Prinias, D. Haun, E. Barberis, A. N. Solomin, U. Mallik, R. R. McNeil, K. Desler, M. Lancaster, W. Koch, F. Selonke, E. Hilger, A.F. Whitfield, S.M. Mari, J.T. Wu, K. Charchuła, Giuseppe Iacobucci, M. Krzyżanowski, W. Metcalf, H. Beier, Tadeusz Kowalski, J. Große-Knetter, A. Bruni, D. Daniels, U. Holm, B.Y. Oh, M. Löwe, Y Zhang, D.D. Reeder, B. Diekmann, M. Wodarczyk, G. Poelz, J. Mollen, J. Zaja̧c, P. B. Kaziewicz, L. Köpke, L. Lamberti, H. Uijterwaal, Lutz Feld, J. J. Whitmore, C. Li, Rosario Nania, Sung Keun Park, Nicolo Cartiglia, N. Pavel, I. Suzuki, G.R. Smith, Krzysztof Piotrzkowski, P. Bruni, Costas Foudas, J.F. Zhou, Christian Nemoz, Giancarlo Susinno, Vladimir Bashkirov, L.W. Mo, K. K. Joo, Y. Iga, Cristiana Peroni, N. Dyce, A. Meyer, G. Briskin, Mariusz Przybycien, M. Corradi, Tobias M. Haas, William S. Lockman, G. Grzelak, Matthias Kasemann, K. M. Furutani, D. Westphal, D. Notz, R. J. Cashmore, S. Nickel, M. Derrick, D. B. Miller, C. Voci, B. Surrow, S.H. An, T. Tymieniecka, M. Zachara, S. Mengel, J. Mainusch, D. Schramm, C. A. Heusch, Ada Solano, R. S. Orr, R.S. Gilmore, H.J. Grabosch, S. H. Yon, T. W. Jones, Anna Goussiou, G. L. Bashindzhagyan, N. P. Zotov, W.B. Schmidke, R. J. Teuscher, Shoichi Yamada, R.C.E. Devenish, Avto Kharchilava, W. Schott, Cd Catterall, T. C. Bacon, U. Kötz, A. Dannemann, H.G.J.M. Tiecke, F. Benard, O. Mańczak, G. F. Hartner, Roberto Carlin, Q. Zhu, I. Fleck, U. Karshon, J.B. Lane, Gy. Wolf, Rr Rau, J.A. O'Mara, Marcel Vreeswijk, S. Limentani, Kenneth Long, K. Wick, S. De Pasquale, Luis Hervas, S. Ritz, D. Boscherini, Marco Schioppa, S. Magill, J. Gajewski, B. Behrens, O. Deppe, T. Doeker, A. Caldwell, M. Roco, J.D. McFall, V. K. Nadendla, R. J. Nowak, G. Bari, G. Laurenti, J. Del Peso, P. G. Pelfer, J. Repond, Masashi Hazumi, G. Castellini, R.L. Talaga, T. Tsurugai, K. Ohrenberg, M. Van Hook, L.E. Sinclair, S.S. Wilson, P. Luffman, A. Frey, A. Bertolin, B. Bednarek, P.F. Ermolov, C. Rembser, J. Bulmahn, K.W. McLean, P.B. Straub, H. Zhang, H.-P. Jakob, A. Ladage, S. Söldner-Rembold, K. Homma, Samuel Silverstein, R. L. Saunders, J. F. Martin, M.B. Crombie, R. Seidlein, E. Lohrmann, J.S.T. Ng, M. Basile, W. H. Smith, P. Giusti, M. Brkic, E. Badura, D. Zer-Zion, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, A. Byrne, Fernando Barreiro, Robert Stanek, A. Mass, N. Wulff, P. Joos, J. Stamm, F. Zetsche, E. Stiliaris, K. Eskreys, I. Gialas, M.C.K. Mattingly, L. S. Durkin, R. Yoshida, L. Wai, J. Schroeder, R. Brugnera, R. Hamatsu, J. Puga, N. A. McCubbin, V. A. Kuzmin, D. C. Bailey, Cg Matthews, Luca Stanco, Mário Costa, D. Hasell, G. Zacek, Mauro Morandin, G. D'Agostini, M. Z. Wang, B. Foster, S. Bhadra, J. K. Sedgbeer, R. Imlay, L. W. Hung, T. Y. Ling, T. Yip, Jens Hartmann, L. Iannotti, M. De Giorgi, C. Youngman, Y. Zamora Garcia, V. D. Kobrin, T. Dubbs, Y. Nakamitsu, Katsuo Tokushuku, T.P. Shah, S. M. Wang, Ulf Behrens, F.S. Chlebana, Federico Cindolo, W. Bogusz, S. Eisenhardt, W. Hain, L. Lindemann, G. Bruni, Simon George, Umberto Dosselli, R. J. Seifert, Giovanni Abbiendi, I. H. Park, Tachishige Hirose, D. H. Saxon, T. Voß, A. Bargende, J. M. Pawlak, G.A. Blair, Leszek Adamczyk, M.I. Ferrero, M. Adamus, G. Marini, A.K. Wróblewski, A. Bamberger, Masami