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116 results on '"Caccia M."'

1. A new tow maneuver of a damaged boat through a swarm of autonomous sea drones

Author

Nesi, L., Pepe, G., Bibuli, M., Zereik, E., Carcaterra, A., and Caccia, M.

Abstract

Given the huge rising interest in autonomous drone swarms to be employed in actual marine applications, the present paper explores the possibility to recover a distressed vessel by means of the other agents belonging to the swarm itself. Suitable approaches and control strategies are developed and tested to find the highest performance algorithms. Different rules are exploited to obtain a correct behaviour in terms of swarm interaction, namely collective and coordinated, and individual. An innovative feedback control strategy is adopted and demonstrated its effectiveness. Extensive simulation runs have been conducted, whose results validate the approach.

Published
2019
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2. Ceramic–metal composites for heat exchangers in concentrated solar power plants

Author

Caccia, M., Tabandeh-Khorshid, M., Itskos, G., Strayer, A. R., Caldwell, A. S., Pidaparti, S., Singnisai, S., Rohskopf, A. D., Schroeder, A. M., Jarrahbashi, D., Kang, T., Sahoo, S., Kadasala, N. R., Marquez-Rossy, A., Anderson, M. H., Lara-Curzio, E., Ranjan, D., Henry, A., and Sandhage, K. H.

Abstract

The efficiency of generating electricity from heat using concentrated solar power plants (which use mirrors or lenses to concentrate sunlight in order to drive heat engines, usually involving turbines) may be appreciably increased by operating with higher turbine inlet temperatures, but this would require improved heat exchanger materials. By operating turbines with inlet temperatures above 1,023 kelvin using closed-cycle high-pressure supercritical carbon dioxide (sCO2) recompression cycles, instead of using conventional (such as subcritical steam Rankine) cycles with inlet temperatures below 823 kelvin1–3, the relative heat-to-electricity conversion efficiency may be increased by more than 20 per cent. The resulting reduction in the cost of dispatchable electricity from concentrated solar power plants (coupled with thermal energy storage4–6) would be an important step towards direct competition with fossil-fuel-based plants and a large reduction in greenhouse gas emissions7. However, the inlet temperatures of closed-cycle high-pressure sCO2turbine systems are limited8by the thermomechanical performance of the compact, metal-alloy-based, printed-circuit-type heat exchangers used to transfer heat to sCO2. Here we present a robust composite of ceramic (zirconium carbide, ZrC) and the refractory metal tungsten (W) for use in printed-circuit-type heat exchangers at temperatures above 1,023 kelvin9. This composite has attractive high-temperature thermal, mechanical and chemical properties and can be processed in a cost-effective manner. We fabricated ZrC/W-based heat exchanger plates with tunable channel patterns by the shape-and-size-preserving chemical conversion of porous tungsten carbide plates. The dense ZrC/W-based composites exhibited failure strengths of over 350 megapascals at 1,073 kelvin, and thermal conductivity values two to three times greater than those of iron- or nickel-based alloys at this temperature. Corrosion resistance to sCO2at 1,023 kelvin and 20 megapascals was achieved10by bonding a copper layer to the composite surface and adding 50 parts per million carbon monoxide to sCO2. Techno-economic analyses indicate that ZrC/W-based heat exchangers can strongly outperform nickel-superalloy-based printed-circuit heat exchangers at lower cost.

Published
2018
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4. Priority Task Approach for USVs’ Path Following Missions with Obstacle Avoidance and Speed Regulation

Author

Zereik, E., Sorbara, A., Bibuli, M., Bruzzone, G., and Caccia, M.

Abstract

Marine robotics is becoming increasingly more effective and useful for many applications in the real world. This process of technological transfer strongly needs the actual achievement of full autonomy and high reliability of the robotics systems. Hence, many works conducted by the marine robotics community are aimed to further enhance control techniques to end up with complex autonomous systems endowed with high robustness and reliability. The present paper faces these problems, adapting and applying to unmanned marine vehicles a technique that usually is exploited for robotic manipulators. In particular, the problem of path following is addressed and a navigation guidance and control system based on a priority task approach is developed. Such a control paradigm allows to separate the different tasks required to the robot and to combine them into an overall ‘emerging behaviour'. Moreover, one of its great advantages is the high system flexibility: additional control tasks can be included later, leaving the architecture unchanged. The case of three different control tasks is addressed in the present work, namely path following, obstacle avoidance and speed regulation. The approach has been validated through extensive simulative campaigns; experimental tests are planned and will be conducted in the very next future

Published
2015
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5. Improving Automatic Target Recognition with Forward Looking Sonar Mosaics

Author

Ferreira, F., Djapic, V., Micheli, M., and Caccia, M.

Abstract

Automatic Target Recognition (ATR) is a key element needed to make Mine Countermeasure missions using robots entirely autonomous. While there has been much progress in applying ATR algorithms on high-resolution Synthetic Aperture Sonar (SAS) and sidescan sonar data, performing ATR with a low cost Forward Looking Sonar (FLS) is much more challenging. An algorithm for the detection of underwater man-made objects in FLS previously developed can work in real-time although it suffers considerably from typical noise in sonar images and false alarms. The work presented here shows that ATR algorithms can be exercised on sonar mosaics built also in real-time instead of raw data coming from the FLS. The use of mosaics can help the detection of the targets by reducing some noise (including harmonics from other acoustic devices mounted on the robot) and giving a better contrast to the images to be processed. Moreover, mosaic images can be useful for post-processing and data analysis. The mosaicking algorithm also runs in real-time to maintain the performance of the system and to be useful in real missions. It was tested both on data previously collected and in real experiments with different set-ups and with different sonars. The wide range of results obtained with different surface vehicles and in different situations demonstrate the usefulness of the method.

Published
2014
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6. Discrete-time Sliding Mode Control for Guidance of an Unmanned Surface Vehicle

Author

Bibuli, M., Bruzzone, G., Caccia, M., Ippoliti, G., Longhi, S., Orlando, G., and Pelusi, G.M.

Abstract

This paper discusses the Navigation, Guidance and Control (NGC) system of an Unmanned Surface Vehicle (USV) through extended numerical tests carried out with the prototype autonomous catamaran Charlie. A cascade control scheme is proposed which provides accurate straight line following performance with an USV equipped only with a GPS, a compass and an extended Kalman filter to estimate the vehicle position and speed. In the considered solution an outer Discrete-Time Sliding Mode Control (DTSMC) loop is designed for the guidance of the USV and an inner PI-based gain scheduling control loop regulates the vehicle linear and angular speed. Reported numerical tests show that the adopted control scheme produces good performance for straight lines following tasks.

Published
2012
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7. Application of Fault Detection and Isolation Techniques on an Unmanned Surface Vehicle (USV)

Author

Zanoli, S.M., Astolfi, G., Bruzzone, G., Bibuli, M., and Caccia, M.

Abstract

The detection and the isolation of a common fault occurred in an Unmanned Surface Vehicle (USV) is presented. A data-driven, model-free technique based on the Principal Components Analysis (PCA) technique is used to formulate the fault detection problem. This choice is particularly suited for applications on underwater robotic vehicles where, in general, dynamic models are not available or not appropriate for fault detection purposes. Tests performed on telemetry data acquired during field operations show that the presented approach is practical and effective to cope with unexpected environmental situations.

Published
2012
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8. Cooperative Autonomous Robotic Towing system: definition of requirements and operating scenarios

Author

Ardito, S., Lazarevs, D., Vasiliniuc, B., Vukic, Z., Masabayashi, K., and Caccia, M.

Abstract

The project CART (Cooperative Autonomous Robotic Towing system) proposes a new concept for salvage operations of distressed ships at sea based on the development of robotised unmanned marine platforms able to (semi-)automatically execute the high risk operation of linking the emergency towing system of distressed ships to towing vessels. The CART device will be able to optimize the operations for safeguarding the environment, helping to prevent oil pollution at sea, and minimizing the risk for human lives. This paper presents user requirements and operating scenarios for the development of a prototype system able to support the in-field validation of the proposed concept.

Published
2012
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9. The European R&D-Project MORPH: Marine robotic systems of self-organizing, logically linked physical nodes

Author

Kalwa, J., Pascoal, A., Ridao, P., Birk, A., Eichhorn, M., Brignone, L., Caccia, M., Alves, J., and Santos, R.S.

Abstract

The MORPH project (FP 7, 2012-2016) advances the novel concept of an underwater robotic system composed of a number of spatially separated mobile robot-modules, carrying complementary resources. Instead of being physically coupled, the modules are connected via communication links that rely on the flow of information among them, i. e. inter-module interactions are enabled by underwater communication networks at distant and close ranges and supported by visual perception at very close range. Without rigid links, the MSV can reconfigure itself and adapt in response to the shape of the terrain, including walls with negative slope.

Published
2012
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10. Comparing region-based and feature-based methods for ROV vision-based motion estimation

Author

Ferreira, F., Veruggio, G., Caccia, M., and Bruzzone, G.

Abstract

In this work, a comparison between different region-based and feature-based techniques used to estimate the motion of an underwater Remotely Operated Vehicle (ROV) is performed. In what respects region-based detectors, the article compares a previously analyzed template correlation technique with Maximally stable extremal regions (MSER). In previous works, the template correlation method proved to be the best (both in robustness to noise and computational time) when compared with several feature detectors (and descriptors) namely Scale Invariant Feature Transform (SIFT), Speeded Up Robust Features (SURF), Center Surround Extrema (CenSurE), Features from Accelerated Segment Test (FAST), Binary Robust Independent Elementary Features (BRIEF) and Oriented FAST and Rotated BRIEF (ORB). Therefore, the need of comparing it with other region-based detectors arises. Nonetheless, previously untested detectors are now tested combined with BRIEF descriptors due to the good results obtained with BRIEF descriptors in previous works.

Published
2012
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11. Response of Silicon photo-multipliers to a constant light flux

Author

Caccia, M., Bulgheroni, A., Cappellini, C., Chmill, V., Ramilli, M., and Risigo, F.

Subjects
*SILICON diodes, *PHOTOMULTIPLIERS, *AVALANCHE diodes, *PHOTON detectors, *RADIATION dosimetry, *MAMMOGRAMS
Abstract

The response of a Silicon Photomultiplier to a constant illumination has been interpreted in term of Geiger-Mueller avalanche frequency, actually correlated to the photon flux via the photon detection efficiency. The hypothesis has been verified in laboratory tests and applied throughout the development of a device for real-time dosimetry in mammography. [Copyright &y& Elsevier]

Published
2009
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12. Excited-State Lifetime Assay for Protein Detection on Gold Colloids−Fluorophore Complexes

Author

Freddi, S., D’Alfonso, L., Collini, M., Caccia, M., Sironi, L., Tallarida, G., Caprioli, S., and Chirico, G.

Abstract

The interaction of the surface plasmons of gold nanoparticles (NP) a few nanometers in size with fluorophores can be used to engineer their fluorescence properties. This possibility can be exploited in principle to obtain nanodevices for protein−protein recognition. We studied different types of constructs based on gold NPs on which derivatives of fluorescein were bound. The interaction of this fluorophore with the gold surface plasmon resonances, mainly occurring through quenching, affects its excited-state lifetime that is measured by fluorescence burst analysis in standard solutions. The binding of proteins to the gold NPs through antigen−antibody recognition further modifies the dye excited-state lifetime. This change can therefore be used to measure the protein concentration. The data reported here indicate that one can measure the concentration of bovine serum albumine in solution with an apparent limit of detection of 5 ± 2 pM.

Published
2009
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13. Vision-based ROV horizontal motion control

Author

Caccia, M.

Abstract

The problem of high precision motion control of remotely operated vehicles (ROVs) in the proximity of the seabed through vision-based motion estimation is addressed in this paper. The proposed approach consists in the integration of a monocular vision system for the estimate of the vehicle's linear motion with a dual-loop hierarchical architecture for kinematics and dynamics control. Results obtained by operating at sea the Romeo ROV are presented, pointing out the role played by the mechanical design of the actuation and illumination systems in achieving satisfactorily performance in operating conditions.

Published
2004
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14. Biomedical applications of high energy physics solid state sensors and electronics

Author

Caccia, M.

Subjects
*BIOCOMPATIBILITY, *PARTICLE physics, *RESEARCH & development, *PHYSICS
Abstract

The Research & Development on position sensitive solid state detectors for current and future High Energy Physics experiments triggered several projects based on the same know-how and oriented towards biomedical applications. The general characteristics of these detectors are reviewed, together with a few specific examples. [Copyright &y& Elsevier]

Published
2003
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15. Pitch and roll disturbance rejection in vision-based linear speed estimation for UUVs

Author

Caccia, M.

Abstract

The problem of characterizing and rejecting disturbances induced on vision-based UUV horizontal speed estimates by small pitch and roll oscillations is faced in this paper. Difficulties in inter-calibration between inclinometers and video-based motion estimators are discussed, and a suitable filtering technique, based on the frequency analysis of pitch and roll oscillations, speed measurement disturbances, and system dynamics, is proposed and evaluated on the basis of experiments carried out at sea with the Romeo ROV in operating conditions.

Published
2003
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16. Internet-Based Teleoperation of the Romeo ROV in the Arctic Region

Author

Bruzzone, G., Bono, R., Caccia, M., Coletta, P., and Veruggio, G.

Abstract

In this paper the Internet-based teleoperation system of the underwater vehicle Romeo, and some relevant experiments performed in field, will be described. Romeo is the latest ROV (Remotely Operated Vehicle) prototype for scientific applications and robotics research developed by Robotlab, the Robotics Group of the CNR-ISSIA Genoa Branch. In these last years there has been an increasing effort at Robotlab in designing, developing and building a complete software and hardware communication infrastructure for ROVs that might enable a fruitful and effective Internet teleoperation. Operating in this research framework, in September 2002, in the course of a campaign performed in the Arctic Region, some Internet-based teleoperation tests of Romeo were carried out. During the experiments, some marine scientists connected to the World Wide Web had the opportunity, acting from the comfort of their labs, to remotely operate the ROV immerse in the Kongsfjord in Norway and to explore the seabed taking photographs of the marine flora and fauna.

Published
2003
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17. SESAMO: An autonomous surface vessel for the study and characterization of the air-sea interface

Author

Caccia, M., Bono, R., Bruzzone, Ga., Bruzzone, Gi., Spirandelli, E., Veruggio, G., Capodaglio, G., and Stortini, A.M.

Abstract

The project SESAMO focusing on the development of an autonomous catamaran for data acquisition and sampling for biological, chemical and physical investigations on the air-sea interface is presented. In particular, the SESAMO platform will be equipped with modules for the collection of surface micro layer, sampling of subsurface water, and survey in situ of water column and atmosphere parameters, along paths specified by the scientific end-users. At the end of the project, which is funded in the framework of the Italian National Program of Research in Antarctica, the performances of the autonomous sampling system will be evaluated through comparison of the data acquired in Antarctic areas of interest by the already operating Multi-Use Microlayer Sampler MUMS.

