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12 results on '"F. Pelucchi"'

1. Measurement of the proton structure function F2 and σ at low and very low x at HERA

Author

Michele Arneodo, Ada Solano, S. Limentani, G. F. Susinno, M. St-Laurent, L. Suszycki, I. T. Lim, S. Bhadra, A. M. Cooper-Sarkar, S. Dagan, C. A. Heusch, Marco Schioppa, S. Magill, M. Khakzad, N.C. Brummer, Yu. A. Golubkov, E. Paul, P. G. Pelfer, A. Meyer-Larsen, S. Nam, T. Ishii, Costas Foudas, M. Posocco, J. Hartmann, E. Lohrmann, A. Bertolin, R. S. Orr, C. Voci, J. F. de Trocóniz, C. M. Ginsburg, R. Ayad, H.E. Blaikley, Mariusz Przybycien, M. Corradi, Kenneth Long, S. Ritz, L.W. Mo, H. Zhang, J. F. Martin, A. Caldwell, L. Zawiejski, Roberto Cirio, C.H. Bokel, J.A. Parsons, Y. Zamora Garcia, T. Voß, S. Polenz, F. Selonke, M. Zachara, E. Hilger, H.J. Grabosch, W.N. Cottingham, G. Bari, B. Lu, G. Cara Romeo, A. Meyer, J. Repond, H. F.W. Sadrozinski, K. Umemori, D.S. Hanna, Rosario Nania, Sung Keun Park, O. Deppe, R.C.E. Devenish, Q. Zhu, Giovanna Bruni, B. Bednarek, G. Laurenti, K. Coböken, A. Kotański, H.-P. Jakob, R. L. Saunders, U. Wollmer, L.K. Gladilin, A. Quadt, C. Coldewey, L. Lamberti, D. Simmons, L.A.T. Bauerdick, Marcel Vreeswijk, J.R. Okrasiński, Matthias Kasemann, D.G. Roff, F. Zetsche, M. L. Utley, Yuji Yamazaki, F. Pelucchi, A. Stifutkin, B. Mellado, James Crittenden, F. Dal Corso, Giuseppe Levi, R. Brugnera, John Hart, B. Surrow, Jongmin Lee, D. Kçira, L. Iannotti, R. Kerger, K. Jelen, R.L. Talaga, T. Yamashita, W.F. Badgett, W.R. Frisken, V. A. Kuzmin, D. C. Bailey, M. Grothe, L. Heinz, J. P. Fernandez, Ian Brock, H.F. Heath, L. Lindemann, J. Ciborowski, J. Del Peso, Giuseppe Barbagli, H. Salehi, D. Notz, J. A. Zakrzewski, S. Sampson, U. Schneekloth, J. Bulmahn, Katsuo Tokushuku, T. W. Jones, O. Ruske, M. Dardo, I. Butterworth, Y. Iga, M. Brkic, Gm Levman, Umberto Dosselli, M. Roco, O. Yu. Lukina, D. Epperson, A. Prinias, B.Y. Oh, Janusz Chwastowski, P. Nylander, K. K. Joo, S. Yamada, R. Yoshida, A. Polini, Elisabetta Gallo, D. S. Waters, K. Homma, D. Hasell, G. D'Agostini, B.D. Burow, Richard Hall-Wilton, J. Stamm, B. Foster, E. Strickland, M. Nakao, T. Y. Ling, Ta Romanowski, E. A. De Wolf, I. A. Korzhavina, J. R. Tickner, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, K. Yamauchi, W. Koch, O. Mańczak, P. Markun, G. F. Hartner, H. Beier, T.P. Shah, Tachishige Hirose, C. Amelung, Robert Klanner, A. Vaiciulis, U. Holm, S. Mattingly, R. Cross, M.E. Hayes, O. Schwarzer, J. Gilmore, Silvia Maselli, L.W. Hung, R. Stanek, J. M. Pawlak, Jonathan Butterworth, Tadeusz Kowalski, G. Poelz, A. Nigro, S. Eisenhardt, N. Tuning, Joanne Cole, S. A. Zotkin, J. Y. Kim, R. Pawlak, A. Garfagnini, W. Schott, Cd Catterall, U. Fricke, Fernando Barreiro, B. Löhr, Lucia Votano, Z. Duliński, C. Nath, J.D. McFall, C. L. Kim, T. Matsushita, I. Suzuki, K. Muchorowski, R. Waugh, G. Cases, Y. Eisenberg, S. Kitamura, A.F. Whitfield, M.C.K. Mattingly, L. S. Durkin, Mark Sutton, S. M. Wang, D. H. Saxon, R. Stroili, D.J. Gilkinson, Guillaume Garcia, R. Walczak, K. Heinloth, Pietro Antonioli, Luisa Cifarelli, Neville Harnew, Roberto Carlin, P. Göttlicher, J.N. Lim, G. Howell, R. Wedemeyer, J.K. Edmonds, D. Horstmann, D. Chapin, A.I. van Sighem, P.F. Ermolov, H. Wieber, J. Roldán, N. H. Brook, R. Hamatsu, V. L. Harris, K. Wick, Mauro Morandin, Z. Jakubowski, J. Puga, G. Sartorelli, M. Przybycien, K. Nagano, C. Youngman, M. Rohde, Luca Stanco, Lev Khein, R. Deffner, A.A. Savin, Krzysztof Piotrzkowski, J.T. Bromley, C. Rembser, M. Adamus, Danuta Kisielewska, G. Marini, T. Massam, E. Rulikowska-Zarȩbska, C. Glasman, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, G. Abbiendi, K. Desler, D. Acosta, Roberto Sacchi, M. Riveline, S. Kananov, J. K. Sedgbeer, D. Piccioni, P. Cloth, Cristiana Peroni, M. Kuze, R. J. Cashmore, J. Labs, M. Derrick, T. Tymieniecka, A. H. Walenta, N. A. McCubbin, U. Kötz, D.D. Reeder, D. Revel, M. Wodarczyk, D. Sideris, N. Gendner, F. Sciulli, J. Breitweg, F. Ricci, D. B. Miller, C.-P. Fagerstroem, Antonino Zichichi, J.J. Engelen, M. Basile, R. J. Nowak, Aharon Levy, A. Pellegrino, T. Haas, F. Anselmo, A. Pesci, A. N. Solomin, U. Mallik, Ben Bylsma, J. Milewski, Kurtis F Johnson, J. M. Hernandez, G.P. Heath, A. Bornheim, H. Park, H. Hartmann, J. Große-Knetter, P. Giusti, W. Liu, Laurel E. Sinclair, R.J. Tapper, Sridhara Dasu, S Campbell-Robson, Halina Abramowicz, F. Palmonari, P. B. Kaziewicz, K. Ohrenberg, H. Uijterwaal, V. Monaco, G. Drews, Giovanni Maccarrone, D. Hochman, W. Hain, S. Schlenstedt, P. J. Bussey, Thomas Trefzger, H.G.J.M. Tiecke, A. Seiden, T. Doeker, J.J. Ryan, W. H. Smith, Andrea Contin, Anselmo Margotti, J.H. Vossebeld, M. Lancaster, M. Raso, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, D. C. Williams, Mário Costa, B. A. Dolgoshein, T. Monteiro, L.W. Wiggers, J.T. Wu, A. Ochs, M. Inuzuka, Marcella Capua, F.S. Chlebana, D.S. Bailey, D. Westphal, J.I. Fleck, M. Eckert, N.A. Korotkova, L. Bellagamba, J. Zaja̧c, J.B. Lane, Gy. Wolf, J. T. Rahn, U. Karshon, Luis Hervas, D. Boscherini, A.S. Proskuryakov, A.F. Żarnecki, G. Briskin, G. Castellini, W.N. Murray, Detlef Filges, N. Pavel, M.A.J. Botje, N. Cartiglia, J.S.T. Ng, P.M. Kooijman, J. Shulman, Ricardo Graciani, Juan Terron, M. Kasprzak, P. Borzemski, S. Wölfle, Amedeo Staiano, U. F. Katz, R. Loveless, T. Fusayasu, M. Pfeiffer, A.S. Wilson, C.R. Sampson, Ulf Behrens, Federico Cindolo, H. Kowalski, R. Ullmann, V.A. Noyes, Miriam Lucio Martinez, S. B. Lee, B. Musgrave, D.G. Stairs, S.H. An, M. Y. Pac, M. C. Petrucci, T. Tsurugai, P.B. Straub, L. M. Shcheglova, Giuseppe Iacobucci, I. Bohnet, Tomohiro Abe, Z. Jing, B. H. Y. Hung, J. K. Bienlein, A. Bruni, M. Löwe, Enrico Tassi, J. J. Whitmore, Vladimir Bashkirov, F. Corriveau, G. Grzelak, T. C. Bacon, S. De Pasquale, I. Gialas, Inkyu Park, Leszek Adamczyk, M.I. Ferrero, D. Mikunas, R. G. Feild, and D. Krakauer

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), ZEUS (particle detector), Neutral current, Proton, 010308 nuclear & particles physics, Scattering, Structure function, HERA, 01 natural sciences, Calorimeter, Nuclear physics, 0103 physical sciences, 010306 general physics
Abstract

A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q 2 inelastic neutral current scattering, e+p → e+X, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton ( γ ∗ p ) cross-section is presented for 0.11 ≤ Q 2 ≤ 0.65 GeV2 and 2 × 10−6 ≤ x ≤ 6 × 10−5, corresponding to a range in the γ ∗ p c.m. energy of 100 ≤ W ≤ 230 GeV. Comparisons with various models are also presented.