Chiba, D. Mikunas, Janusz Chwastowski, Klaus Kurt Desch, Luisa Cifarelli, A. M. Cooper-Sarkar, L. K. Gladilin, Neville Harnew, S. Dagan, W. Schulz, Robert Klanner, A. Vaiciulis, E. Tassi, Gm Levman, Djp Norman, I. Ali, Ben Bylsma, J. Milewski, A. Quadt, E. A. De Wolf, J. Biltzinger, H. Hartmann, D. S. Bailey, M. Khakzad, M. L. Cardy, P. Göttlicher, K. Honscheid, Yu. A. Golubkov, Y. Eisenberg, M.A.J. Botje, R. G. Feild, D. Krakauer, K. Yamauchi, H. Kowalski, M. Eckert, L. Bellagamba, M. St.Laurent, E. Paul, D.J. Gilkinson, M. Kuze, F. Dal Corso, S. Kartik, E. Rulikowska-Zarȩbska, Douglas Gingrich, Francois Corriveau, R. Walczak, H. F.W. Sadrozinski, Ricardo Graciani, K. Heinloth, Giuseppe Barbagli, L. Hagge, F. Sciulli, D. Revel, T. Hasegawa, J. Roldán, Roberto Sacchi, A. Leich, C. Glasman, B. Hubbard, C. P. Fagerstroem, F. Palmonari, A. Stifutkin, Sridhara Dasu, S. Mine, S Campbell-Robson, Halina Abramowicz, A.S. Proskuryakov, Giuseppe Levi, K. Muchorowski, W.F. Badgett, K. Jelen, T. Ishii, A. Kotański, L.A.T. Bauerdick, T.L. Short, R.J. Tapper, Amedeo Staiano, U. F. Katz, A. Freidhof, B. Lu, M. Posocco, W.R. Frisken, G. Sartorelli, Aharon Levy, T.J. Llewellyn, J. N. Lim, J. M. Hernandez, Debades Bandyopadhyay, J. K. Bienlein, R. van Woudenberg, G.P. Heath, M. de Kamps, B. Musgrave, D. Filges, R. Sinkus, S. W. Nam, R. Stroili, Antonino Zichichi, A. Bernstein, J.J. Engelen, P.M. Kooijman, U. Schneekloth, H. J. Kim, R. Wedemeyer, Giovanni Maccarrone, Thomas Trefzger, S. Schlenstedt, P. J. Bussey, A. Cassidy, I. Butterworth, M. Nakahata, D. S. Hanna, M. L. Utley, S. M. Hong, E. Gallo, Andrea Contin, James Crittenden, S. Yang, A. Kruse, Anselmo Margotti, P. Cloth, L.W. Wiggers, K. Prytz, Danuta Kisielewska, Ta Romanowski, T. Massam, E. McCliment, Y. Nagasawa, R. Ayad, H.F. Heath, G. Cases, T. Neumann, B. Löhr, A. Seiden, F. F. Wilson, J. A. Zakrzewski, M. Grothe, C.J.S. Morgado, Michele Arneodo, S. Kitamura, J. Ciborowski, M. Chiarini, J.A. Parsons, R. Ullmann, J. Shulman, Juan Terron, M. Kasprzak, Jonathan Butterworth, G. Cara Romeo, C. Fordham, A. Eskreys, Lucia Votano, A. T. Doyle, L. Labarga, Wouter Verkerke, C. Nath, H. Heßling, G. Geitz, B. Y. H. Hung, A. A. Savin, B. D. Burow, W.N. Murray, G. Anzivino, M. Nakao, P. Borzemski, G. Drews, G. Zech, M. Flasiński, R. Schattevoy, A.S. Wilson, M. Dardo, C. Coldewey, L. Suszycki, A. H. Walenta, B. A. Dolgoshein, P. Morawitz, Aleksander Filip Żarnecki, Silvia Maselli, D. Lüke, A. Polini, D. Acosta, Dg Stairs, D. Horstmann, R. Timellini, A. Dake, N. H. Brook, V. L. Harris, M. Rohde, R. Loveless, J. Labs, M. H. Suh, M. Geerts, K. Blankenship, C.R. Sampson, Jeffrey T. Rahn, P. M. Patel, V.A. Noyes, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, Proton, LUND MONTE-CARLO, photoproduction, charmed meson production, FOS: Physical sciences, 01 natural sciences, Zeus (malware), JET FRAGMENTATION, Charm quark, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), CHARM PHOTOPRODUCTION, GAMMA-P INTERACTIONS, 0103 physical sciences, Charm (quantum number), 010306 general physics, Quantum chromodynamics, Physics, ZEUS, LEADING-ORDER QCD, PARTON DISTRIBUTIONS, CROSS-SECTION, HARD SCATTERING, HEAVY QUARKS, E+E-PHYSICS, 010308 nuclear & particles physics, HERA, Gluon
Abstract