Published
2003
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18. Execution Control and Reconfiguration of Navigation, Guidance and Control Tasks for UUVs

Author

Bruzzone, G., Caccia, M., Coletta, P., and Veruggio, G.

Abstract

In this paper the reconfiguration capabilities of a control architecture for Remotely Operated Vehicles (ROVs) are investigated. The design of the control architecture is based on the idea to use the Petri net formalism. The "safe" behavior of the architecture is guaranteed by enforcing some place invariants on the marking of the net. Moreover, the Petri net representation of the control architecture lets one to use an unfolding technique to explore the reachable configurations in an efficient way. Preliminary simulation results are shown, which demonstrate the feasibility of the proposed technique.

Published
2003
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19. Internet-Based Teleoperation of Underwater Vehicles

Author

Bruzzone, Ga, Bono, R., Bruzzone, Gi, Caccia, M., Coletta, P., Spirandelli, E., and Veruggio, G.

Abstract

In this paper the complete software and hardware communication infrastructure for Internet teleoperation of ROVs, developed by the Robotlab (the Robotics Group ofthe CNR-ISSIA Genoa Branch) will be described. The basic aim of an Internet robotic teleoperation system is to furnish the possibility, for a common user, having a standard connection to the World Wide Web, of easily teleoperating a robot located anywhere in the world from the comfort of his/her home or lab. In the case of marine applications, there is a great interest to succeed in allowing to scientific end-users, e.g. oceanographers, biologists and geologists, to control from their labs the execution of scientific missions carried out by underwater vehicles operating with strict interactions with the environment in remote and harsh sites. Operating in this research framework, a number of Internetbased teleoperation experiments of Romeo, the latest ROV (Remotely Operated Vehicle) built by Robotlab, in order to evaluate the possibility of executing reliable Internet teleoperation of remote robotic systems in actual operating conditions.

Published
2003
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20. Bottom-Following for Remotely Operated Vehicles: Algorithms and Experiments

Author

Caccia, M., Bruzzone, G., and Veruggio, G.

Abstract

This paper addresses the problem of designing high precision bottom followers for remotely operated vehicles. In the framework of hierarchical control architectures able to uncouple the robot's kinematics (guidance) and dynamics (velocity control), the task of bottom-following is accomplished by suitable guidance task functions, which enable the system to handle unmodeled, i.e., not measured or estimated, kinematics interactions between the robot and the operating environment. In order to increase the bottom followers' reliability, the paper discusses possible techniques for modeling and handling the environmental and measurement uncertainty in the estimate of the local interactions between the vehicle and the operating environment, i.e., altitude and bottom slope. In particular, according to at-sea operational experience, the problem of managing dropouts due to erroneous tracking of multi-path echoes by the ROV altimeter(s) is addressed. Results of a large set of pool trials carried out with the Romeo ROV are reported and discussed.

Published
2003
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21. Single intermediate vector boson production in e+e−collisions at s=183and 189 GeV

Author

Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Albrecht, Z., Alderweireld, T., Alekseev, G.D., Alemany, R., Allmendinger, T., Allport, P.P., Almehed, S., Amaldi, U., Amapane, N., Amato, S., Anashkin, E., Anassontzis, E.G., Andersson, P., Andreazza, A., Andringa, S., Anjos, N., Antilogus, P., Apel, W.-D., Arnoud, Y., Åsman, B., Augustin, J.-E., Augustinus, A., Baillon, P., Ballestrero, A., Bambade, P., Barao, F., Barbiellini, G., Barbier, R., Bardin, D.Y., Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K.-H., Begalli, M., Behrmann, A., Bellunato, T.F., Belokopytov, Yu., Benekos, N.C., Benvenuti, A.C., Berat, C., Berggren, M., Berntzon, L., Bertrand, D., Besancon, M., Besson, N., Bilenky, M.S., Bloch, D., Blom, H.M., Bol, L., Bonesini, M., Boonekamp, M., Booth, P.S.L., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bowcock, T.J.V., Boyko, I., Bozovic, I., Bozzo, M., Bracko, M., Branchini, P., Brenner, R.A., Bruckman, P., Brunet, J.-M., Bugge, L., Buschmann, P., Caccia, M., Calvi, M., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Castillo Gimenez, M.V., Cattai, A., Cavallo, F.R., Chapkin, M., Charpentier, Ph., Checchia, P., Chelkov, G.A., Chierici, R., Chliapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Cieslik, K., Collins, P., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Costa, M., Crawley, H.B., Crennell, D., Croix, J., Crosetti, G., Cuevas Maestro, J., Czellar, S., D'Hondt, J., Dalmau, J., Davenport, M., Da Silva, W., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Doroba, K., Dracos, M., Drees, J., Dris, M., Eigen, G., Ekelof, T., Ellert, M., Elsing, M., Engel, J.-P., Espirito Santo, M., Fanourakis, G., Fassouliotis, D., Feindt, M., Fernandez, J., Ferrer, A., Ferrer-Ribas, E., Ferro, F., Firestone, A., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B., Frodesen, A.G., Fruhwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, Ph., Gazis, E.N., Gele, D., Geralis, T., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Gonzalez Caballero, I., Gopal, G., Gorn, L., Gouz, Yu., Gracco, V., Grahl, J., Graziani, E., Grosdidier, G., Grzelak, K., Guy, J., Haag, C., Hahn, F., Hahn, S., Haider, S., Hallgren, A., Hamacher, K., Hansen, J., Harris, F.J., Haug, S., Hauler, F., Hedberg, V., Heising, S., Hernandez, J.J., Herquet, P., Herr, H., Hertz, O., Higon, E., Holmgren, S.-O., Holt, P.J., Hoorelbeke, S., Houlden, M., Hrubec, J., Hughes, G.J., Hultqvist, K., Jackson, J.N., Jacobsson, R., Jalocha, P., Jarlskog, Ch., Jarlskog, G., Jarry, P., Jean-Marie, B., Jeans, D., Johansson, E.K., Jonsson, P., Joram, C., Juillot, P., Jungermann, L., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E.C., Keranen, R., Kernel, G., Kersevan, B.P., Khokhlov, Yu., Khomenko, B.A., Khovanski, N.N., Kiiskinen, A., King, B., Kinvig, A., Kjaer, N.J., Klapp, O., Kluit, P., Kokkinias, P., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Krammer, M., Kriznic, E., Krumstein, Z., Kubinec, P., Kucharczyk, M., Kurowska, J., Lamsa, J.W., Laugier, J.-P., Leder, G., Ledroit, F., Leinonen, L., Leisos, A., Leitner, R., Lenzen, G., Lepeltier, V., Lesiak, T., Lethuillier, M., Libby, J., Liebig, W., Liko, D., Lipniacka, A., Lippi, I., Loken, J.G., Lopes, J.H., Lopez, J.M., Lopez-Fernandez, R., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Mahon, J.R., Maio, A., Malek, A., Maltezos, S., Malychev, V., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J.-C., Mariotti, C., Markou, A., Martinez-Rivero, C., Marti i Garcia, S., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, F., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Mc Pherson, G., Merle, E., Meroni, C., Meyer, W.T., Miagkov, A., Migliore, E., Mirabito, L., Mitaroff, W.A., Mjoernmark, U., Moa, T., Moch, M., Moenig, K., Monge, M.R., Montenegro, J., Moraes, D., Morettini, P., Morton, G., Mueller, U., Muenich, K., Mulders, M., Mundim, L.M., Murray, W.J., Muryn, B., Myatt, G., Myklebust, T., Nassiakou, M., Navarria, F.L., Nawrocki, K., Negri, P., Nemecek, S., Neufeld, N., Nicolaidou, R., Niezurawski, P., Nikolenko, M., Nomokonov, V., Nygren, A., Obraztsov, V., Olshevski, A.G., Onofre, A., Orava, R., Osterberg, K., Ouraou, A., Oyanguren, A., Paganoni, M., Paiano, S., Pain, R., Paiva, R., Palacios, J., Palka, H., Papadopoulou, Th.D., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Pavel, T., Pegoraro, M., Peralta, L., Perepelitsa, V., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H.T., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Poireau, V., Pol, M.E., Polok, G., Poropat, P., Pozdniakov, V., Privitera, P., Pukhaeva, N., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P.N., Read, A.L., Rebecchi, P., Redaelli, N.G., Regler, M., Rehn, J., Reid, D., Reinhardt, R., Renton, P.B., Resvanis, L.K., Richard, F., Ridky, J., Rinaudo, G., Ripp-Baudot, I., Romero, A., Ronchese, P., Rosenberg, E.I., Rosinsky, P., Roudeau, P., Rovelli, T., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salmi, L., Salt, J., Sampsonidis, D., Sannino, M., Savoy-Navarro, A., Schwanda, C., Schwemling, Ph., Schwering, B., Schwickerath, U., Scuri, F., Seager, P., Sedykh, Y., Segar, A.M., Sekulin, R., Sette, G., Shellard, R.C., Siebel, M., Simard, L., Simonetto, F., Sisakian, A.N., Smadja, G., Smirnov, N., Smirnova, O., Smith, G.R., Sokolov, A., Sopczak, A., Sosnowski, R., Spassov, T., Spiriti, E., Stanescu, C., Stanitzki, M., Stevenson, K., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Taffard, A., Tegenfeldt, F., Terranova, F., Timmermans, J., Tinti, N., Tkatchev, L.G., Tobin, M., Todorova, S., Tome, B., Tonazzo, A., Tortora, L., Tortosa, P., Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Turluer, M.-L., Tyapkin, I.A., Tyapkin, P., Tzamarias, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Van Dam, P., Van den Boeck, W., Van Eldik, J., Van Lysebetten, A., van Remortel, N., Van Vulpen, I., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verdier, P., Verlato, M., Vertogradov, L.S., Verzi, V., Vilanova, D., Vitale, L., Vlasov, E., Vodopyanov, A.S., Voulgaris, G., Vrba, V., Wahlen, H., Washbrook, A.J., Weiser, C., Wicke, D., Wickens, J.H., Wilkinson, G.R., Winter, M., Witek, M., Wolf, G., Yi, J., Yushchenko, O., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N.I., Zintchenko, A., Zoller, Ph., Zumerle, G., and Zupan, M.

Abstract

The cross sections for the production of single charged and neutral intermediate vector bosons were measured using integrated luminosities of 52 pb–1and 154 pb–1collected by the experiment at centre-of-mass energies of 182.6 GeV and 188.6 GeV, respectively. The cross sections for the reactions were determined in limited kinematic regions. The results found are in agreement with the Standard Model predictions for these channels.

Published
2001
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22. Feature-Related Acoustic Guidance of Unmanned Underwater Vehicles

Author

Caccia, M.

Abstract

This paper addresses the problem of the design and coordination of guidance and sonar-based motion estimation algorithms for unmanned underwater vehicles. In the framework of a two layered hierarchical architecture uncoupling the system's dynamics and kinematics, a guidance law for following an environmental feature has been designed with Lyapunov-based techniques and integrated with suitable acoustic-based estimators of the corresponding operational variables. A finite state machine combined with a suitable interface for event generation allows the coordinated execution of basic guidance and motion estimation tasks to carry out more complex functions. Experimental results of a prototype UUV executing the coordinated mission of following the perimeter of the trial pool are reported and discussed.

Published
2001
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23. Execution Control of Robotic Tasks for UUVs

Author

Coletta, P., Bono, R., Bruzzone, G., Caccia, M., and Veruggio, G.

Abstract

The problem of designing an interface between the continuous-state and the discrete-state domains of intelligent control architectures is addressed in this paper, focusing on the case of a hierarchical navigation, guidance and control architecture for unmanned underwater vehicles. The proposed interface represents the underlying continuous-state execution level as a DES using a Petri net formalism. The correct behavior of the execution level is ensured, checking that no forbidden state is reached and that the proper task activation and deactivation order is respected. Methodologies for the off-line generation of the Petri net representation of the Execution level and realtime automatic system reconfiguration are presented.

Published
2001
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26. Bottom-Following for Remotely Operated Vehicles

Author

Caccia, M., Bono, R., Bruzzone, G., and Veruggio, G.

Abstract

This paper addresses the problem of designing high precision bottom followers for remotely operated vehicles. In the framework of hierarchical control architectures able to uncouple the robot’s kinematics (guidance) and dynamics (velocity control), the task of bottom-following is accomplished by suitable guidance task functions, which enable the system to handle unmodelled, i.e. not measured or estimated, kinematics interactions between the robot and the operating environment. In order to increase the bottom followers’ reliability, the paper discusses possible techniques for modeling and handling the environmental and measurement uncertainty in the estimate of the local interactions between the vehicle and the operating environment, i.e. altitude and bottom slope. In particular, according to at-sea operational experience, the problem of managing dropouts due to erroneous tracking of multi-path echoes by the ROV altimeters) is addressed. Results of a large set of pool trials carried out with the Romeo ROV are reported and discussed.

Published
2000
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27. Fault Detection Through Dynamics Monitoring for Unmanned Underwater Vehicles

Author

Alessandri, A., Bruzzone, G., Caccia, M., Coletta, P., and Veruggio, G.

Abstract

This paper addresses the problem of fault detection for unmanned underwater vehicles (UUVs). The design of a fault diagnosis system has been considered for Romeo, an overactuated prototype UUV, built and developed at the Naval Automation Institute, Genoa, Italy. Model-based residual generation has been addressed using the dynamic models identified to describe the motion of this vehicle. These models are affected by uncertainties, therefore robustness is of primary importance. Sliding-mode observers have been used as robust residual generators. The results obtained with real data of artificial faults using the extended Kalman filter and the sliding-mode observer are reported.