Published
1997
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2. The CPLEAR detector at CERN

Author

K. Philippoussis, H. Verweij, G. Backenstoss, P. Bloch, G. Kesseler, A. Haselden, Andrej Filipcic, P. Pavlopoulos, F. Louis, D. Damianoglou, E. Rozaki, Panagiotis Kokkas, Dominique Durand, P.-R. Kettle, M. Bonnet, F. Bal, H.U. Johner, Claude Guyot, M. Steinacher, P. Petit, T. Alhalel, R.W. Hollander, Andras Kerek, Ch Yèche, D.A. Troster, L. Faravel, M. Mikuž, D. Francis, O. Behnke, B. Eckart, Sp. Dedoussis, J. Duclos, K. Sarigiannis, C. Engster, J.P. Bard, E. Gabathuler, M. Dedieu, R. Rickenbach, T. Ruf, Mats Danielsson, R. Adler, N. Dudragne, C. Jacobs, C.P. Marin, P. Weber, Ph. Schune, E. Machado, M. Schafer, V. Bertin, P.F. Harrison, H.-J. Gerber, F. Leimgruber, A. Schopper, K. Jansson, H. Martin, Christopher Bee, L. Sacks, Ioannis Evangelou, W.G. Heyes, P. Gumplinger, M. Dodgson, R. Le Gac, A. Ealet, T. Nakada, H. Postma, E. Hazen, L. Sakeliou, R. Daniel, Ch. Bula, E. Aslanides, Nikolaos Manthos, P Harrison, P.J. Hayman, W. Albrecht, F. Nanni, M. Chardalas, Per Carlson, H. Tschopp, M.B. Chertok, A. Liolios, D. Lecouturier, Ch. Rhême, D. Garreta, J.C. Michau, W. Fetscher, C. Witzig, J. R. Fry, M. Fidecaro, P. Fassnacht, A. Benelli, C.W.E. van Eijk, Christer Fuglesang, G. S. Varner, A. Go, E. Hubert, M. Dröge, K. Jon-And, S. Tatsis, Claudio Santoni, Marc Dejardin, B.L. Roberts, Lukas A. Schaller, A. Calzas, F. Blanc, U. Mall, D. King, R. Gamet, C. Touramanis, T. Geralis, D. Guyon, C. Kochowski, N. Karkour, D. Zimmerman, T. Klados, Frixos A Triantis, Danilo Zavrtanik, F. Henry-Couannier, C. Felder, D. Barraca, B. Pagels, A. Soares, D. Linget, João Carvalho, F. Montanet, L. Tauscher, P. Dechelette, P. Tsilimigras, B. Lofstedt, K. Kontek, Marcin Wladyslaw Wolter, P. Sanders, I. Papadopoulos, J. Derre, F. Pelucchi, P. Maley, O. Wigger, B. van Koningsveld, Jeffrey Boone Miller, A.J.P.L. Policarpo, D. Geiss, T. Lawry, H. Wendler, G. Chardin, Jean-Louis Faure, J. Kern, C. Thibault, C. Eleftheriadis, Stef. Charalambous, D. Warner, G. Polivka, Michael C. Carroll, R. Kreuger, A. Apostolakis, G. Marel, I. Tsamouranis, P. Charra, Sotirios Vlachos, A. Angelopoulos, J. Pinto da Cunha, A. Onofre, T. Schietinger, J. Bennet, Igor Mandić, A. Dijksman, J.P. Vanuxem, Y. Gally, R. Ferreira-Marques, E. van Beveren, F. Touchard, J. A. P. Da Silva, A. Cody, B. Dinkespiller, E. Cawley, E. Watson, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Lorgeril, Jocelyne

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, Detector, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Particle identification, law.invention, Nuclear physics, Time of flight, law, Antiproton, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Detectors and Experimental Techniques, 010306 general physics, Instrumentation
Abstract

The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using ${\rm K}^0$ and $\bar{\rm K}^0$ produced by the annihilation of $\bar{\rm p}$'s in a hydrogen gas target. The ${\rm K}^0$ and $\bar{\rm K}^0$ are identified by their companion products of the annihilation ${\rm K}^{\pm} \pi^{\mp}$ which are tracked with multiwire proportional chambers, drift chambers and streamer tubes. Particle identification is carried out with a liquid Cherenkov detector for fast separation of pions and kaons and with scintillators which allow the measurement of time of flight and energy loss. Photons are measured with a lead/gas sampling electromagnetic calorimeter. The required antiproton annihilation modes are selected by fast online processors using the tracking chamber and particle identification information. All the detectors are mounted in a 0.44 T uniform field of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable of full on-line reconstruction and selection of events. The design, operating parameters and performance of the sub-detectors are described.}

Published
1996
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3. Measurement of inclusive D±s photoproduction at HERA

Author

J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Stanek, R. Yoshida, M.C.K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, I. Brock, K. Coböken, J. Crittenden, R. Deffner, H. Hartmann, K. Heinloth, E. Hilger, P. Irrgang, H.-P. Jakob, A. Kappes, U.F. Katz, R. Kerger, E. Paul, H. Schnurbusch, A. Stifutkin, J. Tandler, K.Ch. Voss, A. Weber, H. Wieber, D.S. Bailey, O. Barret, N.H. Brook, B. Foster, G.P. Heath, H.F. Heath, J.D. McFall, D. Piccioni, E. Rodrigues, J. Scott, R.J. Tapper, M. Capua, A. Mastroberardino, M. Schioppa, G. Susinno, H.Y. Jeoung, J.Y. Kim, J.H. Lee, I.T. Lim, K.J. Ma, M.Y. Pac, A. Caldwell, W. Liu, X. Liu, B. Mellado, S. Paganis, S. Sampson, W.B. Schmidke, F. Sciulli, J. Chwastowski, A. Eskreys, J. Figiel, K. Klimek, K. Olkiewicz, K. Piotrzkowski, M.B. Przybycień, P. Stopa, L. Zawiejski, B. Bednarek, K. Jeleń, D. Kisielewska, A.M. Kowal, T. Kowalski, M. Przybycień, E. Rulikowska-Zarȩbska, L. Suszycki, D. Szuba, A. Kotański, L.A.T. Bauerdick, U. Behrens, J.K. Bienlein, C. Burgard, D. Dannheim, K. Desler, G. Drews, A. Fox-Murphy, U. Fricke, F. Goebel, P. Göttlicher, R. Graciani, T. Haas, W. Hain, G.F. Hartner, D. Hasell, K. Hebbel, K.F. Johnson, M. Kasemann, W. Koch, U. Kötz, H. Kowalski, L. Lindemann, B. Löhr, M. Martı́nez, M. Milite, T. Monteiro, M. Moritz, D. Notz, F. Pelucchi, M.C. Petrucci, M. Rohde, P.R.B. Saull, A.A. Savin, U. Schneekloth, F. Selonke, M. Sievers, S. Stonjek, E. Tassi, G. Wolf, U. Wollmer, C. Youngman, W. Zeuner, C. Coldewey, A. Lopez-Duran Viani, A. Meyer, S. Schlenstedt, P.B. Straub, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, L. Votano, A. Bamberger, A. Benen, S. Eisenhardt, P. Markun, H. Raach, S. Wölfle, P.J. Bussey, A.T. Doyle, S.W. Lee, N. Macdonald, G.J. McCance, D.H. Saxon, L.E. Sinclair, I.O. Skillicorn, R. Waugh, I. Bohnet, N. Gendner, U. Holm, A. Meyer-Larsen, H. Salehi, K. Wick, A. Garfagnini, I. Gialas, L.K. Gladilin, D. Kçira, R. Klanner, E. Lohrmann, G. Poelz, F. Zetsche, R. Goncalo, K.R. Long, D.B. Miller, A.D. Tapper, R. Walker, U. Mallik, P. Cloth, D. Filges, T. Ishii, M. Kuze, K. Nagano, K. Tokushuku, S. Yamada, Y. Yamazaki, S.H. Ahn, S.B. Lee, S.K. Park, H. Lim, I.H. Park, D. Son, F. Barreiro, G. Garcı́a, C. Glasman, O. Gonzalez, L. Labarga, J. del Peso, I. Redondo, J. Terrón, M. Barbi, F. Corriveau, D.S. Hanna, A. Ochs, S. Padhi, M. Riveline, D.G. Stairs, M. Wing, T. Tsurugai, V. Bashkirov, B.A. Dolgoshein, R.K. Dementiev, P.F. Ermolov, Yu.A. Golubkov, I.I. Katkov, L.A. Khein, N.A. Korotkova, I.A. Korzhavina, V.A. Kuzmin, O.Yu. Lukina, A.S. Proskuryakov, L.M. Shcheglova, A.N. Solomin, N.N. Vlasov, S.A. Zotkin, C. Bokel, M. Botje, N. Brümmer, J. Engelen, S. Grijpink, E. Koffeman, P. Kooijman, S. Schagen, A. van Sighem, H. Tiecke, N. Tuning, J.J. Velthuis, J. Vossebeld, L. Wiggers, E. de Wolf, D. Acosta, B. Bylsma, L.S. Durkin, J. Gilmore, C.M. Ginsburg, C.L. Kim, T.Y. Ling, S. Boogert, A.M. Cooper-Sarkar, R.C.E. Devenish, J. Große-Knetter, T. Matsushita, O. Ruske, M.R. Sutton, R. Walczak, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, U. Dosselli, S. Dusini, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, L. Adamczyk, L. Iannotti, B.Y. Oh, J.R. Okrasiński, W.S. Toothacker, J.J. Whitmore, Y. Iga, G. D'Agostini, G. Marini, A. Nigro, C. Cormack, J.C. Hart, N.A. McCubbin, T.P. Shah, D. Epperson, C. Heusch, H.F.-W. Sadrozinski, A. Seiden, R. Wichmann, D.C. Williams, N. Pavel, H. Abramowicz, S. Dagan, S. Kananov, A. Kreisel, A. Levy, T. Abe, T. Fusayasu, K. Umemori, T. Yamashita, R. Hamatsu, T. Hirose, M. Inuzuka, S. Kitamura, T. Nishimura, M. Arneodo, N. Cartiglia, R. Cirio, M. Costa, M.I. Ferrero, S. Maselli, V. Monaco, C. Peroni, M. Ruspa, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D.C. Bailey, C.-P. Fagerstroem, R. Galea, T. Koop, G.M. Levman, J.F. Martin, R.S. Orr, S. Polenz, A. Sabetfakhri, D. Simmons, J.M. Butterworth, C.D. Catterall, M.E. Hayes, E.A. Heaphy, T.W. Jones, J.B. Lane, B.J. West, J. Ciborowski, R. Ciesielski, G. Grzelak, R.J. Nowak, J.M. Pawlak, R. Pawlak, B. Smalska, T. Tymieniecka, A.K. Wróblewski, J.A. Zakrzewski, A.F. Żarnecki, M. Adamus, T. Gadaj, O. Deppe, Y. Eisenberg, D. Hochman, U. Karshon, W.F. Badgett, D. Chapin, R. Cross, C. Foudas, S. Mattingly, D.D. Reeder, W.H. Smith, A. Vaiciulis, T. Wildschek, M. Wodarczyk, A. Deshpande, S. Dhawan, V.W. Hughes, S. Bhadra, C. Catterall, J.E. Cole, W.R. Frisken, R. Hall-Wilton, M. Khakzad, S. Menary, and Zeus (IHEF, IoP, FNWI)

Subjects
Nuclear and High Energy Physics, Particle physics, E+E ANNIHILATION, LUND MONTE-CARLO, HERA, FOS: Physical sciences, PROTON, 01 natural sciences, JET FRAGMENTATION, High Energy Physics - Experiment, CROSS-SECTIONS, Nuclear physics, DEEP-INELASTIC SCATTERING, PHYSICS, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Nuclear Experiment, QC, Physics, Quantum chromodynamics, Research Groups and Centres\Physics\Low Temperature Physics, Annihilation, 010308 nuclear & particles physics, Branching fraction, Faculty of Science\Physics, ZEUS, Deep inelastic scattering, STRANGENESS SUPPRESSION, PARTON DISTRIBUTIONS, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics
Abstract

The first measurement of inclusive Ds+- photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies 130 < W < 280 GeV. The measured cross section for 3 < pt(Ds) < 12 GeV and |eta(Ds)|< 1.5 is sigma(ep -> Ds X) = 3.79 +- 0.59 (stat.) +0.26-0.46 (syst.) +- 0.94 (br.) nb, where the last error arises from the uncertainty in the Ds decay branching ratio. The measurements are compared with inclusive D*+- photoproduction cross sections in the same kinematic region and with QCD calculations. The Ds cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level O(alpha,alpha_s^3) calculation that was tuned to describe the ZEUS D* cross sections. The ratio of Ds+- to D*+- cross sections is 0.41 +- 0.07 (stat.) +0.03-0.05 (syst.) +- 0.10 (br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be gamma_s = 0.27 +- 0.05 +- 0.07 (br.). The cross-section ratio and gamma_s are in good agreement with those obtained in charm production in e+e- annihilation., 20 pages, 3 figures, submitted to Phys. Lett. B; 1 footnote added