We report the first observation of charmed mesons with the ZEUS detector at HERA using the decay channel ${\rm D}^{*+}\rightarrow (\Do \rightarrow {\rm K}^-\pi^+)\pi^+$ (+ c.c.). Clear signals in the mass difference $\Delta M$=$M$(D$^*$)--$M$(D$^0)$ as well as in the $M(K\pi)$ distribution at the D$^0$ mass are found. The $ep$ cross section for inclusive \DSpm\ production with $Q^2, Comment: 19 pages, latex, 3 figures appended as uuencoded file

50. High-resolution esophageal manometry in systemic sclerosis in the indian population: An observational study

Author

S Kartik, Dharmendra Kumar, Gaurav Sikri, Deepanjan Dey, A B Srinivasa, and Binit Kumar

Subjects
esophageal motility disorder, high-resolution manometry, lower esophageal sphincter, systemic sclerosis, Diseases of the musculoskeletal system, RC925-935
Abstract

Background: Systemic sclerosis (SSc) is a rare multisystemic autoimmune disorder in which the esophagus is the second most common organ to be affected after the skin, leading to dysmotility. Literature available on esophageal dysmotility in SSc is limited. Moreover, studies explaining the spectrum of esophageal dysmotility in the disease in the Indian population are sparse. Aim: The aim of this study was to characterize esophageal motility disorders in SSc using esophageal high-resolution manometry (HRM) in a representative of the Southwestern Indian population. Methods: Thirty-two SSc patients participated in the study. All of them met the inclusion and exclusion criteria and underwent esophageal HRM at the Gastrointestinal Physiology Laboratory, Department of Physiology, of our center. The findings were interpreted using the Chicago Classification v3.0 criteria. Results: Among patients of SSc with a mean age of 42.25 ± 10.45 years, 19 (59.38%) had “absent contractility (AC),” 3 (9.38%) had “ineffective esophageal motility (IEM),” 3 (9.38%) had “type I achalasia, 1 (3.13%) had “esophagogastric junction outflow obstruction,” and 6 (18.75%) had “normal” HRM findings. The HRM parameter of “basal lower esophageal sphincter pressure” differed significantly between “IEM type I achalasia” (P = 0.043) and “type I achalasia AC” groups (P = 0.032), while “median integral relaxation pressure” of “type I achalasia” groups showed significant difference with “normal, IEM, and AC” groups each (P < 0.001). Conclusions: The findings of the study suggest that varying degrees of esophageal motility disorders are present in SSc using HRM as defined by the Chicago Classification v3.0. Majority (59.38%) of patients had AC, but the rest of them showed other dysmotility patterns.

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results