Published
2000
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32. Search for pair-produced neutralinos in events with photons and missing energy from e+e- collisions at <img src="/fulltext-image.asp?format=htmlnonpaginated&src=AHY3BA2UT6FQBDDN_html\10052_2009_Article_9801044_TeX2GIFIE1.gif" border="0" alt=" $$\sqrt s = 130 - 183$$ " /> GeV

Author

Abreu, P., Adye, T., Adzic, P., Ajinenko, I., Alekseev, G., Alemany, R., Allport, P., Almehed, S., Amaldi, U., Amato, S., Anassontzis, E., Andersson, P., Andreazza, A., Andringa, S., Antilogus, P., Apel, W., Arnoud, Y., Åsman, B., Augustin, J., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Barbier, R., Bardin, D., Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K., Begalli, M., Beilliere, P., Belokopytov, Yu., Benvenuti, A., Berat, C., Berggren, M., Bertini, D., Bertrand, D., Besancon, M., Bianchi, F., Bigi, M., Bilenky, M., Bizouard, M., Bloch, D., Blom, H., Bonesini, M., Bonivento, W., Boonekamp, M., Booth, P., Borgland, A., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T., Boyko, I., Bozovic, I., Bozzo, M., Branchini, P., Brenke, T., Brenner, R., Bruckman, P., Brunet, J., Bugge, L., Buran, T., Burgsmueller, T., Buschmann, P., Cabrera, S., Caccia, M., Calvi, M., Camacho Rozas, A., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Castillo Gimenez, M., Cattai, A., Cavallo, F., Cerruti, Ch., Chabaud, V., Charpentier, Ph., Chaussard, L., Checchia, P., Chelkov, G., Chierici, R., Chliapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Collins, P., Colomer, M., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Cowell, J., Crawley, H., Crennell, D., Crosetti, G., Cuevas Maestro, J., Czellar, S., Damgaard, G., Davenport, M., Da Silva, W., Deghorain, A., Delia Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boer, W., De Brabandere, S., De Clercq, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Di Diodato, A., Dolbeau, J., Doroba, K., Dracos, M., Drees, J., Dris, M., Duperrin, A., Durand, J., Ehret, R., Eigen, G., Ekelof, T., Ekspong, G., Ellert, M., Elsing, M., Engel, J., Erzen, B., Espirito Santo, M., Falk, E., Fanourakis, G., Fassouliotis, D., Fayot, J., Feindt, M., Ferrari, P., Ferrer, A., Ferrer-Ribas, E., Fichet, S., Firestone, A., Fischer, P., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B., Frodesen, A., Fruhwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, Ph., Gazis, E., Gele, D., Gerber, J., Gerdyukov, L., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Goncalves, P., Gonzalez Caballero, I., Gopal, G., Gorn, L., Gorski, M., Gouz, Yu., Gracco, V., Grahl, J., Graziani, E., Green, C., Gris, P., Grzelak, K., Gunther, M., Guy, J., Hahn, F., Hahn, S., Haider, S., Hallgren, A., Hamacher, K., Harris, F., Hedberg, V., Heising, S., Hernandez, J., Herquet, P., Herr, H., Hessing, T., Heuser, J., Higon, E., Holmgren, S., Holt, P., Holthuizen, D., Hoorelbeke, S., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Jackson, J., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, Ch., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E., Jonsson, P., Joram, C., Juillot, P., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E., Keranen, R., Khomenko, B., Khovanski, N., Kiiskinen, A., King, B., Kjaer, N., Klapp, O., Klein, H., Kluit, P., Knoblauch, D., Kokkinias, P., Koratzinos, M., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Krammer, M., Kreuter, C., Kriznic, E., Krstic, J., Krumstein, Z., Kubinec, P., Kucewicz, W., Kurvinen, K., Lamsa, J., Lane, D., Langefeld, P., Lapin, V., Laugier, J., Lauhakangas, R., Leder, G., Ledroit, F., Lefebure, V., Leinonen, L., Leisos, A., Leitner, R., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Lethuillier, M., Libby, J., Liko, D., Lipniacka, A., Lippi, I., Loerstad, B., Loken, J., Lopes, J., Lopez, J., Lopez-Fernandez, R., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Mahon, J., Maio, A., Malek, A., Malmgren, T., Malychev, V., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J., Mariotti, C., Markou, A., Martinez-Rivero, C., Martinez-Vidal, F., Marti i Garcia, S., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Matthiae, G., Mazik, J., Mazzucato, F., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Mc Pherson, G., Meroni, C., Meyer, W., Miagkov, A., Migliore, E., Mirabito, L., Mitaroff, W., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M., Moreau, X., Morettini, P., Morton, G., Mueller, U., Muenich, K., Mulders, M., Mulet-Marquis, C., Muresan, R., Murray, W., Muryn, B., Myatt, G., Myklebust, T., Naraghi, F., Navarria, F., Navas, S., Nawrocki, K., Negri, P., Neufeld, N., Neumeister, N., Nicolaidou, R., Nielsen, B., Nikolaenko, V., Nikolenko, M., Nomokonov, V., Normand, A., Nygren, A., Obraztsov, V., Olshevski, A., Onofre, A., Orava, R., Orazi, G., Osterberg, K., Ouraou, A., Paganoni, M., Paiano, S., Pain, R., Paiva, R., Palacios, J., Palka, H., Papadopoulou, Th., Papageorgiou, K., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Pegoraro, M., Peralta, L., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H., Piana, G., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Pol, M., Polok, G., Poropat, P., Pozdniakov, V., Privitera, P., Pukhaeva, N., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rakoczy, D., Ratoff, P., Read, A., Rebecchi, P., Redaelli, N., Regler, M., Reid, D., Reinhardt, R., Renton, P., Resvanis, L., Richard, F., Ridky, J., Rinaudo, G., Rohne, O., Romero, A., Ronchese, P., Rosenberg, E., Rosinsky, P., Roudeau, P., Rovelli, T., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sampsonidis, D., Sannino, M., Schneider, H., Schwemling, Ph., Schwickerath, U., Schyns, M., Scuri, F., Seager, P., Sedykh, Y., Segar, A., Sekulin, R., Shellard, R., Sheridan, A., Siebel, M., Silvestre, R., Simard, L., Simonetto, F., Sisakian, A., Skaali, T., Smadja, G., Smirnova, O., Smith, G., Sokolov, A., Sopczak, A., Sosnowski, R., Spassov, T., Spiriti, E., Sponholz, P., Squarcia, S., Stampfer, D., Stanescu, C., Stanic, S., Stapnes, S., Stevenson, K., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Tegenfeldt, F., Terranova, F., Thomas, J., Tilquin, A., Timmermans, J., Tkatchev, L., Todorov, T., Todorova, S., Toet, D., Tomaradze, A., Tome, B., Tonazzo, A., Tortora, L., Transtromer, G., Treille, D., Tristram, G., Troncon, C., Tsirou, A., Turluer, M., Tyapkin, I., Tzamarias, S., Ueberschaer, B., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Van Apeldoorn, G., Van Dam, P., Van Doninck, W., Van Eldik, J., Van Lysebetten, A., Van Vulpen, I., Vassilopoulos, N., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L., Verzi, V., Vilanova, D., Vitale, L., Vlasov, E., Vodopyanov, A., Voulgaris, G., Vrba, V., Wahlen, H., Walck, C., Weiser, C., Wicke, D., Wickens, J., Wilkinson, G., Winter, M., Witek, M., Wolf, G., Yi, J., Yushchenko, O., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N., Zucchelli, G., and Zumerle, G.

Abstract

Abstract: The events with two photons and missing (transverse) energy collected by the DELPHI detector at centre-of-mass energies between 130 GeV and 183 GeV have been studied to search for processes of the type e+e- → YY with the subsequent decay Y → X7, where X is an undetectable neutral particle. Reactions of this kind are expected in supersymmetric models, where the Y particle can be either the lightest neutralino, decaying to a photon and a gravitino, or the next-to-lightest neutralino, decaying to a photon and the lightest neutralino. To study the case of long-lived Y particles, a search for single-photon events with the reconstructed photon axis pointing far from the beam interaction region has also been performed. No evidence for a deviation from Standard Model expectations has been observed in the data and upper limits have been derived on the signal cross-section as a function of the the X and Y masses and of the Y mean decay path.

Published
1999
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33. Search for scalar fermions and long-lived scalar leptons at centre-of-mass energies of 130 GeV to 172 GeV

Author

Crawley, H., Firestone, A., Grahl, J., Lamsa, J., Lane, D., Kay, R., Meyer, W., Rosenberg, E., Gorn, L., Deghorain, A., De Brabandere, S., De Clercq, C., Bertrand, D., Herquet, P., Hoorelbeke, S., Huet, K., Lefebure, V., Tomaradze, A., Vander Velde, C., Van Lysebetten, A., Verbeure, F., Wickens, J., Contri, R., Anassontzis, E., Voulgaris, G., Kourkoumelis, C., Resvanis, L., Borgland, A., Stugu, B., Frodesen, A., Eigen, G., Benvenuti, A., Valenti, G., Paiano, S., Perrotta, A., Rovelli, T., Begalli, M., Pol, M., Mahon, J., Shellard, R., Chochula, P., Kubinec, P., Rosinsky, P., Janik, R., Beilliere, P., Dolbeau, J., Tristram, G., Brunet, J-M., Belokopytov, Yu., Davenport, M., Demaria, N., De Angelis, A., Camporesi, T., Carena, F., Cattai, A., Chabaud, V., Charpentier, Ph., Collins, P., Dijkstra, H., Augustinus, A., Baillon, P., Andreazza, A., Elsing, M., Fischer, P., Foeth, H., Gaspar, C., Gavillet, Ph., Hahn, F., Haider, S., Herr, H., Jacobsson, R., Jalocha, P., Joram, C., Klein, H., Koratzinos, M., Kreuter, C., Liko, D., Marin, J., Mariotti, C., Nulty, R., Moenig, K., Neufeld, N., Pape, L., Rebecchi, P., Reid, D., Treille, D., Tsirou, A., Ullaland, O., Barker, G., Wilkinson, G., Wolf, G., Amaldi, U., Bloch, D., Dracos, M., Cerruti, Ch., Engel, J-P., Gele, D., Gerber, J-P., Juillot, P., Nikolaenko, V., Orazi, G., Strub, R., Todorov, T., Todorova, S., Winter, M., Bozovic, I., Adzic, P., Fanourakis, G., Fassouliotis, D., Karafasoulis, K., Kokkinias, P., Krstic, J., Leisos, A., Loukas, D., Markou, A., Mastroyiannopoulos, N., Papageorgiou, K., Sampsonidis, D., Tzamarias, S., Zevgolatakos, E., Lokajicek, M., Ridky, J., Vrba, V., Caso, C., Crosetti, G., Fontanelli, F., Gracco, V., Monge, M., Morettini, P., Parodi, F., Petrolini, A., Piana, G., Sannino, M., Squarcia, S., Ledroit, F., Lopez-Fernandez, R., Mulet-Marquis, C., Naraghi, F., Nicolaidou, R., Sajot, G., Arnoud, Y., Berat, C., Czellar, S., Kiiskinen, A., Kurvinen, K., Lauhakangas, R., Nomokonov, V., Battaglia, M., Orava, R., Osterberg, K., Saarikko, H., Bilenky, M., Chelkov, G., Boyko, I., Khomenko, B., Khovanski, N., Kouznetsov, O., Krumstein, Z., Malychev, V., Zimin, N., Nikolenko, M., Olshevski, A., Pozdniakov, V., Pukhaeva, N., Sadovsky, A., Sedykh, Y., Sisakian, A., Tkatchev, L., Tyapkin, I., Vertogradov, L., Vodopyanov, A., Alekseev, G., Zimin, N., Bardin, D., De Boer, W., Ehret, R., Feindt, M., Heising, S., Keranen, R., Knoblauch, D., Schneider, H., Schwickerath, U., Sopczak, A., Weiser, C., Ape, W-D., Kucewicz, W., Lesiak, T., Muryn, B., Palka, H., Polok, G., Witek, M., Zalewska, A., Bruckman, P., Bizouard, M-A., Borisov, G., Bouquet, B., Bourdarios, C., Ferrer-Ribas, E., Fulda-Quenzer, F., Gamblin, S., Jean-Marie, B., Lepeltier, V., Martinez-Rivero, C., Richard, F., Roudeau, P., Cosme, G., Stocchi, A., Bambade, P., Ratoff, P., Seager, P., Abreu, P., Andringa, S., Barao, F., Espirito Santo, M., Goncalves, P., Maio, A., Onofre, A., Paiva, R., Peralta, L., Pimenta, M., Spassov, T., Tome, B., Booth, P., Bowcock, T., Allport, P., Carroll, L., Galloni, A., Green, C., Houlden, M., Jackson, J., King, B., Marti i Garcia, S., Cubbin, M., Pherson, G., Normand, A., Parzefall, U., Sheridan, A., Cowell, J., Da Silva, W., Baubillier, M., Fayot, J., Fichet, S., Kapusta, F., Moreau, X., Pain, R., Schwemling, Ph., Falk, E., Hedberg, V., Jarlskog, Ch., Jarlskog, G., Jonsson, P., Loerstad, B., Mjoernmark, U., Muresan, R., Nygren, A., Smirnova, O., Transtromer, G., Almehed, S., Antilogus, P., Barbier, R., Berggren, M., Bertini, D., Augustin, J., Durand, J., Duperrin, A., Chaussard, L., Chorowicz, V., Ghodbane, N., Katsanevas, S., Mirabito, L., Smadja, G., Delpierre, P., Tilquin, A., Ferrari, P., Matteuzzi, C., Meroni, C., Negri, P., Paganoni, M., Piotto, E., Pullia, A., Ragazzi, S., Redaelli, N., Tabarelli, T., Terranova, F., Tonazzo, A., Troncon, C., Vegni, G., Caccia, M., Calvi, M., Bonesini, M., Bonivento, W., Moeller, R., Nielsen, B., Damgaard, G., Mazik, J., Leitner, R., Chudoba, J., Boudinov, E., Blom, H., Holthuizen, D., Kjaer, N., Kluit, P., Mulders, M., Timmermans, J., Toet, D., Van Apeldoorn, G., Van Dam, P., Van Eldik, J., Van Vulpen, I., Fokitis, E., Gazis, E., Katsoufis, E., Papadopoulou, Th., Dris, M., Rahmani, H., Myklebust, T., Read, A., Rohne, O., Skaali, T., Stapnes, S., Bugge, L., Buran, T., Cuevas Maestro, J., Harris, F., Hessing, T., Holt, P., Libby, J., Loken, J., Lyons, L., Morton, G., Myatt, G., Palacios, J., Parkes, C., Radojicic, D., Renton, P., Segar, A., Stevenson, K., Thomas, J., Vassilopoulos, N., Harris, F., Hessing, T., Holt, P., Libby, J., Loken, J., Lyons, L., Morton, G., Myatt, G., Palacios, J., Parkes, C., Radojicic, D., Renton, P., Segar, A., Stevenson, K., Thomas, J., Vassilopoulos, N., Checchia, P., Zumerle, G., De Min, A., Gasparini, U., Lippi, I., Margoni, M., Mazzucato, F., Mazzucato, M., Pegoraro, M., Ronchese, P., Simonetto, F., Ventura, L., Verlato, M., Franek, B., Gopal, G., Guy, J., Murray, W., Phillips, H., Sekulin, R., Smith, G., Venus, W., Adye, T., Crennell, D., Di Ciaccio, L., Di Diodato, A., Matthiae, G., Privitera, P., Verzi, V., Canale, V., Baroncelli, A., Branchini, P., Graziani, E., Passeri, A., Spiriti, E., Stanescu, C., Tortora, L., Cossutti, F., Boonekamp, M., Besancon, M., Gris, P., Jarry, P., Laugier, J-P., Lethuillier, M., Lutz, P., Ouraou, A., Pierre, F., Ruhlmann-Kleider, V., Sacquin, Y., Silvestre, R., Simard, L., Turluer, M-L., Vilanova, D., Camacho Rozas, A., Garcia, J., Gonzalez Caballero, I., Lopez, J., Marco, J., Marco, R., Matorras, F., Ruiz, A., Bosio, C., Ajinenko, I., Chliapnikov, P., Gouz, Yu., Konopliannikov, A., Kostioukhine, V., Lapin, V., Miagkov, A., Obraztsov, V., Smirnov, N., Tchikilev, O., Uvarov, V., Vlasov, E., Yushchenko, O., Erzen, B., Golob, B., Kriznic, E., Podobnik, T., Stanic, S., Zavrtanik, D., Ekspong, G., Holmgren, S-O., Hultqvist, K., Johansson, E., Leinonen, L., Lipniacka, A., Malmgren, T., Moa, T., Walck, C., Zucchelli, G., Åsman, B., Andersson, P., Bianchi, F., Bigi, M., Chierici, R., Gamba, D., Migliore, E., Rinaudo, G., Romero, A., Barbiellini, G., Delia Ricca, G., De Lotto, B., Petridou, C., Poropat, P., Scuri, F., Vallazza, E., Vitale, L., De Paula, L., Gandelman, M., Gaspar, M., Lopes, J., Marechal, B., Amato, S., Botner, O., Brenner, R., Ekelof, T., Ellert, M., Günther, M., Hallgren, A., Tegenfeldt, F., Cabrera, S., Castillo Gimenez, M., Ferrer, A., Fuster, J., Garcia, C., Gil, I., Hernandez, J., Higon, E., Martinez-Vidal, F., Navas, S., Salt, J., Colomer, M., Cortina, E., Alemany, R., Adam, W., Fruhwirth, R., Hrubec, J., Krammer, M., Leder, G., MacNaughton, J., Mandl, F., Neumeister, N., Pernicka, M., Rakoczy, D., Regler, M., Stampfer, D., Strauss, J., Doroba, K., Gokieli, R., Gorski, M., Grzelak, K., Nawrocki, K., Sosnowski, R., Szczekowski, M., Szeptycka, M., Zalewski, P., Becks, K-H., Brenke, T., Burgsmueller, T., Buschmann, P., Drees, J., Flagmeyer, U., Glege, F., Hahn, S., Hamacher, K., Heuser, J., Klapp, O., Langefeld, P., Lenzen, G., Malek, A., Mueller, U., Muenich, K., Passon, O., Reinhardt, R., Schyns, M., Siebel, M., Sponholz, P., Ueberschaer, B., Wahlen, H., and Wicke, D.