Published
2000

4. ZEUS results on the measurement and phenomenology of F-2 at low x and low Q(2)

Author

T. Massam, C. Youngman, P. Göttlicher, B. Löhr, H. Schnurbusch, J. F. Martin, Y. Eisenberg, R. Walczak, K. Heinloth, A. Eskreys, D. Kçira, K. Desler, M. Milite, B. Foster, J. Y. Kim, Pietro Antonioli, Neville Harnew, Giuseppe Barbagli, H. Wieber, Ian Brock, D.C. Williams, DG Roff, Guenter Wolf, Y. Zamora Garcia, M.A.J. Botje, R. Wichmann, E. Strickland, A. Prinias, Andrea Contin, Elisabetta Gallo, W. Koch, Marcella Capua, G. Sartorelli, C. A. Heusch, N. Cartiglia, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, A. Nigro, Ricardo Graciani, H.-P. Jakob, R. L. Saunders, T. Fusayasu, K. Homma, Ada Solano, S. K. Park, J. Roldán, D. Sideris, M. Kuze, E. Lohrmann, F. Palmonari, L.K. Gladilin, G. Howell, C. L. Kim, H. Beier, Tadeusz Kowalski, G. Poelz, R. Brugnera, V. A. Kuzmin, D. C. Bailey, D. B. Miller, R. Yoshida, A. Bornheim, M. Inuzuka, Ulf Behrens, Federico Cindolo, S. Limentani, A. M. Czermak, Lothar At Bauerdick, Jens Hartmann, S. Wölfle, Amedeo Staiano, U. F. Katz, T. Yamashita, H. Kowalski, O. Ruske, M. Basile, F. Anselmo, H.E. Blaikley, J. T. Rahn, M. Pfeiffer, Dong-Chul Son, T. Wildschek, Gm Levman, P.F. Ermolov, Sergei Chekanov, Jan Figiel, S. Sampson, V. W. Hughes, T. Nishimura, U. Karshon, G. D'Agostini, WN Cottingham, V.A. Noyes, S. J. Hong, D. S. Waters, E. A. Heaphy, J. M. Pawlak, Marco Schioppa, N.C. Brummer, P. G. Pelfer, T. Ishii, I. T. Lim, A. D. Burow, J.T. Wu, D.D. Reeder, Detlef Filges, N. Pavel, Tobias M. Haas, Miriam Lucio Martinez, S. B. Lee, A. Seiden, M. Eckert, N.A. Korotkova, L. Bellagamba, M. Khakzad, J. K. Bienlein, Luis Hervas, D. Boscherini, Shoichi Yamada, R.C.E. Devenish, G. Susinno, J. M. Hernandez, G. Castellini, A. M. Cooper-Sarkar, S. Dagan, T. Y. Ling, L. Lindemann, Giovanni Abbiendi, Robert Klanner, A. Vaiciulis, Andreas Weber, M. B. Przybycień, P.M. Kooijman, Katsuya Yamauchi, Yu. A. Golubkov, S. Mattingly, S. A. Zotkin, A. Garfagnini, D. Westphal, Inkyu Park, Leszek Adamczyk, J.H. Vossebeld, Costas Foudas, M. Raso, G. Laurenti, A. T. Doyle, Wouter Verkerke, D. Mikunas, Stefan Stonjek, R. S. Orr, Richard Hall-Wilton, P. B. Straub, I. Suzuki, Kenneth Long, P. Cloth, Ta Romanowski, M. Wodarczyk, Francois Corriveau, Alexander Kappes, S. W. Lee, Florian Goebel, Joanne Cole, Juan Terron, B. A. Dolgoshein, A. Caldwell, E. Rulikowska-Zarȩbska, Silvia Maselli, R. Pawlak, Hao Zhang, Marta Ruspa, Mariusz Przybycien, M. Corradi, B. Smalska, S. Magill, S. Nam, A. Kotański, M.I. Ferrero, M. St-Laurent, G. Bari, H. F.W. Sadrozinski, F. J. Sciulli, Olga Lukina, Q. Zhu, D. Epperson, M. Posocco, L. Iannotti, Roberto Sacchi, L. M. Shcheglova, Jose Repond, C.H. Bokel, A. Pesci, J. D. McFall, T. Trefzger, J.R. Okrasiński, H.J. Grabosch, I. Gialas, K. Coböken, M. E. Hayes, R. Waugh, N. H. Brook, J. Scott, Rosario Nania, M. Grothe, Aharon Levy, C. Voci, Jonathan Butterworth, Matthias Kasemann, S. Bhadra, J.K. Edmonds, A.I. van Sighem, B. Surrow, G. Briskin, S. Polenz, James Crittenden, N. A. McCubbin, F. Zetsche, W. B. Schmidke, B. Mellado, D. Krakauer, W. H. Smith, L. Lamberti, L. Cifarelli, Giuseppe Iacobucci, Laurel E. Sinclair, G.J. McCance, H. Salehi, D. Notz, C. M. Ginsburg, U. Fricke, K. Klimek, Matthew Wing, K. Wick, L. Heinz, H.G.J.M. Tiecke, P. Giusti, Katsuo Tokushuku, S. Eisenhardt, Lucia Votano, C. Nath, P. Borzemski, T. W. Jones, G. L. Bashindzhagyan, R. Cross, J. Gilmore, Giuseppe Levi, G. Drews, W. N. Murray, J. Große-Knetter, J. A. Parsons, Mário Costa, W. Hain, R. J. Tapper, Umberto Dosselli, A.S. Proskuryakov, Janusz Chwastowski, A. Sabetfakhri, R. Kerger, K. Jelen, Claudia Glasman, J. P. Fernandez, Antonino Zichichi, S. K. Dhawan, E. A. De Wolf, J. R. Tickner, A. Ochs, I. Bohnet, R. Stanek, O. Schwarzer, Helen F Heath, Wr Frisken, I. A. Korzhavina, Roberto Carlin, M. Riveline, J.B. Lane, J. A. Zakrzewski, Tomohiro Abe, Luca Stanco, Lev Khein, Ben Bylsma, A. Bruni, J. Milewski, M. Bukowy, U. Wollmer, Yasunori Yamazaki, D. Simmons, N. Tuning, Jongmin Lee, J.J. Ryan, U. Schneekloth, I. O. Skillicorn, S. Kananov, J. K. Sedgbeer, H. Hartmann, John Hart, D. Chapin, D. Hasell, I. Butterworth, U. Holm, Ignacio Redondo, N. Macdonald, P. Nylander, Y. Iga, M. Y. Pac, G. Bruni, K. Hebbel, J.J. Engelen, P. Markun, Z. Jing, B. Bednarek, T. Koop, Enrico Tassi, J. J. Whitmore, A. Meyer-Larsen, G. F. Hartner, Cd Catterall, S. Ritz, D. S. Bailey, Halina Abramowicz, M. C. Petrucci, S. Kitamura, Abhay Deshpande, D. S. Hanna, L. Suszycki, Giovanni Maccarrone, D. Hochman, Anselmo Margotti, T. Tsurugai, T. Monteiro, S. Schlenstedt, P. J. Bussey, Vladimir Bashkirov, A. Bertolin, Rodney Walker, L.W. Wiggers, Z. Duliński, Krzysztof Piotrzkowski, G. Grzelak, W. Liu, T. C. Bacon, F. Selonke, S. De Pasquale, E. Hilger, R. Galea, J. F. de Trocóniz, F. Pelucchi, L. Zawiejski, B.Y. Oh, Roberto Cirio, C. Amelung, Cristiana Peroni, R. J. Cashmore, Luis Labarga, M. Rohde, M. Derrick, G. García, T. Tymieniecka, U. Kötz, P.R.B. Saull, B. Musgrave, N. Gendner, O. Deppe, J. Breitweg, E. Paul, R. J. Nowak, A. Stifutkin, A. F. Barnecki, M.C.K. Mattingly, L. S. Durkin, J. Ciborowski, R. Hamatsu, J. Puga, Els Koffeman, M. Dardo, K. Nagano, F. Dal Corso, R. Deffner, C. Coldewey, H. Raach, M. Adamus, G. Marini, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, W.F. Badgett, A. Polini, R. L. Talaga, Anna Mastroberardino, A. Quadt, Michele Arneodo, A. A. Savin, O. Barret, C.-P. Fagerstroem, A. N. Solomin, U. Mallik, Kurtis F Johnson, Greg P Heath, N. Coppola, M. Sievers, A. Meyer, K. Umemori, W. S. Toothacker, D Piccioni, J. Del Peso, Tachishige Hirose, Fernando Barreiro, Mauro Morandin, T. Matsushita, H. Lim, R. Stroili, G. Cara Romeo, J.T. Bromley, Antonio Pellegrino, D. Acosta, Dg Stairs, Vincenzo Monaco, J. Zajac, and Danuta Kisielewska

Subjects
Physics, Particle physics, QUANTUM CHROMODYNAMICS, Physics and Astronomy (miscellaneous), STRUCTURE-FUNCTION F-2(X, 010308 nuclear & particles physics, Q(2)), PROTON STRUCTURE FUNCTIONS, MUON SCATTERING, FOS: Physical sciences, ZEUS, 01 natural sciences, High Energy Physics - Experiment, CROSS-SECTIONS, Phenomenology (philosophy), High Energy Physics - Experiment (hep-ex), DEUTERON STRUCTURE FUNCTIONS, PARTON DISTRIBUTIONS, 0103 physical sciences, HIGH-ENERGY COLLISIONS, PERTURBATION-THEORY, 010306 general physics, Engineering (miscellaneous), Cursive
Abstract

Measurements of the proton structure function $F_2$ for $0.6 < Q^2 < 17 {GeV}^2$ and $1.2 \times 10^{-5} < x, 36 pages including 12 figures

Published
1999

5. Observation of isolated high-E-T photons in photoproduction at HERA

Author

M. Zachara, R.C.E. Devenish, Q. Zhu, H.-P. Jakob, R. L. Saunders, Danuta Kisielewska, T. Massam, G. Laurenti, B. Mellado, K. Umemori, R. Brugnera, V. A. Kuzmin, D. C. Bailey, M. Kuze, N. Pavel, P.M. Kooijman, M. St-Laurent, D.C. Williams, C. Youngman, A. H. Walenta, Ta Romanowski, F. Dal Corso, M.E. Hayes, L. Iannotti, Antonino Zichichi, R. Loveless, C. Coldewey, J. Shulman, T. Fusayasu, Juan Terron, M. Kasprzak, C.R. Sampson, Jeffrey T. Rahn, Marcel Vreeswijk, R. Ullmann, V.A. Noyes, O. Schwarzer, Helen F Heath, D.D. Reeder, J. Del Peso, C. Rembser, N. A. McCubbin, P. Giusti, Gm Levman, Marco Schioppa, S. Magill, N.C. Brummer, P. G. Pelfer, S.H. An, G. Drews, W.F. Badgett, A.S. Proskuryakov, J. Hartmann, C. Voci, M. Wodarczyk, D. S. Waters, K. Homma, Cristiana Peroni, R. J. Cashmore, K. Yamauchi, M. Y. Pac, W. Hain, C. M. Ginsburg, A. Meyer-Larsen, U. Wollmer, J.J. Ryan, Richard Hall-Wilton, M. Derrick, T. Tymieniecka, S. Ritz, M. Roco, M.A.J. Botje, N. Cartiglia, J. Stamm, B. Foster, U. Kötz, Jonathan Butterworth, S. Yamada, M. C. Petrucci, A. Pesci, H. Kowalski, U. Fricke, S. Mattingly, A. Caldwell, A. Bertolin, Silvia Maselli, N. Gendner, D. Simmons, M. L. Utley, H. Zhang, J. F. Martin, A. Nigro, Fernando Barreiro, Mauro Morandin, Z. Jakubowski, R. S. Orr, F. Palmonari, S. Wölfle, Amedeo Staiano, U. F. Katz, O. Ruske, M. Pfeiffer, M. Brkic, Yuji Yamazaki, D. Horstmann, N. H. Brook, V. L. Harris, Rosario Nania, Sung Keun Park, John Hart, T. Tsurugai, J.T. Bromley, J. Breitweg, F. Ricci, R. J. Nowak, H. F.W. Sadrozinski, Giuseppe Levi, H. Park, Kenneth Long, J. Y. Kim, G. Bari, D. Filges, C. L. Kim, A.F. Whitfield, D. Hasell, G. D'Agostini, R. Kerger, K. Jelen, Matthias Kasemann, A. Prinias, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, Elisabetta Gallo, A. Bruni, L.K. Gladilin, S. W. Nam, W.R. Frisken, R. Pawlak, F. Selonke, Pietro Antonioli, Luisa Cifarelli, Neville Harnew, E. Hilger, J. Repond, P.B. Straub, D. Piccioni, W. Koch, D.S. Hanna, J.J. Engelen, T. Y. Ling, P. B. Kaziewicz, L. Lamberti, T. Yamashita, M. Löwe, Thomas Trefzger, F. Pelucchi, B. Bednarek, L. Lindemann, K.F. Johnson, S. Sampson, J. A. Zakrzewski, Y. Zamora Garcia, H. Beier, Tadeusz Kowalski, M. Nakao, Robert Klanner, A. Vaiciulis, D.G. Roff, H. Salehi, D. Notz, M. Rohde, D. Sideris, T. W. Jones, D. Revel, Michele Arneodo, Ulf Behrens, Federico Cindolo, B.Y. Oh, H. Uijterwaal, U. Schneekloth, D. Acosta, T. Voß, I. Butterworth, I. Suzuki, G. Poelz, F. Zetsche, K. Coböken, D. B. Miller, L.W. Hung, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, M. Lancaster, Anselmo Margotti, Enrico Tassi, J. J. Whitmore, R. Waugh, R. Cross, L.W. Wiggers, C. Amelung, Miriam Lucio Martinez, J. Gilmore, S. B. Lee, Y. Iga, A. M. Cooper-Sarkar, S. Dagan, J. Bulmahn, C. A. Heusch, J.T. Wu, A. Ochs, Mariusz Przybycien, M. Corradi, Vincenzo Monaco, L. Suszycki, M. Khakzad, James Crittenden, Andrea Contin, Katsuo Tokushuku, S. Polenz, G. Cases, M. Basile, A. Pellegrino, T. Haas, Giancarlo Susinno, Yu. A. Golubkov, F. Anselmo, M. Inuzuka, C.H. Bokel, Lucia Votano, C. Nath, C.-P. Fagerstroem, R. Yoshida, B.D. Burow, Costas Foudas, L.W. Mo, B. Surrow, Umberto Dosselli, Jongmin Lee, M.C.K. Mattingly, E. Lohrmann, L. S. Durkin, I. Gialas, B. H. Y. Hung, H.J. Grabosch, Luca Stanco, Lev Khein, A. N. Solomin, T. Ishii, B. Musgrave, U. Mallik, J.I. Fleck, J. Zaja̧c, J. M. Pawlak, R. Hamatsu, Janusz Chwastowski, J. Puga, D.G. Stairs, J.D. McFall, T. Monteiro, M. Posocco, O. Deppe, H.E. Blaikley, Y. Eisenberg, L. M. Shcheglova, D.J. Gilkinson, Guillaume Garcia, R. Walczak, S. Kananov, J. P. Fernandez, J. K. Sedgbeer, E. Paul, A. Garfagnini, P.F. Ermolov, K. Nagano, R. Deffner, G. Bruni, K. Muchorowski, E. A. De Wolf, M. Grothe, J. R. Tickner, K. Heinloth, L. Heinz, J. M. Hernandez, J. K. Bienlein, Giuseppe Barbagli, H. Wieber, J. Roldán, M. Adamus, G. Briskin, Leszek Adamczyk, I. A. Korzhavina, G. Marini, R. Wedemeyer, W.N. Cottingham, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, A. Stifutkin, G.P. Heath, Marcella Capua, Giuseppe Iacobucci, D. Westphal, J. Labs, B. Lu, G. Sartorelli, R. Stanek, S.A. Zotkin, N. Tuning, I.H. Park, M.I. Ferrero, M. Przybycien, J. Große-Knetter, U. Karshon, A.A. Savin, D.S. Bailey, D. Mikunas, P. Nylander, K. K. Joo, Luis Hervas, R. G. Feild, J. Ciborowski, D. Boscherini, A.F. Żarnecki, K. Desler, D. Krakauer, I. Bohnet, Tomohiro Abe, G. Castellini, W.N. Murray, Z. Jing, J.S.T. Ng, Vladimir Bashkirov, A. Quadt, P. Cloth, O. Mańczak, P. Markun, D. Kçira, G. F. Hartner, Ben Bylsma, J. Milewski, M. Bukowy, F. Corriveau, G. Grzelak, M. Eckert, N.A. Korotkova, L. Bellagamba, H. Hartmann, T. C. Bacon, M. Dardo, P. Borzemski, W. Liu, S. De Pasquale, A.S. Wilson, Sridhara Dasu, Ian Brock, R. Ayad, O. Yu. Lukina, S Campbell-Robson, Halina Abramowicz, W. Schott, Cd Catterall, A. Polini, Z. Duliński, R.L. Talaga, J.A. Parsons, D. Epperson, J.K. Edmonds, A.I. van Sighem, K. Wick, G. Abbiendi, G. Cara Romeo, M. Riveline, S. Eisenhardt, F. Sciulli, J.N. Lim, G. Howell, R.J. Tapper, A. Meyer, H.G.J.M. Tiecke, E. Strickland, Giovanni Maccarrone, D. Hochman, S. Schlenstedt, P. J. Bussey, E. Rulikowska-Zarȩbska, Joanne Cole, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, C. Glasman, A. Bornheim, Tachishige Hirose, P. Göttlicher, Roberto Carlin, D. Chapin, J.B. Lane, Gy. Wolf, Roberto Sacchi, T. Matsushita, R. Stroili, Aharon Levy, Laurel E. Sinclair, A. Seiden, J.H. Vossebeld, M. Raso, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, B. A. Dolgoshein, Ada Solano, S. Limentani, I. T. Lim, S. Bhadra, B. Löhr, S. Kitamura, A. Kotański, L.A.T. Bauerdick, J.R. Okrasiński, U. Holm, Krzysztof Piotrzkowski, K. Ohrenberg, W. H. Smith, R. Graciami, Mário Costa, F.S. Chlebana, and Zeus (IHEF, IoP, FNWI)

Subjects
COLLISIONS, Nuclear and High Energy Physics, Particle physics, Photon, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Photon energy, 01 natural sciences, 7. Clean energy, CROSS-SECTIONS, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), GLOBAL QCD, 0103 physical sciences, CALORIMETER, 010306 general physics, Nuclear Experiment, COMPTON-SCATTERING, Quantum chromodynamics, Physics, Jet (fluid), ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, Compton scattering, ZEUS, HERA, CENTRAL TRACKING DETECTOR, PARTON DISTRIBUTIONS, Pseudorapidity, High Energy Physics::Experiment, HARD SCATTERING
Abstract

Events containing an isolated prompt photon with high transverse energy, together with a balancing jet, have been observed for the first time in photoproduction at HERA.The data were taken with the ZEUS detector, in a $\gamma p$ centre of mass energy range 120--250 GeV. The fraction of the incoming photon energy participating in the production of the prompt photon and the jet, $x_\gamma$, shows a strong peak near unity, consistent with LO QCD Monte Carlo predictions. In the transverse energy and pseudorapidity range $5\le \eTg < 10$ GeV, $-0.7 \le \eta^\gamma < 0.8$, $\eTj\ge 5$ GeV, and $-1.5\le \eta^{jet}\le 1.8$, with $\xgO > 0.8,$ the measured cross section is $15.3 \pm 3.8 \pm 1.8 pb$, in good agreement with a recent NLO calculation., Comment: 22 pages including 8 figures

Published
1997

6. Recent results on CP violation from the CPLEAR experiment

Author

E. Rozaki, E. Aslanides, L. Faravel, Marc Dejardin, P. Weber, Christer Fuglesang, J. Derre, Nikolaos Manthos, P Harrison, R. Le Gac, E. Machado, Ch Yèche, B. Eckart, J. Pinto da Cunha, M. Chardalas, A. Liolios, H. Postma, T. Nakada, J. Duclos, D. Zimmerman, L. Sacks, C. Bula, G. Burgun, T. Ruf, R. Ferreira-Marques, J. Bennet, E. Gabathuler, P. Maley, C. Guyot, A. Apostolakis, V. Bertin, P.-R. Kettle, G. Backenstoss, F. Pelucchi, K. Jansson, F. Montanet, H.U. Johner, P. Fassnacht, A. Schopper, P. Gumplinger, Andras Kerek, S. Szilagyi, T. Lawry, A. Onofre, P.J. Hayman, Ludwig Tauscher, C. Felder, D.A. Troester, Mats Danielsson, R. Adler, C. Witzig, W. Fetscher, J.C. Dousse, T. Alhalel, O. Wigger, Ioannis Evangelou, C.W.E. van Eijk, M. W. Wolter, Theodoros Geralis, L. Sakeliou, A. Go, H.-J. Gerber, J. K. Bienlein, F. Touchard, Per Carlson, C. Touramanis, E. Cawley, C. Kochowski, Philippe Bloch, Frixos A Triantis, W.G. Heyes, A. Ealet, B. Pagels, J. Kern, R.W. Hollander, S. Dedoussis, David Francis, Ph. Schune, K. Jon-And, M. Mikuz, I. Mandić, Jeffrey Boone Miller, Sotirios Vlachos, M. Schafer, R. Gamet, A. Angelopoulos, L.A. Schaller, R. Kreuger, Claudio Santoni, G. Marel, A. Filipčič, João Carvalho, Danilo Zavrtanik, P. Sanders, S. Charalambous, A.J.P.L. Policarpo, G. Varner, M. Dodgson, C. Thibault, C. Eleftheriadis, Jean-Louis Faure, D. Garreta, G. Polivka, R.L. Roberts, K. Sarigiannis, J. R. Fry, P. Pavlopoulos, M. Van den Putte, Christopher Bee, R. Rickenbach, M. Fidecaro, Panagiotis Kokkas, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Morales A., CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Meson, 010308 nuclear & particles physics, Strangeness, 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Particle decay, Pair production, Pion, Antimatter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, High Energy Physics::Experiment, 010306 general physics
Abstract