Abstract

Abstract: Data taken by DELPHI during the 1995 and 1996 LEP runs have been used to search for the supersymmetric partners of electron, muon and tau leptons and of top and bottom quarks. The observations are in agreement with standard model predictions. Limits are set on sfermion masses. Searches for long lived scalar leptons from low scale supersymmetry breaking models exclude stau masses below 55 GeV/c2 at the 95% confidence level, irrespective of the gravitino mass.

Published
1999
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34. Model-Based Heave Motion Estimation for Variable-Configuration Unmanned Underwater Vehicles

Author

Caccia, M. and Veruggio, G.

Abstract

The problem of designing and implementing filters able to satisfy high precision requirements in the estimate of the depth of variable configuration unmanned underwater vehicles for marine science applications is tackled in this paper. Two classes of modelbased filters are considered. A conventional extended Kalman filter is compared to a complementary filter able to complement the information at low frequency supplied by the depth-meter with the information at high frequency given by the dynamic model of the system. Both the filters have been tested on real data recorded during at sea trials of Romeo, the variable configuration ROV developed by CNR-IAN. An extended record and discussion of experimental results is reported.

Published
1999
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35. Energy dependence of inclusive spectra in e+e−annihilation

Author

Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., Alekseev, G.D., Alemany, R., Allmendinger, T., Allport, P.P., Almehed, S., Amaldi, U., Amapane, N., Amato, S., Anassontzis, E.G., Andersson, P., Andreazza, A., Andringa, S., Antilogus, P., Apel, W-D., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Barbier, R., Bardin, D.Y., Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K-H., Begalli, M., Behrmann, A., Beilliere, P., Belokopytov, Yu., Belous, K., Benekos, N.C., Benvenuti, A.C., Berat, C., Berggren, M., Bertini, D., Bertrand, D., Besancon, M., Bigi, M., Bilenky, M.S., Bizouard, M-A., Bloch, D., Blom, H.M., Bonesini, M., Bonivento, W., Boonekamp, M., Booth, P.S.L., Borgland, A.W., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T.J.V., Boyko, I., Bozovic, I., Bozzo, M., Branchini, P., Brenke, T., Brenner, R.A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Burgsmueller, T., Buschbeck, B., Buschmann, P., Cabrera, S., Caccia, M., Calvi, M., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Castillo Gimenez, M.V., Cattai, A., Cavallo, F.R., Chabaud, V., Chapkin, M., Charpentier, Ph., Chaussard, L., Checchia, P., Chelkov, G.A., Chierici, R., Chliapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Cieslik, K., Collins, P., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Cowell, J-H., Crawley, H.B., Crennell, D., Crepe, S., Crosetti, G., Cuevas Maestro, J., Czellar, S., Davenport, M., Da Silva, W., Deghorain, A., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Dolbeau, J., Doroba, K., Dracos, M., Drees, J., Dris, M., Duperrin, A., Durand, J-D., Eigen, G., Ekelof, T., Ekspong, G., Ellert, M., Elsing, M., Engel, J-P., Erzen, B., Espirito Santo, M., Falk, E., Fanourakis, G., Fassouliotis, D., Fayot, J., Feindt, M., Fenyuk, A., Ferrari, P., Ferrer, A., Ferrer-Ribas, E., Ferro, F., Fichet, S., Firestone, A., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B., Frodesen, A.G., Fruhwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, Ph., Gazis, E.N., Gele, D., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Gonzalez Caballero, I., Gopal, G., Gorn, L., Gorski, M., Gouz, Yu., Gracco, V., Grahl, J., Graziani, E., Green, C., Grimm, H-J., Gris, P., Grosdidier, G., Grzelak, K., Gunther, M., Guy, J., Hahn, F., Hahn, S., Haider, S., Hallgren, A., Hamacher, K., Hansen, J., Harris, F.J., Hedberg, V., Heising, S., Hernandez, J.J., Herquet, P., Herr, H., Hessing, T.L., Heuser, J.-M., Higon, E., Holmgren, S-O., Holt, P.J., Hoorelbeke, S., Houlden, M., Hrubec, J., Huet, K., Hughes, G.J., Hultqvist, K., Jackson, J.N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, Ch., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E.K., Jonsson, P., Joram, C., Juillot, P., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E.C., Keranen, R., Kersevan, B.P., Khomenko, B.A., Khovanski, N.N., Kiiskinen, A., King, B., Kinvig, A., Kjaer, N.J., Klapp, O., Klein, H., Kluit, P., Kokkinias, P., Koratzinos, M., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Krammer, M., Kriznic, E., Krstic, P., Krumstein, Z., Kubinec, P., Kurowska, J., Kurvinen, K., Lamsa, J.W., Lane, D.W., Langefeld, P., Laugier, J-P., Lauhakangas, R., Ledroit, F., Lefebure, V., Leinonen, L., Leisos, A., Leitner, R., Lenzen, G., Lepeltier, V., Lesiak, T., Lethuillier, M., Libby, J., Liko, D., Lipniacka, A., Lippi, I., Loerstad, B., Loken, J.G., Lopes, J.H., Lopez, J.M., Lopez-Fernandez, R., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Mahon, J.R., Maio, A., Malek, A., Malmgren, T.G.M., Maltezos, S., Malychev, V., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Martinez-Rivero, C., Martinez-Vidal, F., Marti i Garcia, S., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, F., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Mc Pherson, G., Meroni, C., Meyer, W.T., Migliore, E., Mirabito, L., Mitaroff, W.A., Mjoernmark, U., Moa, T., Moch, M., Moeller, R., Moenig, K., Monge, M.R., Moreau, X., Morettini, P., Morton, G., Mueller, U., Muenich, K., Mulders, M., Mulet-Marquis, C., Muresan, R., Murray, W.J., Muryn, B., Myatt, G., Myklebust, T., Naraghi, F., Nassiakou, M., Navarria, F.L., Navas, S., Nawrocki, K., Negri, P., Nemecek, S., Neufeld, N., Neumeister, N., Nicolaidou, R., Nielsen, B.S., Nikolenko, M., Nomokonov, V., Normand, A., Nygren, A., Obraztsov, V., Olshevski, A.G., Onofre, A., Orava, R., Orazi, G., Osterberg, K., Ouraou, A., Paganoni, M., Paiano, S., Pain, R., Paiva, R., Palacios, J., Palka, H., Papadopoulou, Th.D., Papageorgiou, K., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Pegoraro, M., Peralta, L., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H.T., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Pol, M.E., Polok, G., Poropat, P., Pozdniakov, V., Privitera, P., Pukhaeva, N., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P.N., Read, A.L., Rebecchi, P., Redaelli, N.G., Regler, M., Reid, D., Reinhardt, R., Renton, P.B., Resvanis, L.K., Richard, F., Ridky, J., Rinaudo, G., Rohne, O., Romero, A., Ronchese, P., Rosenberg, E.I., Rosinsky, P., Roudeau, P., Rovelli, T., Royon, Ch., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sampsonidis, D., Sannino, M., Schneider, H., Schwemling, Ph., Schwering, B., Schwickerath, U., Schyns, M.A.E., Scuri, F., Seager, P., Sedykh, Y., Segar, A.M., Sekulin, R., Shellard, R.C., Sheridan, A., Siebel, M., Simard, L., Simonetto, F., Sisakian, A.N., Smadja, G., Smirnov, N., Smirnova, O., Smith, G.R., Sopczak, A., Sosnowski, R., Spassov, T., Spiriti, E., Sponholz, P., Squarcia, S., Stanescu, C., Stanic, S., Stevenson, K., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Tegenfeldt, F., Terranova, F., Thomas, J., Timmermans, J., Tinti, N., Tkatchev, L.G., Todorova, S., Tomaradze, A., Tome, B., Tonazzo, A., Tortora, L., Transtromer, G., Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Tsirou, A., Turluer, M-L., Tyapkin, I.A., Tzamarias, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Van Apeldoorn, G.W., Van Dam, P., Van Eldik, J., Van Lysebetten, A., Van Remortel, N., Van Vulpen, I., Vassilopoulos, N., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L.S., Verzi, V., Vilanova, D., Vitale, L., Vlasov, E., Vodopyanov, A.S., Vollmer, C., Voulgaris, G., Vrba, V., Wahlen, H., Walck, C., Weiser, C., Wicke, D., Wickens, J.H., Wilkinson, G.R., Winter, M., Witek, M., Wolf, G., Yi, J., Yushchenko, O., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N.I., Zucchelli, G.C., and Zumerle, G.

Abstract

Inclusive charged hadron distributions as obtained from the DELPHI measurements at 130, 136, 161, 172 and 183 GeV are presented as a function of the variables rapidity, ξp, pand transversal momenta. Data are compared with event generators and with MLLA calculations, in order to examine the hypothesis of local parton hadron duality. The differential momentum spectra show an indication for coherence effects in the production of soft particles. The relation between the energy dependence of the charged multiplicity and the rapidity distribution is examined.

Published
1999
Full Text
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36. A search for invisible Higgs bosons produced in e+e−interactions at LEP 2 energies

Author

Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., Alekseev, G.D., Alemany, R., Allmendinger, T., Allport, P.P., Almehed, S., Amaldi, U., Amapane, N., Amato, S., Anassontzis, E.G., Andersson, P., Andreazza, A., Andringa, S., Antilogus, P., Apel, W-D., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Barbier, R., Bardin, D.Y., Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K-H., Begalli, M., Behrmann, A., Beilliere, P., Belokopytov, Yu., Belous, K., Benekos, N.C., Benvenuti, A.C., Berat, C., Berggren, M., Bertini, D., Bertrand, D., Besancon, M., Bigi, M., Bilenky, M.S., Bizouard, M-A., Bloch, D., Blom, H.M., Bonesini, M., Bonivento, W., Boonekamp, M., Booth, P.S.L., Borgland, A.W., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T.J.V., Boyko, I., Bozovic, I., Bozzo, M., Branchini, P., Brenke, T., Brenner, R.A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Burgsmueller, T., Buschbeck, B., Buschmann, P., Cabrera, S., Caccia, M., Calvi, M., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Castillo Gimenez, M.V., Cattai, A., Cavallo, F.R., Chabaud, V., Chapkin, M., Charpentier, Ph., Chaussard, L., Checchia, P., Chelkov, G.A., Chierici, R., Chliapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Cieslik, K., Collins, P., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Cowell, J-H., Crawley, H.B., Crennell, D., Crepe, S., Crosetti, G., Cuevas Maestro, J., Czellar, S., Davenport, M., Da Silva, W., Deghorain, A., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Dolbeau, J., Doroba, K., Dracos, M., Drees, J., Dris, M., Duperrin, A., Durand, J-D., Eigen, G., Ekelof, T., Ekspong, G., Ellert, M., Elsing, M., Engel, J-P., Erzen, B., Espirito Santo, M., Falk, E., Fanourakis, G., Fassouliotis, D., Fayot, J., Feindt, M., Fenyuk, A., Ferrari, P., Ferrer, A., Ferrer-Ribas, E., Ferro, F., Fichet, S., Firestone, A., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B., Frodesen, A.G., Fruhwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, Ph., Gazis, E.N., Gele, D., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Gonzalez Caballero, I., Gopal, G., Gorn, L., Gorski, M., Gouz, Yu., Gracco, V., Grahl, J., Graziani, E., Green, C., Grimm, H-J., Gris, P., Grosdidier, G., Grzelak, K., Gunther, M., Guy, J., Hahn, F., Hahn, S., Haider, S., Hallgren, A., Hamacher, K., Hansen, J., Harris, F.J., Hedberg, V., Heising, S., Hernandez, J.J., Herquet, P., Herr, H., Hessing, T.L., Heuser, J.-M., Higon, E., Holmgren, S-O., Holt, P.J., Hoorelbeke, S., Houlden, M., Hrubec, J., Huet, K., Hughes, G.J., Hultqvist, K., Jackson, J.N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, Ch., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E.K., Jonsson, P., Joram, C., Juillot, P., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E.C., Keranen, R., Kersevan, B.P., Khomenko, B.A., Khovanski, N.N., Kiiskinen, A., King, B., Kinvig, A., Kjaer, N.J., Klapp, O., Klein, H., Kluit, P., Kokkinias, P., Koratzinos, M., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Krammer, M., Kriznic, E., Krstic, J., Krumstein, Z., Kubinec, P., Kurowska, J., Kurvinen, K., Lamsa, J.W., Lane, D.W., Langefeld, P., Lapin, V., Laugier, J-P., Lauhakangas, R., Leder, G., Ledroit, F., Lefebure, V., Leinonen, L., Leisos, A., Leitner, R., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Lethuillier, M., Libby, J., Liko, D., Lipniacka, A., Lippi, I., Loerstad, B., Loken, J.G., Lopes, J.H., Lopez, J.M., Lopez-Fernandez, R., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Mahon, J.R., Maio, A., Malek, A., Malmgren, T.G.M., Maltezos, S., Malychev, V., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Martinez-Rivero, C., Martinez-Vidal, F., Marti i Garcia, S., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, F., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Mc Pherson, G., Meroni, C., Meyer, W.T., Migliore, E., Mirabito, L., Mitaroff, W.A., Mjoernmark, U., Moa, T., Moch, M., Moeller, R., Moenig, K., Monge, M.R., Moreau, X., Morettini, P., Morton, G., Mueller, U., Muenich, K., Mulders, M., Mulet-Marquis, C., Muresan, R., Murray, W.J., Muryn, B., Myatt, G., Myklebust, T., Naraghi, F., Nassiakou, M., Navarria, F.L., Navas, S., Nawrocki, K., Negri, P., Nemecek, S., Neufeld, N., Neumeister, N., Nicolaidou, R., Nielsen, B.S., Nikolenko, M., Nomokonov, V., Normand, A., Nygren, A., Obraztsov, V., Olshevski, A.G., Onofre, A., Orava, R., Orazi, G., Osterberg, K., Ouraou, A., Paganoni, M., Paiano, S., Pain, R., Paiva, R., Palacios, J., Palka, H., Papadopoulou, Th.D., Papageorgiou, K., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Pegoraro, M., Peralta, L., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H.T., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Pol, M.E., Polok, G., Poropat, P., Pozdniakov, V., Privitera, P., Pukhaeva, N., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P.N., Read, A.L., Rebecchi, P., Redaelli, N.G., Reid, D., Reinhardt, R., Renton, P.B., Resvanis, L.K., Richard, F., Ridky, J., Rinaudo, G., Rohne, O., Romero, A., Ronchese, P., Rosenberg, E.I., Rosinsky, P., Roudeau, P., Rovelli, T., Royon, Ch., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sampsonidis, D., Sannino, M., Schneider, H., Schwemling, Ph., Schwering, B., Schwickerath, U., Schyns, M.A.E., Scuri, F., Seager, P., Sedykh, Y., Segar, A.M., Sekulin, R., Shellard, R.C., Sheridan, A., Siebel, M., Simard, L., Simonetto, F., Sisakian, A.N., Smadja, G., Smirnov, N., Smirnova, O., Smith, G.R., Sopczak, A., Sosnowski, R., Spassov, T., Spiriti, E., Sponholz, P., Squarcia, S., Stanescu, C., Stanic, S., Stevenson, K., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tegenfeldt, F., Terranova, F., Thomas, J., Timmermans, J., Tinti, N., Tkatchev, L.G., Todorova, S., Tomaradze, A., Tome, B., Tonazzo, A., Tortora, L., Transtromer, G., Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Tsirou, A., Turluer, M-L., Tyapkin, I.A., Tzamarias, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Vander Velde, C., Van Apeldoorn, G.W., Van Dam, P., Van Doninck, W.K., Van Eldik, J., Van Lysebetten, A., Van Remortel, N., Van Vulpen, I., Vassilopoulos, N., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L.S., Verzi, V., Vilanova, D., Vitale, L., Vlasov, E., Vodopyanov, A.S., Vollmer, C., Voulgaris, G., Vrba, V., Wahlen, H., Walck, C., Weiser, C., Wicke, D., Wickens, J.H., Wilkinson, G.R., Winter, M., Witek, M., Wolf, G., Yi, J., Yushchenko, O., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N.I., Zucchelli, G.C., and Zumerle, G.

Abstract

Searches for HZ production with the Higgs boson decaying into an invisible final state have been performed with the data collected by the DELPHI experiment up to the centre-of-mass energy of 183 GeV. The hadronic and muon pair final states of the Z boson were analysed. From the absence of signal, upper limits on the cross-section and the corresponding Higgs boson mass limits were set at 95% confidence level. The results are interpreted as excluded parameter regions in the framework of the minimal supersymmetric standard model and in the simplest Majoron model with one Higgs doublet and one Higgs singlet field.

Published
1999
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37. Measurements of the trilinear gauge boson couplings WWV(V≡γ,Z) in e+e−collisions at 183 GeV

Author

Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Albrecht, Z., Alderweireld, T., Alekseev, G.D., Alemany, R., Allmendinger, T., Allport, P.P., Almehed, S., Amaldi, U., Amapane, N., Amato, S., Anassontzis, E.G., Andersson, P., Andreazza, A., Andringa, S., Antilogus, P., Apel, W-D., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Barbier, R., Bardin, D.Y., Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K-H., Begalli, M., Behrmann, A., Beilliere, P., Belokopytov, Yu., Benekos, N.C., Benvenuti, A.C., Berat, C., Berggren, M., Bertini, D., Bertrand, D., Besancon, M., Bigi, M., Bilenky, M.S., Bizouard, M-A., Bloch, D., Blom, H.M., Bonesini, M., Bonivento, W., Boonekamp, M., Booth, P.S.L., Borgland, A.W., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T.J.V., Boyko, I., Bozovic, I., Bozzo, M., Branchini, P., Brenke, T., Brenner, R.A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Burgsmueller, T., Buschbeck, B., Buschmann, P., Cabrera, S., Caccia, M., Calvi, M., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Castillo Gimenez, M.V., Cattai, A., Cavallo, F.R., Chabaud, V., Charpentier, Ph., Chaussard, L., Checchia, P., Chelkov, G.A., Chierici, R., Chliapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Cieslik, K., Collins, P., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Cowell, J-H., Crawley, H.B., Crennell, D., Crepe, S., Crosetti, G., Cuevas Maestro, J., Czellar, S., Davenport, M., Da Silva, W., Deghorain, A., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Dolbeau, J., Doroba, K., Dracos, M., Drees, J., Dris, M., Duperrin, A., Durand, J-D., Eigen, G., Ekelof, T., Ekspong, G., Ellert, M., Elsing, M., Engel, J-P., Erzen, B., Espirito Santo, M., Falk, E., Fanourakis, G., Fassouliotis, D., Fayot, J., Feindt, M., Ferrari, P., Ferrer, A., Ferrer-Ribas, E., Ferro, F., Fichet, S., Firestone, A., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B., Frodesen, A.G., Fruhwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, Ph., Gazis, E.N., Gele, D., Gerdyukov, L., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Gonzalez Caballero, I., Gopal, G., Gorn, L., Gorski, M., Gouz, Yu., Gracco, V., Grahl, J., Graziani, E., Green, C., Grimm, H-J., Gris, P., Grosdidier, G., Grzelak, K., Gunther, M., Guy, J., Hahn, F., Hahn, S., Haider, S., Hallgren, A., Hamacher, K., Hansen, J., Harris, F.J., Hedberg, V., Heising, S., Hernandez, J.J., Herquet, P., Herr, H., Hessing, T.L., Heuser, J.-M., Higon, E., Holmgren, S-O., Holt, P.J., Hoorelbeke, S., Houlden, M., Hrubec, J., Huet, K., Hughes, G.J., Hultqvist, K., Jackson, J.N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, Ch., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E.K., Jonsson, P., Joram, C., Juillot, P., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E.C., Keranen, R., Kersevan, B.P., Khomenko, B.A., Khovanski, N.N., Kiiskinen, A., King, B., Kinvig, A., Kjaer, N.J., Klapp, O., Klein, H., Kluit, P., Kokkinias, P., Koratzinos, M., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Krammer, M., Kriznic, E., Krstic, J., Krumstein, Z., Kubinec, P., Kurowska, J., Kurvinen, K., Lamsa, J.W., Lane, D.W., Langefeld, P., Lapin, V., Laugier, J-P., Lauhakangas, R., Leder, G., Ledroit, F., Lefebure, V., Leinonen, L., Leisos, A., Leitner, R., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Lethuillier, M., Libby, J., Liko, D., Lipniacka, A., Lippi, I., Loerstad, B., Loken, J.G., Lopes, J.H., Lopez, J.M., Lopez-Fernandez, R., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Mahon, J.R., Maio, A., Malek, A., Malmgren, T.G.M., Maltezos, S., Malychev, V., Mandl, F., Marco, J., Marco, R., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Martinez-Rivero, C., Martinez-Vidal, F., Marti i Garcia, S., Masik, J., Mastroyiannopoulos, N., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, F., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Mc Pherson, G., Meroni, C., Meyer, W.T., Miagkov, A., Migliore, E., Mirabito, L., Mitaroff, W.A., Mjoernmark, U., Moa, T., Moch, M., Moeller, R., Moenig, K., Monge, M.R., Moreau, X., Morettini, P., Morton, G., Mueller, U., Muenich, K., Mulders, M., Mulet-Marquis, C., Muresan, R., Murray, W.J., Muryn, B., Myatt, G., Myklebust, T., Naraghi, F., Nassiakou, M., Navarria, F.L., Navas, S., Nawrocki, K., Negri, P., Nemecek, S., Neufeld, N., Neumeister, N., Nicolaidou, R., Nielsen, B.S., Nikolenko, M., Nomokonov, V., Normand, A., Nygren, A., Obraztsov, V., Olshevski, A.G., Onofre, A., Orava, R., Orazi, G., Osterberg, K., Ouraou, A., Paganoni, M., Paiano, S., Pain, R., Paiva, R., Palacios, J., Palka, H., Papadopoulou, Th.D., Papageorgiou, K., Pape, L., Parkes, C., Parodi, F., Parzefall, U., Passeri, A., Passon, O., Pegoraro, M., Peralta, L., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H.T., Pierre, F., Pimenta, M., Piotto, E., Podobnik, T., Pol, M.E., Polok, G., Poropat, P., Pozdniakov, V., Privitera, P., Pukhaeva, N., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P.N., Read, A.L., Rebecchi, P., Redaelli, N.G., Regler, M., Reid, D., Reinhardt, R., Renton, P.B., Resvanis, L.K., Richard, F., Ridky, J., Rinaudo, G., Rohne, O., Romero, A., Ronchese, P., Rosenberg, E.I., Rosinsky, P., Roudeau, P., Rovelli, T., Royon, Ch., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sampsonidis, D., Sannino, M., Schneider, H., Schwemling, Ph., Schwering, B., Schwickerath, U., Schyns, M.A.E., Scuri, F., Seager, P., Sedykh, Y., Segar, A.M., Sekulin, R., Shellard, R.C., Sheridan, A., Siebel, M., Simard, L., Simonetto, F., Sisakian, A.N., Smadja, G., Smirnov, N., Smirnova, O., Smith, G.R., Solovianov, O., Sopczak, A., Sosnowski, R., Spassov, T., Spiriti, E., Sponholz, P., Squarcia, S., Stanescu, C., Stanic, S., Stevenson, K., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tegenfeldt, F., Terranova, F., Thomas, J., Timmermans, J., Tinti, N., Tkatchev, L.G., Todorova, S., Tomaradze, A., Tome, B., Tonazzo, A., Tortora, L., Transtromer, G., Treille, D., Tristram, G., Trochimczuk, M., Troncon, C., Tsirou, A., Turluer, M-L., Tyapkin, I.A., Tzamarias, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Van Apeldoorn, G.W., Van Dam, P., Van Doninck, W.K., Van Eldik, J., Van Lysebetten, A., Van Remortel, N., Van Vulpen, I., Vassilopoulos, N., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L.S., Verzi, V., Vilanova, D., Vitale, L., Vlasov, E., Vodopyanov, A.S., Vollmer, C., Voulgaris, G., Vrba, V., Wahlen, H., Walck, C., Weiser, C., Wicke, D., Wickens, J.H., Wilkinson, G.R., Winter, M., Witek, M., Wolf, G., Yi, J., Yushchenko, O., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N.I., Zucchelli, G.C., and Zumerle, G.

Abstract

Measurements of the trilinear gauge boson couplings WWγand WWZare presented from data taken by DELPHI in 1997 at an energy of 183 GeV. From a study of the reactions e+e−→W+W−, e+e−→Weνand e+e−→ννγ, values are obtained for Δg1Zand Δκγ, the differences of the WWZcharge coupling and of the WWγdipole couplings from their Standard Model values, and for λγ, the WWγquadrupole coupling. The observations are consistent with the predictions of the Standard Model.

Published
1999
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38. Production of strange B-baryons decaying into Ξ∓−ℓ∓ pairs at LEP

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Amato, S., Andreazza, A., Andrieux, M. L., Antilogus, P., Apel, W-D., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K-H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blume, M., Blyth, S., Bocci, V., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Branchini, P., Brand, K. D., Brenner, R. A., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Buys, A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Camporesi, T., Canale, V., Canepa, M., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Caso, C., Cassio, V., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chapkin, M., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chochula, P., Chorowicz, V., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Crawley, H. B., Crennell, D., Crosetti, G., Cuevas Maestro, J., Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daum, A., Dauncey, P. D., Davenport, M., Da Silva, W., Defoix, C., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., De Saint-Jean, C., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Drees, K. -A., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Eigen, G., Ekelof, T., Ekspong, G., Elsing, M., Engel, J. -P., Ershaidat, N., Espirito Santo, M., Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J-P., Gillespie, D., Gokieli, R., Golob, B., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Gunther, M., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S-O., Holt, P. J., Holthuizen, D., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Jackson, J. N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonsson, L., Joram, C., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. -H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krumstein, Z., Krupinski, W., Kubinec, P., Kucewicz, W., Kurvinen, K., Lacasta, C., Laktineh, I., Lamblot, S., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Lane, D. W., Langefeld, P., Lapin, V., Last, I., Laugier, J-P., Lauhakangas, R., Leder, G., Ledroit, F., Lefebure, V., Legan, C. K., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez, J. M., Lopez-Fernandez, A., Lopez Aguera, M. A., Loukas, D., Lutz, P., Lyons, L., MacNaughton, J., Maehlum, G., Maio, A., Maltezos, A., Malychev, V., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Maron, T., Martinez-Rivero, C., Martinez-Vidal, F., Marti i Garcia, S., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Cubbin, M. Mc, Kay, R. Mc, Nulty, R. Mc, Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mirabito, L., Mitaroff, W. A., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Mundim, L. M., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Navas, S., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Niss, P., Nomerotski, A., Normand, A., Oberschulte-Beckmann, W., Obraztsov, V., Olshevski, A. G., Onofre, A., Orava, R., Ostankov, A., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pages, P., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Rybicki, K., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Sedykh, Y., Segar, A. M., Seitz, A., Sekulin, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Sitar, B., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tavernet, J. P., Tchikilev, O., Theodosiou, G. E., Tilquin, A., Timmermans, J., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Trombini, A., Troncon, C., Tsirou, A., Turluer, M-L., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Doninck, W. K., Van Eldik, J., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wicke, D., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yu, L., Zach, F., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., Zucchelli, G. C., and Zumerle, G.