The CPLEAR experiment is aiming at precise CP violation tests using initially pure K0- and K0BAR beams from the intense source provided by the annihilation of the LEAR pBAR-beam in hydrogen. The strangeness tagging efficiency and the systematic errors have been studied and found to be in agreement with the design specifications. The measurement of the differential time asymmetry of the pi+pi- decays allowed the direct observation of differences in the decay rates of particles and antiparticles.The CP violating parameters were determined as \eta+/-\ = (2.32 +/- 0.14) . 10(-3) and phi+/- = 42.3-degrees +/- 4.4-degrees. First results in the reconstruction and analysis of the neutral kaon decays into two neutral pions and the K(e)3 decay are presented. Nuclear Physics B

Published
1992

7. Status of the CP LEAR experiment and first results

Author

P. Bloch, J. Duclos, P. Gumpliger, J. R. Fry, G. S. Varner, E. Kossionides, K. Jansson, G. Burgun, P. Weber, P. Pavlopoulos, L. Sakeliou, B. Eckart, H. Cobbaert, Lukas A. Schaller, Sp. Dedoussis, Marko Mikuz, A. Onofre, D.A. Troester, Kerstin Jon-And, E. Gabathuler, R. Rickenbach, L. Faravel, Nikolaos Manthos, Claudio Santoni, U. Seljak, R. Gamet, R. Ferreira-Marques, A. Go, P. Sanders, Jean-Louis Faure, C. Witzig, J. Pinto da Cunha, P. Carlson, Theodoros Geralis, G. Marel, Ch. Bula, D. Garreta, C. W. W. Van Eijk, S. Szilagyi, J. Kern, G. Backenstoss, D. Zimmerman, C. Fuglesang, M. Fidecaro, P.R. Kettle, L. Tauscher, A. Schopper, David Francis, F. Montanet, C. Thibault, C. B. Bee, B. L. Roberts, P.J. Hayman, A. Apostolakis, João Carvalho, H. J. Johner, Andras Kerek, R.W. Hollander, L. Sacks, C. Touramanis, W. Fetscher, T. Paradelis, Eef van Beveren, K. Sarigianis, T. Nakada, R. Le Gac, Francois Touchard, J. Derre, Frixos A Triantis, Stef. Charalambous, R. Adler, Panagiotis Kokkas, Sotirios Vlachos, T. Lawry, J.C. Dousse, H.-J. Gerber, W.G. Heyes, A. Angelopoulos, M. Chardalas, Danilo Zavrtanik, T. Ruf, J. Bennet, Patrick Fassnacht, Elie Aslanides, P. F. Harrison, M. Dodgson, E. Machado, C. Kochowski, Andrej Filipcic, B. Pagels, Claude Guyot, C. Felder, M. Van de Putte, H. Postma, F. Pelucchi, P. Maley, J. S. Miller, Marc Dejardin, E. Rozaki, A.J.P.L. Policarpo, P. Marotte, R. Kreuger, A. Ealet, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Damoiseaux, Magali, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Large Hadron Collider, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 01 natural sciences, Atomic and Molecular Physics, and Optics, 3. Good health, Nuclear physics, Moment (mathematics), Pair production, Antiproton, Antimatter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics
Abstract

The aim of the CP LEAR experiment is to study symmetry-violation effects, making use of tagged K0's and K0's. The detector, although missing some electronic components, has been operational for a few weeks at the end of 1989 at the CERN Low-Energy Antiproton Ring (LEAR). At the moment, the analysis of the data is in progress. This paper gives a description of the experimental method and of the detector; the sensitivities of some measurements and some preliminary results are also discussed.

Published
1990

8. Recent results of the CPLEAR experiment

Author

H. Postma, J.C. Dousse, T. Alhalel, H.-J. Gerber, W.G. Heyes, J. Duclos, B. Eckart, T. Ruf, K. Jansson, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, T. Lawry, B.L. Roberts, Kerstin Jon-And, Nikolaos Manthos, A. Liolios, Jeffrey Boone Miller, P. Weber, R. Ferreira-Marques, S. Szilagyi, L. Sakeliou, P.F. Harrison, M. Chardalas, P. Gumplinger, Lukas A. Schaller, G. Chardin, Jean-Louis Faure, A. Go, J. Pinto da Cunha, Andras Kerek, P. Sanders, M. Van den Putte, D. Garreta, J. Kern, P. Bloch, Marko Mikuz, Ch. Bula, G. Backenstoss, Christopher Bee, P. Fassnacht, M. Dejardin, A. Apostolakis, A. Soares, W. Fetscher, P.J. Hayman, M. Fidecaro, A.J.P.L. Policarpo, David Francis, C.W.E. van Eijk, D. Zimmerman, P. Carlson, O. Wigger, Theodoros Geralis, A. Onofre, E. Gabathuler, E. Rozaki, R. Rickenbach, R. Kreuger, Christer Fuglesang, C. Touramanis, R. Gamet, R. Le Gac, Frixos A Triantis, V. Bertin, D.A. Troster, C. Witzig, J. R. Fry, R.W. Hollander, Panagiotis Kokkas, T. Nakada, G. S. Varner, J.K. Bielein, K. Sarigiannis, G. Marel, E. Cawley, J. Bennet, Elie Aslanides, Igor Mandić, Mats Danielsson, R. Adler, C. Thibault, P. Pavlopoulos, A. Angelopoulos, A. Schopper, C. Kochowski, C. Eleftheriadis, B. Pagels, S. Vlachos, Francois Touchard, E. van Beveren, Stef. Charalambous, Ph. Schune, A. Ealet, G. Polivka, L. Faravel, L. Sacks, M. Schafer, Claudio Santoni, Andrej Filipcic, João Carvalho, F. Montanet, I. Evangelou, H.U. Johner, Claude Guyot, P. Maley, P.R. Kettle, L. Tauscher, Danilo Zavrtanik, E. Machado, Sp. Dedoussis, M. Dodgson, C. Felder, C. Yeche, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, 0103 physical sciences, Measure (physics), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, 01 natural sciences
Abstract

The CPLEAR experiment at CERN has been designed to measure CP and T violating effects in the neutral kaon system by observing particle-antiparticle asymmetries. The motivation and the physics program of CPLEAR is presented and first analyses of the K0,K0BAR to pi+pi-, pi0pi0 and pi+pi-pi0 decays are discussed. Special emphasis is given to the recent results of the measurement of the CP violating parameters phi+- and eta+- based on first data taken in 1990/1991. Nuclear Physics A