Abstract

An excess of events containing, in a jet, a samesign Ξ∓−ℓ∓ pair as compared to those with an oppositesign Ξ∓−ℓ± pair has been observed in an analysis of 1.7 million hadronic Z0 decays collected by the DELPHI detector at LEP between 1991 and 1993 inclusive. The probability for this signal to come from non B-baryon decays is less than 5×10−4. The measured production fraction corresponds to: per lepton species, averaged for electrons and muons and assuming that the two channels have an equal contribution. Semileptonic decays of Λb baryons can account for less than 10% of these events and the major part of the signal has to originate from Ξb semileptonic decays. Using the subsample of these events where the Ξ∓ trajectory has been measured in the Vertex Detector, the lifetime of B-baryons producing a Ξ∓ in their semileptonic decay final state is found to be: $$\tau (B - baryon \to \Xi ^ - \ell ^ - X) = 1.5_{ - 0.4}^{ + 0.7} \pm 0.3ps.$$

Published
1995
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39. Search for pair-produced heavy scalars in Z0 decays

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Apel, W-D., Apsimon, R. J., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Becks, K-H., Begalli, M., Beilliere, P., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blocki, J., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Buys, A., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campion, R., Camporesi, T., Canale, V., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Caso, C., Castelli, E., Gimenez, M. V. Castillo, Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Chapkin, M., Charpentier, Ph., Chauveau, J., Checchia, P., Chelkov, G. A., Chevalier, L., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Cosmo, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Maestro, J. Cuevas, Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Silva, W. Da, Defoix, C., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J-P., Ershaidat, N., Santo, M.Espirito, Falaleev, V., Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J-L., Francon, S., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J-P., Giacomelli, P., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Cadenas, J. J. Gomez Y, Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hamel De Monchenault, G., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S-O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P-S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krupinski, W., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J-P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Lieb, E., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Aguera, M. A. Lopez, Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Cubbin, M.Mc, Kay, R.Mc, Nulty, R.Mc, Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nilsen, P. E. S., Niss, P., Nomerotski, A., Normand, A., Novak, M., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Romero, A., Roncagliolo, I., Ronchese, P., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Sessa, M., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turluer, M-L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Ferrer, J. A. Valls, Velde, C.Vander, Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, W. K., Van Eldik, J., Vaz, P., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Wahlen, H., Walck, C., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yushchenko, O., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

A search for charged Higgs bosons decaying into quarks is described, based on statistics of around 1.7 million hadronic Zo decays detected in DELPHI. Despite the very high background from standard hadronic decays of the Zo, masses in the range up to 43.5 GeV/c2 are excluded at the 95% confidence level. After combination with a search for leptonic decays, this mass limit is extended to cover all branching ratios. A similar analysis sets new limits on the possible production of any pair-produced heavy scalar decaying into a pair of jets, such as neutral Higgs bosons in a two doublet scheme and diquarks.

Published
1994
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40. Invariant mass dependence of particle correlations in hadronic final states from the decay of theZ0

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Aleksan, R., alekseev, G. D., Allport, P., Almehed, S., Almeida Junior, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Apel, W. -D., Apsimon, R. J., Arnoud, Y., Åsman, B., Augustin, J. -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Becks, K. -H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blocki, J., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostiancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J. -M., Budziak, A., Bugge, L., Buran, T., Buys, A., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Rozas, A. J. Camacho, Campion, R., Camporesi, T., Canale, V., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Gimenez, M. V. Castillo, Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Chapkin, M., Charpentier, Ph., Chauveau, J., Checchia, P., Chelkov, G. A., Chevalier, L., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Maestro, J. Cuevas, Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Darbo, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Da Silva, W., Defoix, C., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Eek, L. -O., Ehret, R., Ekelof, T., Ekspong, G., Peisert, A. Elliot, Elsing, M., Engel, J. -P., Ershaidat, N., Santo, M. Espirito, Falaleev, V., Fassouliotis, D., Feindt, M., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Forbes, K. A. J., Formenti, F., Fousset, J. -L., Francon, S., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gerber, J. -P., Giacomelli, P., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Cadenas, J. J. Gomez Y, Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Grossetete, B., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., De Monchenault, G. Hamel, Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higgins, C. O., Higon, E., Hilke, H. J., Hill, T. S., Hodgson, S. D., Holmgren, S. -O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P. -S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J. -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Levy, J. M., Lieb, E., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Aguera, M. A. Lopez, Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J. -C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., McCubbin, M., McKay, R., McNulty, R., Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Nilsen, P. E. S., Niss, P., Nomerotski, A., Obraztsov, V., Olshevski, A. G., Orava, R., Ostankov, A., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Perevozchikov, V., Pernegger, H., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Romero, A., Roncagliolo, I., Ronchese, P., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Rybicki, K., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Sessa, M., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skjevling, G., Smadja, G., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Szymanski, P., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turala, M., Turluer, M. -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Ferrer, J. A. Valls, Velde, C. Vander, Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, w. K., Van Eldik, J., Vaz, P., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Wormser, G., Woschnagg, K., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign pions. Strong correlations are observed only at small masses. The correlations decrease very rapidly for like-sign pions and slowly for unlike-sign pions, manifesting different particle dynamics. The like-sign correlations exhibit a power-law behaviour as a function of mass, compatible with the previously observed intermittency effect. The predictions of the parton shower model (JETSET 7.3) deviate significantly from the data. However, good agreement is obtained with the mass correlations, both for the unlike-sign and for the like-sign pairs if the production of the ?' and ?0 mesons is reduced and Bose-Einstein correlations are included in the model. The value of the Bose-Einstein correlation strength is consistent with unity for pions which are produced directly or in the decays of short-lived resonances.

Published
1994
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41. A precision measurement of the average lifetime ofB hadrons

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Aleksan, R., Alekseev, G. D., Allport, P., Almehed, S., Almeida Junior, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Apel, W. -D., Apsimon, R. J., Arnoud, Y., Åsman, B., Augustin, J. -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Becks, K. -H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blocki, J., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Brunet, J. -M., Bugge, L., Buran, T., Buys, A., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Rozas, A. J. Camacho, Campion, R., Camporesi, T., Canale, V., Cabkocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Caso, C., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Charpentier, Ph., Chauveau, J., Checchia, P., Chelkov, G. A., Chevalier, L., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Crosetti, G., Maestro, J. Cuevas, Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Da Silva, W., Defoix, C., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, D., De Min, A., De Paula, L., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Eek, L. -O., Ehret, R., Ekelof, T., Ekspong, G., Peisert, A. Elliot, Elsing, M., Engel, J. -P., Ershaidat, N., Santo, M. Espirito, Falaleev, V., Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Filipas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Forbes, K. A. J., Formenti, F., Fousset, J. -L., Francon, S., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Fustenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gerber, J. -P., Giacomelli, P., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Cadenas, J. J. Gomez Y, Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Grossetete, B., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hamel De Monchenault, G., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higgins, C. O., Higon, E., Hilke, H. J., Hill, T. S., Hodgson, S. D., Holmogren, S. -O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P. -S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkionias, P., Koratzinos, M., Korcyl, K., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krupinski, W., Kulka, K., Kurvinen, K., Lacasta, C., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J. -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Lieb, E., Liko, D., Linder, R., Lipnicka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Feernandez, A., Lopez Aguera, M. A., Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J. -C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Mattekuzzi, C., Mathiae, G., Mazzucato, M., Cubbin, M. Mc., Kay, R. Mc, Nulty, R. Mc., Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Nilsen, P. E. S., Niss, P., Nomerotski, A., Novak, M., Obraztsov, V., Olshevski, A. G., Orava, R., Ostankov, A., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopouliou, Th. D., Page, L., Parodi, F., Parodi, A., Pegoraro, M., Pennanen, J., Peralta, L., Perevozchikov, V., Pernegger, H., Perrotta, A., Petridou, C., Petrolini, A., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P. N., Read, A. L., Reale, M., Rebechi, P., Redaelli, N. G., Regler, M., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Rinaudo, A., Romero, A., Roncagliolo, I., Ronchese, P., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhklmann-Keleider, V., Ruizt, A., Rybicki, K., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Sciolla, G., Simonetto, F., Sisakian, A. N., Skjevling, G., Smadja, G., Smirnova, O., Smith, G. R., Sonsnowski, R., Souza-Santos, D., Spassov, T., Spassov, E., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stanescu, C., Stapnes, S., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Strauss, J., Straver, J., Stugu, R., Szczekowski, M., Szeptycka, M., Szymanski, P., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Torassa, E., Tortora, L., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turala, M., Turluer, M. -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ulland, O., Uvarov, V., Vallazza, G., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Der Hejiden, M., Van Doninck, W. K., Van Eldik, J., Vaz, P., Vengi, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Wahlen, H., Walck, C., Waldner, F., Wehr, A., Weierstall, M., Weilhmmer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

The average lifetime ofB hadrons was measured using data collected with the DELPHI detector at the LEP collider during 1991 and 1992. The measurement was performed using two different anayses. The first method was an improvement on a previous technique, which used charged particle impact parameter distributions. This analysis measured an average lifetime forB hadrons of(1) $$\tau _B = 1.542 \pm 0.021(stat.) \pm 0.045(syst.)ps.$$ The second method was based on a new technique, which used inclusively reconstructed secondary vertices to measure(2) $$\tau _B = 1.599 \pm 0.014(stat.) \pm 0.035(syst.)ps.$$ Taking into account both the statistical and systematic corelations, the results of these two methods were combined to give an average lifetime forB hadrons of(3) $$\tau _B = 1.582 \pm 0.012(stat.) \pm 0.032(syst.)ps.$$

Published
1994
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42. A study of radiative muon-pair events at Z0 energies and limits on an additional Z′ gauge beson

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Apel, W -D., Apsimon, R. J., Arnoud, Y., Asman, B., Augustin, J -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K -H., Begalli, M., Beilliere, P., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blocki, J., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Brunet, J -M., Bugge, L., Buran, T., Buys, A., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campion, R., Camporesi, T., Capale, V., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Caso, C., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Chapkin, M., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Cosmo, G., Cossutti, C., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Cuevas Maestro, J., Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Da Silva, W., Defoix, C., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., De Saint-Jean, C., Diikstra, H., Di Ciaccio, L., Diama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J -P., Ershaidat, N., Espirito Santo, M., Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J -L., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J -P., Giacomelli, P., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Gomez Y Cadenas, J. J., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S -O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P -S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korcyl, K., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krupinski, W., Kulka, K., Kurvinen, K., Lacasta, C., Laktineh, I., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Lieb, E., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J -C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Cubbin, M. Mc, Kay, R. Mc, Nulty, R. Mc, Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, R., Nicolaidou, R., Nielsen, B. S., Niss, P., Nomerotski, A., Normand, A., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegararo, M., Pennanen, J., Peralta, L., Pernegger, H., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Rybicki, K., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turala, M., Turluer, M -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, W. K., Van Eldik, J., Vaz, P., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Wahlen, H., Walck, C., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yushchenko, O., Zach, F., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

An analysis is reported on the channele+e-?µ+µ-(n?), n=1,2..., using data taken with the DELPHI detector at LEP from 1990 to 1992. Differential cross sections of the radiative photons as a function of photon energy and of the angle between the photon and the muon are presented. No significant deviations from expectations are observed. The data are also used to extract the muon-pair cross section and asymmetry below the Z0 peak by using those events with relatively hard initial state radiative photon(s). The measured cross section and asymmetry show no significant deviation from the Standard Model expectations. These results together with the DELPHI cross section and asymmetry measurements at the LEP energies from the 1990 to 1992 running periods are used to determine limits on the Z0-Z' gauge boson mixing angle ?Z' and on the Z' mass. There is no indication of the existence of a Z'; the limits obtained on the mixing angle substantially improve upon existing limits. The 95% confidence level allowed ranges of ?Z' in various models are: $$\begin{gathered} - 0.0070 \leqslant \theta _{Z'} \leqslant 0.0078,E_6 (\chi )\bmod el, \hfill \\ - 0.0075 \leqslant \theta _{Z'} \leqslant 0.0095,E_6 (\psi )\bmod el, \hfill \\ - 0.029 \leqslant \theta _{Z'} \leqslant 0.029,E_6 (\eta )\bmod el, \hfill \\ - 0.0068 \leqslant \theta _{Z'} \leqslant 0.0082,L - R(1.)\bmod el, \hfill \\ - 0.0057 \leqslant \theta _{Z'} \leqslant 0.0077,L - R(\sqrt 2 )\bmod el. \hfill \\ \end{gathered} $$

Published
1995
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43. Measurement of the forward-backward asymmetry of charm and bottom quarks at theZ pole usingD*± mesons

Author

Abreu, P., Adam, W., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Andrieux, M. L., Antilogus, P., Apel, W-D., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K-H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blume, M., Blyth, S., Bocci, V., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Buys, A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Camporesi, T., Canale, V., Canepa, M., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Caso, C., Cassio, V., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chochula, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Cuevas Maestro, J., Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daum, A., Dauncey, P. D., Davenport, M., Da Silva, W., Defoix, C., Dellaricca, G., Ricca, G.Della, Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clereq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, A., De Saint-Jean, C., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Drees, K. -A., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J-P., Ershaidat, N., Santo, M.Espirito, Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J-L., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J-P., Gillespie, D., Gokieli, R., Golob, B., Gomez Y Cadenas, J. J., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S-O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P-S., Jackson, J. N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katargin, A., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. M., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. -H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krumstein, Z., Krupinski, W., Kubinec, P., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Laktineh, I., Lambropoulos, C., Lamsa, J. W., Lanccri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J-P., Lauhakangas, R., Leder, G., Ledroit, F., Lefebure, V., Lemoigne, R.LeitnerNC Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Malychev, V., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Maron, T., Martinez-Rivero, C., Martinez-Vidal, F., Marti i Garcia, S., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Kay, M. Mc, Kay, R. Mc, Nulty, R. Mc, Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Navas, S., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Niss, P., Nomerotski, A., Normand, A., Oberschulte-Beckmann, W., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Perevozchikov, V., Pernegger, H., Perrotta, A, Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Ronjin, V., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Sedykh, Y., Segar, A. M., Seitz, A., Sekulin, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Sitar, B., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Turleur, M-L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Doninck, W. K., Van Eldik, J., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wicke, D., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yushchenko, O., Zach, F., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., Zucchelli, G. C., and Zumerle, G.