9. D* production in deep inelastic scattering at HERA

Author

J.N. Lim, G. Howell, D. Sideris, L.K. Gladilin, G. Castellini, P. Borzemski, Rosario Nania, Sung Keun Park, F. Dal Corso, A.S. Wilson, W. Verkerke, L. Cifarelli, E. Rulikowska-Zarȩbska, D. B. Miller, H.-P. Jakob, R. L. Saunders, Tachishige Hirose, C. Glasman, M. Kuze, L. Lamberti, M. Basile, W.F. Badgett, A. Pellegrino, T. Haas, F. Anselmo, T. Dubbs, C. Rembser, Katsuo Tokushuku, Umberto Dosselli, K. Ohrenberg, T. Yamashita, H. Zhang, S. Dagan, R. Brugnera, V. A. Kuzmin, M. Khakzad, D. C. Bailey, M. Nakao, C. Youngman, Janusz Chwastowski, M. Inuzuka, N. A. McCubbin, J. F. Martin, A. Nigro, W. H. Smith, Yu. A. Golubkov, A. Bornheim, T. Matsushita, P. Giusti, Roberto Sacchi, S. Yamada, G.P. Heath, Gm Levman, D. S. Waters, R. Stroili, E. A. De Wolf, G. Drews, W. Hain, Y. Zamora Garcia, J. Bulmahn, T. Voß, M. Posocco, C. L. Kim, D.S. Bailey, B. Löhr, A.S. Proskuryakov, K. Yamauchi, H. Kowalski, J. R. Tickner, M. Lancaster, J.T. Wu, Danuta Kisielewska, T. Massam, A. Ochs, Aharon Levy, F.S. Chlebana, Peter Bussey, A.F. Whitfield, S. Mattingly, P. Cloth, M. Eckert, N.A. Korotkova, L. Bellagamba, S. Nam, Cristiana Peroni, R. J. Cashmore, A. Zichichi, Matthias Kasemann, R. Yoshida, R. Ayad, N. Pavel, B.D. Burow, D.G. Roff, R. Pawlak, J.I. Fleck, Michele Arneodo, P. Nylander, K. K. Joo, J.A. Parsons, H. Salehi, W.N. Cottingham, J. Zaja̧c, J. Hartmann, D. Notz, J. Shulman, Laurel E. Sinclair, B. Lu, G. Cara Romeo, O. Mańczak, P. Markun, M. Derrick, C. Voci, G. F. Hartner, Juan Terron, M. Kasprzak, I. Suzuki, R. Waugh, M. St-Laurent, William S. Lockman, U. Holm, R. Stanek, G. Briskin, P.M. Kooijman, T. W. Jones, J. M. Pawlak, C. M. Ginsburg, L. Suszycki, S. Kitamura, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, D.C. Williams, C. Coldewey, A. H. Walenta, T. Tymieniecka, U. Kötz, S. Ritz, A. Garfagnini, A. Caldwell, R. Cross, Z. Duliński, I.H. Park, N. Cartiglia, Giuseppe Levi, J. Gilmore, K. Muchorowski, N. Gendner, D. Kçira, Ian Brock, J.D. McFall, K. Jelen, Ricardo Graciani, J.K. Edmonds, A.I. van Sighem, J.T. Bromley, Krzysztof Piotrzkowski, F. Palmonari, Joanne Cole, P.F. Ermolov, W.R. Frisken, Richard Hall-Wilton, K. Wick, Marco Schioppa, S. Magill, N.C. Brummer, P. G. Pelfer, J. Breitweg, R. Wedemeyer, G. Cases, G. Abbiendi, S. Wölfle, Costas Foudas, L.W. Mo, Amedeo Staiano, Yuji Yamazaki, E. Strickland, Silvia Maselli, R. Loveless, M. Pfeiffer, Amanda Cooper-Sarkar, D. Acosta, M. Riveline, T. Fusayasu, D. Filges, R. J. Nowak, Luca Stanco, Lev Khein, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, S. Sampson, R. S. Orr, J. Stamm, Vincenzo Monaco, B. Foster, F. Sciulli, A. Quadt, S.A. Zotkin, U. Schneekloth, P. Göttlicher, M.C.K. Mattingly, L. Lindemann, J. A. Zakrzewski, S. Kananov, J. K. Sedgbeer, C.R. Sampson, A. Kotański, G. Bruni, D. Horstmann, N. H. Brook, V. L. Harris, Kenneth Long, J. Labs, I. Butterworth, L. S. Durkin, L.A.T. Bauerdick, Y. Iga, R. Hamatsu, A. Pesci, Roberto Carlin, M. Rohde, J. Y. Kim, R.J. Tapper, Jeffrey T. Rahn, J.R. Okrasiński, Pietro Antonioli, Neville Harnew, G. Bari, J. Repond, O. Ruske, Ben Bylsma, J. Milewski, J. Puga, D.S. Hanna, M. Van Hook, B. Bednarek, H. Hartmann, D. Chapin, Thomas Trefzger, K.F. Johnson, A. Seiden, T. Doeker, Jose M Hernandez, K. Nagano, M. Roco, Giovanni Maccarrone, D. Hochman, R. Deffner, W. Liu, S. Schlenstedt, M. Brkic, M. Adamus, Sridhara Dasu, F. Zetsche, J.H. Vossebeld, M. Raso, A. Eskreys, A. T. Doyle, Ta Romanowski, R. Ullmann, V.A. Noyes, G. Marini, Ada Solano, J. Ciborowski, A. Kruse, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, S Campbell-Robson, Halina Abramowicz, L. Labarga, T. Monteiro, K. Coböken, F. Selonke, B. Surrow, Marcella Capua, S. Limentani, D. Hasell, O. Yu. Lukina, E. Hilger, G. D'Agostini, B. A. Dolgoshein, Jongmin Lee, F. Pelucchi, M. Dardo, I. T. Lim, James Crittenden, S. Bhadra, Jonathan Butterworth, T. Y. Ling, B.Y. Oh, Roman Walczak, A. Polini, U. Fricke, M. Grothe, C. A. Heusch, C. Amelung, S. De Pasquale, L. Heinz, E. Lohrmann, H.E. Blaikley, W. Schott, Cd Catterall, A. Meyer-Larsen, A. Bertolin, J.J. Engelen, Robert Klanner, A. Vaiciulis, Leszek Adamczyk, Anselmo Margotti, L.W. Wiggers, S. Polenz, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, Y. Eisenberg, D.J. Gilkinson, Guillaume Garcia, D.D. Reeder, J. P. Fernandez, M. Wodarczyk, I. A. Korzhavina, D. Westphal, H. Park, U. Karshon, K. Heinloth, Giuseppe Barbagli, Luis Hervas, J. Roldán, D. Boscherini, P. B. Kaziewicz, W.N. Murray, J.S.T. Ng, H. Uijterwaal, H.G.J.M. Tiecke, G. Sartorelli, M. Przybycien, J.B. Lane, Gy. Wolf, A.A. Savin, A. Contin, L.W. Hung, Lucia Votano, C. Nath, M. Zachara, R.C.E. Devenish, Q. Zhu, G. Laurenti, L. Iannotti, A. Prinias, Elisabetta Gallo, W. Koch, H. Beier, Tadeusz Kowalski, G. Poelz, Lutz Feld, S.H. An, M. Y. Pac, M. C. Petrucci, T. Tsurugai, P.B. Straub, L. M. Shcheglova, Giuseppe Iacobucci, M.A.J. Botje, I. Bohnet, Tomohiro Abe, Z. Jing, Ulf Behrens, Federico Cindolo, Miriam Lucio Martinez, S. B. Lee, T. Ishii, B. Musgrave, D.G. Stairs, K. Desler, Hartmut Sadrozinski, R.L. Talaga, S. Eisenhardt, J.J. Ryan, B. H. Y. Hung, J. K. Bienlein, Mariusz Przybycien, M. Corradi, C.H. Bokel, H.J. Grabosch, O. Deppe, M.E. Hayes, O. Schwarzer, Helen F Heath, U. Wollmer, I. Gialas, Marco Costa, D. Simmons, John Hart, M.I. Ferrero, D. Mikunas, R. G. Feild, D. Krakauer, A. Meyer, K. Umemori, A. Bruni, M. Löwe, Marcel Vreeswijk, Enrico Tassi, J. J. Whitmore, Giancarlo Susinno, Vladimir Bashkirov, F. Corriveau, G. Grzelak, T. C. Bacon, J. Del Peso, K. Homma, E. Barberis, C.-P. Fagerstroem, A. N. Solomin, U. Mallik, A.V. Shumilin, J. Große-Knetter, Fernando Barreiro, Martin Utley, Mauro Morandin, Z. Jakubowski, U. F. Katz, D. Piccioni, A.F. Ż.arnecki, D. Revel, E. Paul, A. Stifutkin, and Zeus (IHEF, IoP, FNWI)

Subjects
COLLISIONS, Nuclear and High Energy Physics, Particle physics, Proton, FOS: Physical sciences, PROTON, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, ZEUS CALORIMETER, High Energy Physics - Experiment (hep-ex), Positron, 0103 physical sciences, Charm (quantum number), QCD ANALYSIS, 010306 general physics, Nuclear Experiment, Physics, Quantum chromodynamics, ZEUS (particle detector), CONSTRUCTION, 010308 nuclear & particles physics, ZEUS, CENTRAL TRACKING DETECTOR, PARTON DISTRIBUTIONS, INTRINSIC CHARM, EP SCATTERING, ELECTROPRODUCTION, Structure function, HERA, Deep inelastic scattering, High Energy Physics::Experiment
Abstract

This paper presents measurements of D^{*\pm} production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The data have been taken with the ZEUS detector at HERA. The decay channel $D^{*+}\to (D^0 \to K^- \pi^+) \pi^+ $ (+ c.c.) has been used in the study. The $e^+p$ cross section for inclusive D^{*\pm} production with $5, Comment: 17 pages including 4 figures

10. Measurement of elastic Υ photoproduction at HERA

Author

A. Bruni, F. Selonke, E. Hilger, R. Galea, L. M. Shcheglova, Enrico Tassi, J. J. Whitmore, F. Pelucchi, Michele Arneodo, Giancarlo Susinno, Giuseppe Iacobucci, A. Meyer, K. Umemori, G.J. McCance, P. Borzemski, H. Schnurbusch, B.Y. Oh, R.L. Talaga, S. W. Lee, Rosario Nania, Sung Keun Park, J.T. Wu, R. Loveless, Mariusz Przybycien, M. Corradi, W. S. Toothacker, C.H. Bokel, T. Fusayasu, A. Ochs, H.J. Grabosch, H. Zhang, J. F. Martin, C. Amelung, L. Suszycki, H.-P. Jakob, L. Lamberti, I. Bohnet, Jeffrey T. Rahn, Tomohiro Abe, A. Kotański, Antonino Zichichi, D. Epperson, J.I. Fleck, R. Graciani, L.A.T. Bauerdick, J. Zaja̧c, R. L. Saunders, V.A. Noyes, J. Del Peso, U. Wollmer, Z. Jing, J.R. Okrasiński, I. Gialas, C. A. Heusch, K. Coböken, Y. Zamora Garcia, Katsuo Tokushuku, B. Mellado, D. Simmons, Inkyu Park, Leszek Adamczyk, S. J. Hong, John Hart, N. Pavel, J.J. Ryan, Umberto Dosselli, R. Brugnera, Thomas Trefzger, K.F. Johnson, P. Cloth, S. Eisenhardt, Janusz Chwastowski, J.K. Edmonds, A.I. van Sighem, M. Y. Pac, K. Homma, E. Lohrmann, E. A. De Wolf, J. R. Tickner, Danuta Kisielewska, J. Ciborowski, M.I. Ferrero, Ada Solano, D. Mikunas, M.C.K. Mattingly, L. S. Durkin, R. Hamatsu, J. Puga, Els Koffeman, Lucia Votano, C. Nath, Yuji Yamazaki, V. A. Kuzmin, D. Krakauer, K. Nagano, W. H. Smith, G. Briskin, P.M. Kooijman, T. Massam, M.A.J. Botje, N. Cartiglia, W.N. Cottingham, Mário Costa, James Crittenden, H.G.J.M. Tiecke, S. Limentani, D. C. Bailey, C. Youngman, Dong-Chul Son, K. Wick, G. Abbiendi, R. Stanek, R. Deffner, Juan Terron, Vladimir Bashkirov, G.F. Hartner, M. Riveline, Anna Mastroberardino, I. O. Skillicorn, Fernando Barreiro, Andrea Contin, H.E. Blaikley, L.K. Gladilin, Mauro Morandin, M. Adamus, N. Tuning, M. C. Petrucci, F. Corriveau, R. Yoshida, I. T. Lim, M. Grothe, F. Sciulli, H.F. Heath, L. Heinz, M. Dardo, T. Tsurugai, B.D. Burow, G. Grzelak, G. Marini, S. Bhadra, T. Monteiro, J.A. Parsons, G. Cara Romeo, L. Lindemann, J. A. Zakrzewski, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, A. Quadt, M. E. Hayes, H. Lim, Y. Eisenberg, A. Sabetfakhri, C. Coldewey, Guillaume Garcia, H. Raach, Gm Levman, R. S. Orr, P.B. Straub, N. A. McCubbin, T. C. Bacon, D. S. Waters, U. Holm, R. Walczak, F. Palmonari, K. Heinloth, J. M. Pawlak, Jan Figiel, Marcella Capua, Kenneth Long, G. Bari, J. Repond, K. Desler, A. Polini, S. De Pasquale, S. Wölfle, R.J. Tapper, M. Milite, Giuseppe Barbagli, H. Wieber, J. Roldán, D.S. Hanna, T. Yamashita, M. St-Laurent, F. Dal Corso, H. Kowalski, Cristiana Peroni, R. J. Cashmore, B. Bednarek, Amedeo Staiano, U. F. Katz, A. Garfagnini, R. Wichmann, Abhay Deshpande, A. M. Cooper-Sarkar, S. Dagan, S. Mattingly, D. Piccioni, Matthias Kasemann, D.C. Williams, M. Khakzad, K. Klimek, K. Yamauchi, D.G. Roff, J. K. Bienlein, M. Pfeiffer, Ulf Behrens, Federico Cindolo, M. Derrick, T. Tymieniecka, F. Zetsche, Krzysztof Piotrzkowski, A.S. Proskuryakov, Yu. A. Golubkov, Giovanni Maccarrone, D. Hochman, Ta Romanowski, M. Wing, S. K. Dhawan, D. Filges, S. Schlenstedt, P. J. Bussey, R. Pawlak, W.F. Badgett, U. Kötz, P.R.B. Saull, J.B. Lane, Gy. Wolf, H. Salehi, G. Sartorelli, M. Przybycien, J.T. Bromley, D. Notz, G. Howell, M. Posocco, Joanne Cole, S. B. Lee, N. Gendner, C.-P. Fagerstroem, O. Deppe, J. Breitweg, Marco Schioppa, S. Magill, N.C. Brummer, Richard Hall-Wilton, B. Löhr, S. Stonjek, A.A. Savin, P. G. Pelfer, A. N. Solomin, U. Mallik, Jonathan Butterworth, R. Waugh, Aleksander Filip Żarnecki, Silvia Maselli, M. Inuzuka, S. Yamada, E. Rulikowska-Zarȩbska, S. Kitamura, R. J. Nowak, D. Acosta, T. Ishii, P. Nylander, K. K. Joo, U. Fricke, B. Musgrave, D.S. Bailey, B. Smalska, D.G. Stairs, D.D. Reeder, Roberto Carlin, P. Markun, D. Chapin, Vincenzo Monaco, Giuseppe Levi, N. H. Brook, M. Eckert, N.A. Korotkova, L. Bellagamba, M. Wodarczyk, J. Hartmann, A. Meyer-Larsen, Rodney Walker, O. Schwarzer, Z. Duliński, J.D. McFall, C. Voci, M. Rohde, A. Bertolin, R. Kerger, K. Jelen, O. Ruske, W.R. Frisken, T. W. Jones, G. L. Bashindzhagyan, C. M. Ginsburg, D. Sideris, S. Ritz, Costas Foudas, J. F. de Trocóniz, L. Zawiejski, Roberto Cirio, D. Hasell, G. D'Agostini, Tachishige Hirose, D. B. Miller, S. Sampson, A. Caldwell, R. Cross, T. Y. Ling, U. Schneekloth, W.B. Schmidke, A. Bornheim, M. Basile, J. Gilmore, I. Butterworth, A. Pellegrino, T. Haas, F. Anselmo, Robert Klanner, Y. Iga, V. W. Hughes, Alexander Kappes, A. Vaiciulis, T. Nishimura, Claudia Glasman, A. M. Czermak, E. Paul, J. M. Hernandez, T. Matsushita, G.P. Heath, A. Stifutkin, F. Goebel, H. F.W. Sadrozinski, Luca Stanco, Lev Khein, R. Stroili, N. Coppola, S. Kananov, J. K. Sedgbeer, O. Yu. Lukina, G. Bruni, B. Surrow, A. Nigro, Jongmin Lee, C. L. Kim, B. Foster, P.F. Ermolov, J. Y. Kim, Pietro Antonioli, Luisa Cifarelli, Neville Harnew, K. Hebbel, Cd Catterall, S.A. Zotkin, A. Pesci, Ben Bylsma, J. Milewski, M. Bukowy, H. Hartmann, W. Liu, Sridhara Dasu, S Campbell-Robson, Halina Abramowicz, E. A. Heaphy, A. Seiden, I. Suzuki, J.H. Vossebeld, M. Raso, A. Eskreys, A. T. Doyle, L. Labarga, Wouter Verkerke, B. A. Dolgoshein, Marta Ruspa, D. Kçira, Ian Brock, E. Strickland, T.P. Shah, Mark Sutton, S. M. Wang, D. H. Saxon, D. Westphal, U. Karshon, P. Göttlicher, Luis Hervas, D. Boscherini, M. I. Martínez, Roberto Sacchi, G. Castellini, W.N. Murray, M. Kuze, Aharon Levy, Laurel E. Sinclair, A. Prinias, Elisabetta Gallo, P. Giusti, W. Koch, S. Polenz, H. Beier, G. Drews, J. Große-Knetter, W. Hain, Tadeusz Kowalski, G. Poelz, J. P. Fernandez, I. A. Korzhavina, R.C.E. Devenish, Q. Zhu, S. W. Nam, N. Macdonald, J.J. Engelen, G. Laurenti, Anselmo Margotti, L.W. Wiggers, and L. Iannotti

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, Perturbative QCD, Particle accelerator, HERA, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

The photoproduction reaction γp → μ+ μ-p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2pb-1. The Υ meson has been observed in photoproduction for the first time. The sum of the products of the elastic Υ(1S), Υ(2S),Υ(3S) photoproduction cross sections with their respective branching ratios is determined to be 13.3 ± 6.0(stat.)-2.3+2.7(syst.) pb at a mean photon-proton centre of mass energy of 120 GeV. The cross section is above the prediction of a perturbative QCD model. © 1998 Elsevier Science B.V. All rights reserved.

11. Observation of scaling violations in scaled momentum distributions at HERA

Author

J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave, J Repond, R Stanek, R.L Talaga, R Yoshida, H Zhang, M.C.K Mattingly, F Anselmo, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, G Cara Romeo, G Castellini, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, I Gialas, P Giusti, G Iacobucci, G Laurenti, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, A Polini, F Ricci, G Sartorelli, Y Zamora Garcia, A Zichichi, C Amelung, A Bornheim, I Brock, K Coböken, J Crittenden, R Deffner, M Eckert, M Grothe, H Hartmann, K Heinloth, L Heinz, E Hilger, H.-P Jakob, U.F Katz, R Kerger, E Paul, M Pfeiffer, Ch Rembser, J Stamm, R Wedemeyer, H Wieber, D.S Bailey, S Campbell-Robson, W.N Cottingham, B Foster, R Hall-Wilton, M.E Hayes, G.P Heath, H.F Heath, J.d McFall, D Piccioni, D.G Roff, R.J Tapper, M Arneodo, R Ayad, M Capua, A Garfagnini, L Iannotti, M Schioppa, G Susinno, J.Y Kim, J.H Lee, I.T Lim, M.Y Pac, A Caldwell, N Cartiglia, Z Jing, W Liu, B Mellado, J.A Parsons, S Ritz, S Sampson, F Sciulli, P.B Straub, Q Zhu, P Borzemski, J Chwastowski, A Eskereys, J Figiel, K Klimek, M.B Przybycień, L Zawiejski, L Adamczyk, B Bednarek, M Bukowy, 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, U Fricke, D.J Gilkinson, C Glasman, P Göttlicher, T Haas, W Hain, D Hasell, K.F Johnson, M Kasemann, W Koch, U Kötz, H Kowalski, J Labs, L Lindemann, B Löhr, M Löwe, O Mańczak, J Milewski, T Monteiro, J.S.T Ng, D Notz, K Ohrenberg, I.H Park, A Pellegrino, F Pelucchi, K Piotrzkowski, M Roco, M Rohde, J Roldán, J.J Ryan, A.A Savin, U Schneekloth, F Selonke, B Surrow, E Tassi, T Voß, D Westphal, G Wolf, U Wollmer, C Youngman, A.F Żarnecki, W Zeuner, B.D Burow, H.J Grabosch, A Meyer, S Schlenstedt, G Barbagli, E Gallo, P Pelfer, G Maccarrone, L Votano, A Bamberger, S Eisenhardt, P Markun, T Trefzger, S Wölfle, J.T Bromley, N.H Brook, P.J Bussey, A.T Doyle, N Macdonald, D.H Saxon, L.E Sinclair, E Strickland, R Waugh, I Bohnet, N Gendner, U Holm, A Meyer-Larsen, H Salehi, K Wick, L.K Gladilin, D Horstmann, D Kçira, R Klanner, E Lohrmann, G Poelz, W Schott, F Zetsche, T.C Bacon, I Butterworth, J.E Cole, G Howell, B.H.Y Hung, L Lamberti, K.R Long, D.B Miller, N Pavel, A Prinias, J.K Sedgbeer, D Sideris, U Mallik, S.M Wang, J.T Wu, P Cloth, D Filges, J.I Fleck, T Ishii, M Kuze, I Suzuki, K Tokushuku, S Yamada, K Yamauchi, Y Yamazaki, S.J Hong, S.B Lee, S.W Nam, S.K Park, F Barreiro, J.P Fernándeza, G García, R Graciani, J.M Hernández, L Hervás, L Labarga, M Martínez, J del Peso, J Puga, J Terrón, J.F de Trocóniz, F Corriveau, D.S Hanna, J Hartmann, L.W Hung, W.N Murray, A Ochs, M Riveline, D.G Stairs, M St-Laurent, R Ullmann, T Tsurugai, V Bashkirov, B.A Dolgoshein, A Stifutkin, G.L Bashindzhagyan, P.F Ermolov, Yu.A Golubkov, L.A Khein, N.A Korotkova, I.A Korzhavina, V.A Kuzmin, O.Yu Lukina, A.S Proskuryakov, L.M Shcheglova, A.N Solomin, S.A Zotkin, C Bokel, M Botje, N Brümmer, F Chlebana, J Engelen, E Koffeman, P Kooijman, A van Sighem, H Tiecke, N Tuning, W Verkerke, J Vossebeld, M Vreeswijk, L Wiggers, E de Wolf, D Acosta, B Bylsma, L.S Durkin, J Gilmore, C.M Ginsburg, C.L Kim, T.Y Ling, P Nylander, T.A Romanowski, H.E Blaikley, R.J Cashmore, A.M Cooper-Sarkar, R.C.E Devenish, J.K Edmonds, J Große-Knetter, N Harnew, M Lancaster, C Nath, V.A Noyes, A Quadt, O Ruske, J.R Tickner, H Uijterwaal, R Walczak, D.S Waters, A Bertolin, R Brugnera, R Carlin, F Dal Corso, U Dosselli, S Limentani, M Morandin, M Posocco, L Stanco, R Stroili, C Voci, J Bulmahn, B.Y Oh, J.R Okrasiński, W.S Toothacker, J.J Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, M Raso, J.C Hart, N.A McCubbin, T.P Shah, D Epperson, C Heusch, J.T Rahn, H.F.-W Sadrozinski, A Seiden, R Wichmann, D.C Williams, O Schwarzer, A.H Walenta, H Abramowicz, G Briskin, S Dagan, S Kananov, A Levy, T Abe, T Fusayasu, M Inuzuka, K Nagano, K Umemori, T Yamashita, R Hamatsu, T Hirose, K Homma, S Kitamura, T Matsushita, R Cirio, M Costa, M.I Ferrero, S Maselli, V Monaco, C Peroni, M.C Petrucci, M Ruspa, R Sacchi, A Solano, A Staiano, M Dardo, D.C Bailey, C.-P Fagerstroem, R Galea, G.F Hartner, K.K Joo, G.M Levman, J.F Martin, R.S Orr, S Polenz, A Sabetfakhri, D Simmons, R.J Teuscher, J.M Butterworth, C.D Catterall, T.W Jones, J.B Lane, R.L Saunders, J Shulman, M.R Sutton, M Wing, J Ciborowski, G Grzelak, M Kasprzak, K Muchorowski, R.J Nowak, J.M Pawlak, R Pawlak, T Tymieniecka, A.K Wróblewski, J.A Zakrzewski, M Adamus, C Coldewey, Y Eisenberg, D Hochman, U Karshon, W.F Badgett, D Chapin, R Cross, S Dasu, C Foudas, R.J Loveless, S Mattingly, D.D Reeder, W.H Smith, A Vaiciulis, M Wodarczyk, S Bhadra, W.R Frisken, M Khakzad, W.B Schmidke, and Zeus (IHEF, IoP, FNWI)