Abstract

The forward-backward asymmetries for the processes " and " at theZ resonance are measured using identifiedD*± mesons. In 905,000 selected hadronic events, taken in 1991 and 1992 with the DEL-PHI detector at LEP, 4757D*+?D0p+ decays are reconstructed. Thec andb quark forward-backward asymmetries are determined to be: $$\begin{gathered} A_{FB}^{c\bar c} = 0.077 \pm 0.029(stat) \pm 0.012(sys), \hfill \\ A_{FB}^{b\bar b} = 0.059 \pm 0.062(stat) \pm 0.024(sys). \hfill \\ \end{gathered} $$ Constraining theb asymmetry to the value measured by DELPHI using independent analyses, the charm asymmetry is determined to be: $$A_{FB}^{c,const} = 0.068 \pm 0.027(stat) \pm 0.011(sys).$$ . This result corresponds to an effective electroweak mixing angle measured using charm quark events of: $$\sin ^2 \theta _{eff}^{lept} = 0.2307 \pm 0.0062(stat) \pm 0.0026(sys).$$

Published
1995
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44. Measurement of <img src="/fulltext-image.asp?format=htmlnonpaginated&src=J371570667T30407_html\10052_2005_Article_BF01556358_TeX2GIFIE1.gif" border="0" alt=" $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }}$$ " /> using impact parameter measurements a

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Amato, S., Andreazza, A., Andrieux, M. L., Antilogus, P., Apel, W-D., Arnoud, Y., Åsman, B., Augustin, J-E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K. -H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blume, M., Blyth, S., Bocci, V., Bolognese, T., bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J-M., Bugge, L., Buran, T., Buys, A., Caccia, M., Calvi, M., Rozas, A. J. Camacho, Camporesi, T., Canale, V., Canepa, M., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Caso, C., Cassio, V., Gimenez, M. V. Castillo, Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chochula, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Crawley, H. B., Crennell, D., Crosetti, G., Maestro, J. Cuevas, Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daum, A., Dauncey, P. D., Davenport, M., Da Silva, W., Defoix, C., Ricca, G. Della, Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., De Saint-Jean, C., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Drees, K. -A., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J-P., Ershaidat, N., Santo, M. Espirito, Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J-L., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J-P., Gillespie, D., Gokieli, R., Golob, B., Gomez Y Cadenas, J. J., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S-O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P-S., Jackson, J. N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korcyl, K., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. -H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krumstein, Z., Krupinski, W., Kubinec, P., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Laktineh, I., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J-P., Lauhakangas, R., Ledroit, F., Lefebure, V., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Malychev, V., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J-C., Mariotti, C., Markou, A., Maron, T., Martinez-Rivero, C., Martinez-Vidal, F., Garcia, S. Marti i, Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Cubbin, M. Mc, Kay, R. Mc, Nulty, R. Mc, Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Navas, S., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Niss, P., Nomerotski, A., Normand, A., Oberschulte-Beckmann, W., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pages, P., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Perevozchikov, V., Pernegger, H., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sadovsky, A., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Sedykh, Y., Segar, A. M., Seitz, A., Sekulin, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Sitar, B., Skaali, T. B., smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, R., Stichelbaut, F., Stocchi, A., Strauss, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Tilquin, A., Timmermans, J., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Trombini, A., Troncon, C., Tsirou, A., Turluer, M-L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Ferrer, J. A. Valls, Van Apeldoorn, G. W., Van Dam, P., Van Doninck, W. K., Van Eldik, J., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wicke, D., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yushchenko, O., Zach, F., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., Zucchelli, G. C., and Zumerle, G.

Abstract

The partial decay width of theZ to " quark pairs has been measured by the DELPHI detector at LEP.b-hadrons, containingb-quarks, were tagged by leptons with high transverse momentum relative to the hadron or by tracks with large impact parameters to the primary vertex.

Published
1995
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45. Measurement of the forward-backward asymmetry ofe+e−→Z→ <img src="/fulltext-image.asp?format=htmlnonpaginated&src=T8K1P5105345TX26_html\10052_2005_Article_BF01578667_TeX2GIFIE1.gif" border="0" alt=" $$b\bar

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Apel, W -D., Apsimon, R. J., Arnoud, Y., Åsman, B., Augustin, J -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K -H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Brieman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J -M., Bugge, L., Buran, T., Buys, A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campion, R., Camporesi, T., Canale, V., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Caso, C., Cassio, V., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Cuevas Maestro, J., Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Da Silva, W., Defoix, C., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., De Saint-Jean, C., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J -P., Ershaidat, N., Santo, M. Espirito, Fassouliotis, D., Feindt, M., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J -L., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J -P., Gerdyukov, L., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Gomez Y Cadenas, J. J., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S -O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P -S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. -H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krupinski, W., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Laktineh, I., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Levy, J. M., Lieb, E., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J -C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Cubbin, M. Mc, Kay, R. Mc, Nulty, R. Mc, Medbo, J., Meroni, C., Meyer, W. T., Miagkov, A., Michelotto, M., Migliore, E., Mirabito, L., Mitaroft, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Niss, P., Nomerotski, A., Normand, A., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Pernegger, H., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdiniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sokolov, A., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turluer, M -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, W. K., Van Eldik, J., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yushchenko, O., Zach, F., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

The forward-backward asymmetry of the processe+e-?Z?b " has been measured using events collected by the DELPHI experiment during the 1991 and 1992 LEP runs. This data sample corresponded to 884 000 hadronicZ decays at a centre-of-mass energy ". The tagging of b-quark events was performed using two approaches; the first was based on the semileptonic decay channelsb?X+µ andb?X+e, the second used a lifetime tag with jet-charge reconstruction. The results of these two methods were combined to give $$A_{FB}^{b\bar b} = 0.107 \pm 0.011(stat. + syst. + mixing).$$

Published
1995
Full Text
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46. Measurement of the <img src="/fulltext-image.asp?format=htmlnonpaginated&src=V030943W4762642V_html\10052_2005_Article_BF01578666_TeX2GIFIE1.gif" border="0" alt=" $$\Gamma _{b\bar b} /\Gamma _{had} $$ " /> branching ratio of thez by double hemi

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Apel, W -D., Apsimon, R. J., Arnoud, Y., Asman, B., Augustin, J -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K -H., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blocki, J., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J -M., Bugge, L., Buran, T., Buys, A., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campion, R., Camporesi, T., Canale, V., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Caso, C., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Maestro, J. Cuevas, Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Da Silva, W., Defoix, C., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., De Saint-Jean, C., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J -P., Ershaidat, N., Santo, M. Espirito, Fassouliotis, D., Feindt, M., Fenyuk, A., Ferrer, A., Fillippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J -L., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J -P., Giacomelli, P., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Gomez Y Cadenas, J. J., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S -O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P -S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krupinski, W., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Laktineh, I., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Lieb, E., Liko, D., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Marco, J., Marechal, B., Margoni, M., Marin, J -C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Cubbin, M. Mc., Kay, R. Mc, Nulty, R. Mc, Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Nikolaenko, V., Niss, P., Nomerotski, A., Normand, A., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Perevozchikov, V., Pernegger, H., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Rames, J., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Ronjin, V., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Sessa, M., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Douza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., torassa, E., Tortora, L., Transtromer, G., Treille, D., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turluer, M -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, W. K., Van Eldik, J., Vaz, P., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Yushchenko, O., Zach, F., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

Two measurements of " are presented. Both measurements use 250000Z decays taken with the DELPHI detector in 1991 and rely mainly on the precision of the microvertex detector. One tagging method is as simple as possible so that background rates can be reliably predicted by simulation. The other one uses a more involved tagging technique and reduces the dependence on simulation as much as possible. Combining both results, " is found to be 0.2209±0.0041(stat.)±0.0042(syst.)±0.0018 ".

Published
1995
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47. Production characteristics of K0 and light meson resonances in hadronic decays of theZ0

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Ajinenko, I., Aleksan, R., Alekseev, G. D., Allport, P. P., Almehed, S., Almeida, F. M. L., Alvsvaag, S. J., Amaldi, U., Andreazza, A., Antilogus, P., Anykeyev, V., Apel, W -D., Apsimon, R. J., Arnoud, Y., Asman, B., Augustin, J -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Baudot, J., Becks, K -H., Begalli, M., Beilliere, P., Beltran, P., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bigi, M., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blocki, J., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borisov, G., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brillault, L., Brown, R. C. A., Bruckman, P., Brunet, J -M., Bugge, L., Buran, T., Buys, A., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campion, R., Camporesi, T., Canale, V., Cankocak, K., Cao, F., Carena, F., Carrilho, P., Carroll, L., Cases, R., Caso, C., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Chapkin, M., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Cindro, V., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Cuevas Maestro, J., Czellar, S., Dahl-Jensen, E., Dahm, J., Dalmagne, B., Dam, M., Damgaard, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., Davies, J., Da Silva, W., Defoix, C., Delpierre, P., Demaria, N., De Angelis, A., De Boeck, H., De Boer, W., De Brabandere, S., De Clercq, C., De Fez Laso, M. D. M., De La Vaissiere, C., De Lotto, B., De Min, A., De Paula, L., De Saint-Jean, C., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dupont, F., Edsall, D., Ehret, R., Ekelof, T., Ekspong, G., Elsing, M., Engel, J. -P., Ershaidat, N., Espirito Santo, M., Fassouliotis, D., Feindt, M., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Formenti, F., Fousset, J -L., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gamba, D., Gandelman, M., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gele, D., Gerber, J -P., Giacomelli, P., Gillespie, D., Gokieli, R., Golob, B., Golovatyuk, V. M., Gomez Y Cadenas, J. J., Gopal, G., Gorn, L., Gorski, M., Gracco, V., Grard, F., Graziani, E., Grosdidier, G., Gunnarsson, P., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Hahn, S., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hao, W., Harris, F. J., Hedberg, V., Henriques, R., Hernandez, J. J., Hernando, J. A., Herquet, P., Herr, H., Hessing, T. L., Higon, E., Hilke, H. J., Hill, T. S., Holmgren, S -O., Holt, P. J., Holthuizen, D., Honore, P. F., Houlden, M., Hrubec, J., Huet, K., Hultqvist, K., Ioannou, P., Iversen, P -S., Jackson, J. N., Jacobsson, R., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kaiser, M., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Kovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Koratzinos, M., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krammer, M., Kreuter, C., Krolikowski, J., Kronkvist, I., Krupinski, W., Kucewicz, W., Kulka, K., Kurvinen, K., Lacasta, C., Laktineh, I., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Langefeld, P., Lapin, V., Last, I., Laugier, J -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Levy, J. M., Lieb, R., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maio, A., Maltezos, A., Mandl, F., Marco, J., Marechal, B., Margoni, M., Marin, J -C., Mariotti, C., Markou, A., Maron, T., Marti, S., Martinez-Rivero, C., Martinez-Vidal, F., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Medbo, J., Meroni, C., Meyer, W. T., Michelotto, M., Migliore, E., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Naraghi, F., Navarria, F. L., Negri, P., Nemecek, S., Neumann, W., Neumeister, N., Nicolaidou, R., Nielsen, B. S., Niss, P., Nomerotski, A., Normand, A., Novak, M., Obraztsov, V., Olshevski, A. G., Orava, R., Osterberg, K., Ouraou, A., Paganini, P., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Parodi, F., Passeri, A., Pegoraro, M., Pennanen, J., Peralta, L., Pernegger, H., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Phillips, H. T., Piana, G., Pierre, F., Pimenta, M., Plaszczynski, S., Podobrin, O., Pol, M. E., Polok, G., Poropat, P., Pozdniakov, V., Prest, M., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P. N., Read, A. L., Reale, M., Rebecchi, P., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, J., Ridky, J., Rinaudo, G., Ripp, I., Romero, A., Roncagliolo, I., Ronchese, P., Roos, L., Rosenberg, E. I., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Seitz, A., Sekulin, R., Sessa, M., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skaali, T. B., Smadja, G., Smirnov, N., Smirnova, O., Smith, G. R., Sosnowski, R., Souza-Santos, D., Spassov, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavitski, I., Stavropoulos, G., Stepaniak, K., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Stugu, B., Szczekowski, M., Szeptycka, M., Tabarelli, T., Tchikilev, O., Theodosiou, G. E., Thome, Z., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tomaradze, A., Tome, B., Torassa, E., Tortora, L., Transtromer, G., Treille, D., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turluer, M -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, W. K., Van Eldik, J., Vaz, P., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Verlato, M., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wehr, A., Weierstall, M., Weilhammer, P., Wetherell, A. M., Wickens, J. H., Wielers, M., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormser, G., Woschnagg, K., Yip, K., Zach, F., Zaitsev, A., Zalewski, Z., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zhigunov, V., Zimin, N. I., Zito, M., Zontar, D., Zuberi, R., and Zumerle, G.

Abstract

An analysis of inclusive production of K0 and the meson resonances K*±(892), ?0(770),f0(975) andf2(1270) in hadronic decays of the Z0 is presented, based on about 973,000 multihadronic events collected by the DELPHI detector at LEP during 1991 and 1992. Overall multiplicities have been determined as 1.962±0.060 K0 mesons, 0.712±0.067 K*±(892) and 1.21±0.15?0(770) per hadronic Z0 decay. The average multiplicities off0(975) for scaled momentum,xp, in the range 0.05=xp=0.6 and off2(1270) for 0.05=xp=1.0 are 0.098±0.016 and 0.170±0.043 respectively. Thef0(975) and ?0(770)xp-spectra have similar shapes. Thef2(1270)/?0(770) ratio increases withxp. The average multiplicities and the differential cross sections are compared with the JETSET Parton Shower model. The model with default parameters fails to reproduce the experimental K0 momentum spectrum at low momentum, describes the K*±(892) and ?0(770)xp-spectrum shapes, but significantly overestimates their production rates.