Subjects
ZEUS, CENTRAL TRACKING DETECTOR, ZEUS BARREL CALORIMETER, FRAGMENTATION FUNCTIONS, E+E-ANNIHILATION, MASS-ENERGY, QCD, PROTON, CONSTRUCTION, DESIGN, SCATTERING, Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Large range, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Scaling, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, Scattering, Detector, HERA, Deep inelastic scattering, Charged particle, High Energy Physics::Experiment
Abstract

Charged particle production has been measured in deep inelastic scattering (DIS) events over a large range of $x$ and $Q^2$ using the ZEUS detector. The evolution of the scaled momentum, $x_p$, with $Q^2,$ in the range 10 to 1280 $GeV^2$, has been investigated in the current fragmentation region of the Breit frame. The results show clear evidence, in a single experiment, for scaling violations in scaled momenta as a function of $Q^2$., Comment: 21 pages including 4 figures, to be published in Physics Letters B. Two references added

12. Diffractive dijet cross sections in photoproduction at HERA

Author

Ada Solano, L. Lamberti, B. Surrow, Jongmin Lee, S. Limentani, Thomas Trefzger, K.F. Johnson, M. Kuze, S. Polenz, Vladimir Bashkirov, I. T. Lim, S. Bhadra, J. Bulmahn, P. Giusti, K. Hebbel, J. F. Martin, J. P. Fernandez, I. O. Skillicorn, Andrea Contin, A. Nigro, G. Drews, W. N. Murray, J. Große-Knetter, J. A. Parsons, C. L. Kim, W. Schott, Cd Catterall, W. Hain, Y. Zamora Garcia, A. Ochs, I. A. Korzhavina, T. Monteiro, H.-P. Jakob, R. L. Saunders, S. Sampson, R. Cross, G. Grzelak, T. C. Bacon, C.-P. Fagerstroem, A. N. Solomin, A. Prinias, Elisabetta Gallo, Costas Foudas, Marcella Capua, R. S. Orr, P. B. Straub, Kenneth Long, R. Yoshida, B.D. Burow, Francois Corriveau, Hartmut Sadrozinski, W. Koch, H.G.J.M. Tiecke, U. Mallik, Greg P Heath, Marco Schioppa, N.C. Brummer, J. Gilmore, R. Brugnera, F. Palmonari, A. Kotański, L.A.T. Bauerdick, S. De Pasquale, N. Coppola, B. A. Dolgoshein, G. Bari, J. M. Pawlak, S. W. Nam, N. Macdonald, Ulf Behrens, Federico Cindolo, S. Wölfle, Lucia Votano, C. Nath, O. Yu. Lukina, J.R. Okrasiński, Amedeo Staiano, J.J. Engelen, Z. Jing, D. Krakauer, M. Pfeiffer, P. G. Pelfer, H. Beier, Tadeusz Kowalski, S. A. Zotkin, A. Garfagnini, B. Bednarek, M. Inuzuka, S. Ritz, Amanda Cooper-Sarkar, D. C. Bailey, A. Sabetfakhri, C. Youngman, Jose Repond, A. Meyer, K. Umemori, Hao Zhang, D. Epperson, N. Cartiglia, D. S. Hanna, D. Filges, Yuji Yamazaki, Miriam Lucio Martinez, S. B. Lee, Anselmo Margotti, G. Poelz, A. Stifutkin, E. Rulikowska-Zarbska, J. D. McFall, L.W. Wiggers, Claudia Glasman, A. Quadt, F. Zetsche, W. S. Toothacker, R. Stanek, S. K. Dhawan, J.T. Wu, P.F. Ermolov, G. Howell, Giuseppe Levi, Gm Levman, Roberto Sacchi, M. Eckert, N.A. Korotkova, L. Bellagamba, D. Westphal, J. T. Rahn, U. Karshon, D Piccioni, S. Eisenhardt, J.B. Lane, W. H. Smith, Gy. Wolf, T. Ishii, D. S. Waters, Michele Arneodo, R. Kerger, K. Jelen, O. Ruske, Luis Hervas, D. Boscherini, Joanne Cole, B. Löhr, D. Mikunas, J.I. Fleck, L. Lindemann, J. Del Peso, J. A. Zakrzewski, L. M. Shcheglova, A. Bruni, Luca Stanco, Lev Khein, Mário Costa, H. Kowalski, Katsuo Tokushuku, R. J. Tapper, S. Kitamura, Aharon Levy, D. Hasell, Danuta Kisielewska, G. D'Agostini, R.C.E. Devenish, K. Homma, Alexander Kappes, W.R. Frisken, G. Castellini, J.S.T. Ng, S. Mattingly, L. Suszycki, G. Briskin, P.M. Kooijman, Umberto Dosselli, Q. Zhu, Jens Hartmann, Janusz Chwastowski, F. J. Sciulli, WN Cottingham, Giuseppe Iacobucci, J.K. Edmonds, A.I. van Sighem, Matthew Wing, K. Wick, Fernando Barreiro, Enrico Tassi, J. J. Whitmore, G. Abbiendi, D.D. Reeder, M. Wodarczyk, T. Y. Ling, Robert Klanner, A. Vaiciulis, U. Holm, S. Kananov, J. K. Sedgbeer, R. Pawlak, E. A. De Wolf, P. Nylander, K. K. Joo, J. R. Tickner, G. Laurenti, Y. Eisenberg, F. Dal Corso, Giancarlo Susinno, T. Massam, I. Gialas, G. Bruni, Laurel E. Sinclair, Mauro Morandin, M.A.J. Botje, Guillaume Garcia, L. W. Hung, M. Riveline, R. Walczak, U. Schneekloth, Jan Figiel, I. Bohnet, K. Heinloth, Tomohiro Abe, K. Coböken, Abhay Deshpande, P. Markun, G. F. Hartner, Roberto Carlin, W.F. Badgett, I. Butterworth, N. Tuning, K. Desler, Krzysztof Piotrzkowski, S. Magill, Giuseppe Barbagli, H. Wieber, J. Roldán, I.H. Park, A. Bornheim, Leszek Adamczyk, James Crittenden, Af Zarnecki, Y. Iga, A. Pesci, R. Wichmann, U. F. Katz, D. Chapin, R. Waugh, M. Y. Pac, A. Seiden, M.I. Ferrero, M. St-Laurent, Rodney Walker, O. Schwarzer, A. Meyer-Larsen, A. M. Czermak, Ben Bylsma, J. Milewski, G. Sartorelli, Ta Romanowski, M. Przybycien, B. Mellado, Z. Duliński, I. Suzuki, L. Iannotti, S. Yamada, A.A. Savin, D. S. Bailey, J.H. Vossebeld, M. Bukowy, M. Grothe, L. Heinz, A. Bertolin, M. C. Petrucci, K. Klimek, Giovanni Maccarrone, D. Hochman, J. Zajc, M. Raso, A. Eskreys, A. T. Doyle, S. Schlenstedt, P. J. Bussey, H. Hartmann, J. K. Bienlein, L. Labarga, T. Tsurugai, R. L. Talaga, S. Stonjek, J. F. de Trocóniz, Jonathan Butterworth, Jose M Hernandez, L. Zawiejski, Roberto Cirio, S. Dagan, C. Voci, Marta Ruspa, M. Khakzad, U. Fricke, W. Liu, V. A. Kuzinin, C. A. Heusch, C. M. Ginsburg, Yu. A. Golubkov, D. Kçira, B. Musgrave, Ian Brock, E. Lohrmann, M. Posocco, E. Paul, Sridhara Dasu, E. Strickland, Halina Abramowicz, T.P. Shah, Mark Sutton, L.K. Gladilin, S. M. Wang, D. H. Saxon, H.E. Blaikley, J. Ciborowski, R. Ullmann, T. Yamashita, P. Göttlicher, K. Yamauchi, M. Dardo, C. Coldewey, H. Raach, A. Polini, Matthias Kasemann, H. Salehi, P. Borzemski, D. Notz, M. Milite, W. Verkerke, T. W. Jones, Antonino Zichichi, G. L. Bashindzhagyan, W.B. Schmidke, R. J. Teuscher, J.J. Ryan, D.C. Williams, DG Roff, J. Stamm, B. Foster, D. Sideris, J. Y. Kim, Pietro Antonioli, D. B. Miller, Luisa Cifarelli, Neville Harnew, M. Basile, A. Pellegrino, T. Haas, F. Anselmo, V. W. Hughes, Richard Hall-Wilton, Silvia Maselli, J.T. Bromley, D. Horstmann, D. Acosta, N. H. Brook, Dg Stairs, Vincenzo Monaco, M. Rohde, R. Graciani, P. Cloth, R. Ayad, G. Cara Romeo, Tachishige Hirose, T. Matsushita, F. Goebel, R. Stroili, N. Pavel, Juan Terron, M. Kasprzak, R. Loveless, T. Fusayasu, Mariusz Przybycien, M. Corradi, C.H. Bokel, V.A. Noyes, S. J. Hong, S. Campbell-Robson, M. E. Hayes, N. A. McCubbin, H.J. Grabosch, A.S. Proskuryakov, Helen F Heath, U. Wollmer, D. Simmons, John Hart, M.C.K. Mattingly, L. S. Durkin, R. Hamatsu, J. Puga, Els Koffeman, K. Nagano, R. Deffner, M. Adamus, G. Marini, Wolfram Dietrich Zeuner, A.K. Wróblewski, A. Bamberger, Allen Caldwell, Cristiana Peroni, R. J. Cashmore, M. Derrick, T. Tymieniecka, U. Kötz, N. Gendner, O. Deppe, J. Breitweg, R. J. Nowak, F. Selonke, E. Hilger, R. Galea, F. Pelucchi, B.Y. Oh, C. Amelung, Rosario Nania, and Sung Keun Park

Subjects
Particle physics, Physics and Astronomy (miscellaneous), LUND MONTE-CARLO, Parton, 01 natural sciences, Zeus (malware), JET FRAGMENTATION, Nuclear physics, DEEP-INELASTIC SCATTERING, Pomeron, 0103 physical sciences, Rapidity, 010306 general physics, Engineering (miscellaneous), Quantum chromodynamics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, ZEUS, LARGE RAPIDITY GAP, POMERON STRUCTURE, PARTON DISTRIBUTIONS, PERTURBATION-THEORY, HARD SCATTERING, HERA, Deep inelastic scattering, Gluon, High Energy Physics::Experiment
Abstract

Differential dijet cross sections have been measured with the ZEUS detector for photoproduction events in which the hadronic final state containing the jets is separated with respect to the outgoing proton direction by a large rapidity gap. The cross section has been measured as a function of the fraction of the photon (ϰγOBS) and pomeron (βOBS) momentum participating in the production of the dijet system. The observed ϰγOBS dependence shows evidence for the presence of a resolved- as well as a direct-photon component. The measured cross section da/dβOBS increases as βOBS increases indicating that there is a sizeable contribution to dijet production from those events in which a large fraction of the pomeron momentum participates in the hard scattering. These cross sections and the ZEUS measurements of the diffractive structure function can be described by calculations based on parton densities in the pomeron which evolve according to the QCD evolution equations and include a substantial hard momentum component of gluons in the pomeron.

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