Published
1995
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48. A measurement ofB meson production and lifetime usingDl− events inZ0 decays

Author

Abreu, P., Adam, W., Adye, T., Agasi, E., Alekseev, G. D., Algeri, A., Allen, P., Almehed, S., Alvsvaag, S. J., Amaldi, U., Anassontzis, E. G., Andreazza, A., Antilogus, P., Apel, W -D., Apsimon, R. J., Åsman, B., Augustin, J -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barate, R., Barbiellini, G., Bardin, D. Y., Barker, G. J., Baroncelli, A., Barring, O., Barrio, J. A., Bartl, W., Bates, M. J., Battaglia, M., Baubillier, M., Becks, K -H., Beeston, C. J., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benedic, D., Benvenuti, A. C., Berggren, M., Bertrand, D., Bianchi, F., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blyth, S., Bocci, V., Bogolubov, P. N., Bolognese, T., Bonesini, M., Bonivento, W., Booth, P. S. L., Borgeaud, P., Borisov, G., Borner, H., Bosio, C., Bostjancic, B., Bosworth, S., Botner, O., Bouquet, B., Bourdarios, C., Bowcock, T. J. V., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Briand, H., Bricman, C., Brown, R. C. A., Brummer, N., Brunet, J -M., Bugge, L., Buran, T., Burmeister, H., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campion, R., Camporesi, T., Canale, V., Cao, F., Carena, F., Carroll, L., Caso, C., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Chabaud, V., Chan, A., Charpentier, Ph., Chaussard, L., Chauveau, J., Checchia, P., Chelkov, G. A., Chevalier, L., Chliapnikov, P., Chorowicz, V., Chrin, J. T. M., Clara, M. P., Collins, P., Contreras, J. L., Contri, R., Cortina, E., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Crozon, M., Maestro, J. Cuevas, Czellar, S., Dahl-Jensen, E., Dalmagne, B., Dam, M., Damgaard, G., Darbo, G., Daubie, E., Daum, A., Dauncey, P. D., Davenport, M., David, P., Davies, J., Da Silva, W., Defoix, C., Delikaris, D., Delorme, S., Delpierre, P., Demaria, N., De Angelis, A., De Beer, M., De Boeck, H., De Boer, W., De Clercq, C., De Fez Laso, M. D. M., De Groot, N., De La Vaissiere, C., De Lotto, B., De Min, A., Dijkstra, H., Di Ciaccio, L., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Eek, L. -O., Eerola, P. A. -M., Ehret, R., Ekelof, T., Ekspong, G., Elliot Peisert, A., Engel, J -P., Ershaidat, N., Fassouliotis, D., Feindt, M., Fernandez Alonso, M., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Forbes, K. A. J., Fousset, J -L., Francon, S., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furnival, K., Furstenau, H., Fuster, J., Galeazzi, G., Gamba, D., Garcia, C., Garcia, J., Gaspar, C., Gasparini, U., Gavillet, Ph., Gazis, E. N., Gerber, J -P., Giacomelli, P., Gokieli, R., Golob, B., Golovatyuk, V. M., Gomez Y Cadenas, J. J., Goobar, A., Gopal, G., Gorski, M., Gracco, V., Grant, A., Grard, F., Graziani, E., Grosdidier, G., Gross, E., Grosse-Wiesmann, P., Grossetete, B., Gumenyuk, S., Guy, J., Haedinger, U., Hahn, F., Hahn, M., Haider, S., Hakansson, A., Hallgren, A., Hamacher, K., Hamel De Monchenault, G., Hao, W., Harris, F. J., Henkes, T., Hernandez, J. J., Herquet, P., Herr, H., Hessing, T. L., Hietanen, I., Higgins, C. O., Higon, E., Hilke, H. J., Hodgson, S. D., Hofmokl, T., Holmes, R., Holmgren, S -O., Holthuizen, D., Honore, P. F., Hooper, J. E., Houlden, M., Hrubec, J., Huet, K., Hulth, P. O., Hultqvist, K., Ioannou, P., Isenhower, D., Iversen, P -S., Jackson, J. N., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Johnson, D., Jonker, M., Jonsson, L., Juillot, P., Kalkanis, G., Kalmus, G., Kapusta, F., Karlsson, M., Karvelas, E., Katsanevas, S., Katsoufis, E. C., Keranen, R., Kesteman, J., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klempt, W., Klovning, A., Kluit, P., Koch-Mehrin, A., Koehne, J. H., Koene, B., Kokkinias, P., Kopf, M., Korcyl, K., Korytov, A. V., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Kramer, P. H., Krolikowski, J., Kronkvist, I., Kruener-Marquis, U., Krupinski, W., Kulka, K., Kurvinen, K., Lacasta, C., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Lapin, V., Laugier, J -P., Lauhakangas, R., Leder, G., Ledroit, F., Leitner, R., Lemoigne, Y., Lemonne, J., Lenzen, G., Lepeltier, V., Lesiak, T., Levy, J. M., Lieb, E., Liko, D., Lindgren, J., Lindner, R., Lipniacka, A., Lippi, I., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez-Fernandez, A., Lopez Aguera, M. A., Los, M., Loukas, D., Lozano, J. J., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maltezos, A., Mandl, F., Marco, J., Margoni, M., Marin, J -C., Markou, A., Maron, T., Marti, S., Mathis, L., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., McCubbin, M., McKay, R., McNulty, R., Meola, G., Meroni, C., Meyer, W. T., Michelotto, M., Mikulec, I., Mirabito, L., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Murray, W. J., Muryn, B., Myatt, G., Navarria, F. L., Negri, P., Nielsen, B. S., Nijjhar, B., Nikolaenko, V., Nilsen, P. E. S., Niss, P., Obraztsov, V., Olshevski, A. G., Orava, R., Ostankov, A., Osterberg, K., Ouraou, A., Paganoni, M., Pain, R., Palka, H., Papadopoulou, Th. D., Pape, L., Passeri, A., Pegoraro, M., Pennanen, J., Perevozchikov, V., Pernicka, M., Perrotta, A., Petridou, C., Petrolini, A., Petrovykh, L., Pettersen, T. E., Pierre, F., Pimenta, M., Pingot, O., Plaszczynski, S., Pol, M. E., Polok, G., Poropat, P., Privitera, P., Pullia, A., Radojicic, D., Ragazzi, S., Rahmani, H., Ratoff, P. N., Read, A. L., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, M., Ridky, J., Rinaudo, G., Roditi, I., Romero, A., Roncagliolo, I., Ronchese, P., Ronnqvist, C., Rosenberg, E. I., Rossi, S., Rossi, U., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann-Kleider, V., Ruiz, A., Rybicki, K., Saarikko, H., Sacquin, Y., Sajot, G., Salt, J., Sanchez, J., Sannino, M., Schael, S., Schneider, H., Schulze, B., Schyns, M. A. E., Sciolla, G., Scuri, F., Segar, A. M., Sekulin, R., Sessa, M., Sette, G., Seufert, R., Shellard, R. C., Siccama, I., Siegrist, P., Simonetti, S., Simonetto, F., Sisakian, A. N., Skaali, T. B., Skjevling, G., Smadja, G., Smith, G. R., Sosnowski, R., Spassoff, T. S., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stapnes, S., Stavropoulos, G., Stichelbaut, F., Stocchi, A., Strauss, J., Straver, J., Strub, R., Szczekowski, M., Szeptycka, M., Szymanski, P., Tabarelli, T., Tavernier, S., Tchikilev, O., Theodosiou, G. E., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Toker, O., Torassa, E., Tortora, L., Treille, D., Trevisan, U., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turala, M., Turluer, M -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, S., Ullaland, O., Uvarov, V., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Vander Velde, C., Van Apeldoorn, G. W., Van Dam, P., Van Der Heijden, M., Van Doninck, W. K., Vaz, P., Vegni, G., Ventura, L., Venus, W., Verbeure, F., Vertogradov, L. S., Vilanova, D., Vincent, P., Vitale, L., Vlasov, E., Vodopyanov, A. S., Vollmer, M., Voulgaris, G., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wayne, M., Wehr, A., Weierstall, M., Weilhammer, P., Werner, J., Wetherell, A. M., Wickens, J. H., Wikne, J., Wilkinson, G. R., Williams, W. S. C., Winter, M., Witek, M., Wormald, D., Wormser, G., Woschnagg, K., Yamdagni, N., Yepes, P., Zaitsev, A., Zalewska, A., Zalewski, P., Zavrtanik, D., Zevgolatakos, E., Zhang, G., Zimin, N. I., Zito, M., Zuberi, R., Zukanovich Funchal, R., Zumerle, G., and Zuniga, J.

Abstract

A study ofB meson decays intoDlX final states is presented. In these events, neutral and chargedD mesons originate predominantly fromB+ andB0 decays, respectively. The dilution of this correlation due toD** production has been taken into account. From 263 700 hadronicZ0 decays collected in 1991 with the DELPHI detector at the LEP collider, 92D0?K-p+, 35D+?K-p+p+ and 61D*0?D0p+ followed byD0?K-p+ orD0?K-p+p+p-, are found with an associated lepton of the same charge as the kaon. From theD0l- andD*+l-, the probabilityfd that ab quark hadronizes into aB- (or ") meson is found to be 0.44 ±0.08±0.09, corresponding to a total (Bs+?b) hadronization fraction of 0.12-0.12+0.24. By reconstructing the energy of eachB meson, theb quark fragmentation is directly measured for the first time. The mean value of theB meson energy fraction is: $$\left\langle {X_E (B)} \right\rangle = 0.695 \pm 0.015(stat.) \pm 0.029(syst.)$$

Published
1993
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49. Search for excited charged leptons inZ0 decays

Author

Abreu, P., Adam, W., Adami, F, Adye, T., Akesson, T., Alekseev, G. D., Allen, P., Almehed, S., Alted, F., Alvsvaag, S. J., Amaldi, U., Anassontzis, E., Antilogus, P., Apel, W. -D., Åsman, B., Astier, P., Augustin, J. -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Bardin, D. Y., Baroncelli, A., Barring, O., Bartl, W., Bates, M. J., Baubillier, M., Becks, K. -H., Beeston, C. J., Begalli, M., Beilliere, P., Belokopytov, Yu., Beltran, P., Benedic, D., Benlloch, J. M., Berggren, M., Bertrand, D., Biagi, S., Bianchi, F., Bibby, J. H., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Blyth, S., Bogolubov, P. N., Bolognese, T., Bonapart, M., Bonesini, M., Bonivento, W., Booth, P. S. L., Boratav, M., Borgeaud, P., Borisov, G., Borner, H., Bosio, C., Botner, O., Bouquet, B., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Bricman, C., Brown, R. C. A., Brummer, N., Brunet, J. -M., Bugge, L., Buran, T., Burmeister, H., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campagne, J. -E., Campion, A., Camporesi, T., Canale, V., Cao, F., Carroll, L., Caso, C., Castelli, E., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Charpentier, P., Checchia, P., Chelkov, G. A., Chevalier, L., Chliapnikov, P., Chorowicz, V., Cirio, R., Collins, M. P., Contreras, J. L., Contri, R., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Crosetti, G., Crosland, N., Crozon, M., Cuevas Maestro, J., Czellar, S., Dagoret, S., Dahl-Jensen, E., Dalmagne, B., Dam, M., Damgaard, G., Darbo, G., Daubie, E., Dauncey, P. D., Davenport, M., David, P., De Angelis, A., De Beer, M., De Boeck, H., De Boer, W., De Clercq, C., De Fez Laso, M. D. M., De Groot, N., De La Vaissiere, C., De Lotto, B., De Min, A., Defoix, C., Delikaris, D., Delorme, S., Delpierre, P., Demaria, N., Derkaoui, J., Di Ciaccio, L., Dijkstra, H., Djama, F., Dolbeau, J., Donszelmann, M., Doroba, K., Dracos, M., Drees, J., Dris, M., Dufour, Y., Dulinski, W., Dzhelyadin, R., Eek, L. -O., Eerola, P. A. -M., Ekelof, T., Ekspong, G., Elliot Peisert, A., Engel, J. P., Falaleev, V., Fassouliotis, D., Fernandez Alonso, M., Ferrer, A., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Folegati, P., Fontanelli, F., Forsbach, H., Franek, B., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furnival, K., Furstenau, H., Fuster, J., Gago, J. M., Galeazzi, G., Gamba, D., Garcia, C., Garcia, J., Gasparini, U., Gavillet, P., Gazis, E. N., Gerber, J. -P., Giacomelli, P., Glitza, K. -W., Gokieli, R., Golovatyuk, V. M., Gomez Y Cadenas, J. J., Goobar, A., Gopal, G., Gorski, M., Gracco, V., Grant, A., Grard, F., Graziani, E., Gros, M. -H., Grosdidier, G., Grossetete, B., Gumenyuk, S., Guy, J., Hahn, F., Hahn, M., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hamel De Monchenault, G., Harris, F. J., Heck, B. W., Herbst, I., Hernandez, J. J., Herquet, P., Herr, H., Hietanen, I., Higon, E., Hilke, H. J., Hodgson, S. D., Hofmokl, T., Holmes, R., Holmgren, S. -O., Holthuizen, D., Honore, P. F., Hooper, J. E., Houlden, M., Hrubec, J., Hulth, P. O., Hultqvist, K., Husson, D., Hyams, B. D., Ioannou, P., Isenhower, D., Iversen, P. -S., Jackson, J. N., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Johnson, D., Jonker, M., Jonsson, L., Juillot, P., Kalkanis, G., Kalmus, G., Kantardjian, G., Kapusta, F., Katsanevas, S., Katsoufis, E. C., Keranen, R., Kesteman, J., Khomenko, B. A., Khovanski, N. N., King, B., Kjaer, N. J., Klein, H., Klempt, W., Klovning, A., Kluit, P., Koehne, J. H., Koene, B., Kokkinias, P., Kopf, M., Koratzinos, M., Korcyl, K., Korytov, A. V., Korzen, B., Kostukhin, V., Kourkoumelis, C., Kreuzberger, T., Krolikowski, J., Kruener-Marquis, U., Krupinski, W., Kucewicz, W., Kurvinen, K., Lacasta, C., Lambropoulos, C., Lamsa, J. W., Lanceri, L., Lapin, V., Laugier, J. -P., Lauhakangas, R., Leder, G., Ledroit, F., Lemonne, J., Lenzen, G., Lepeltier, V., Letessier-Selvon, A., Liko, D., Lieb, E., Lillethun, E., Lindgren, J., Lipniacka, A., Lippi, I., Llosa, R., Loerstad, B., Lokajicek, M., Loken, J. G., Lopez Aguera, M. A., Lopez-Fernandez, A., Los, M., Loukas, D., Lounis, A., Lozano, J. J., Lucock, R., Lutz, P., Lyons, L., Maehlum, G., Maillard, J., Maltezos, A., Maltezos, S., Mandl, F., Marco, J., Margoni, M., Marin, J. -C., Markou, A., Marti, S., Mathis, L., Matorras, F., Matteuzzi, C., Matthiae, G., Mazzucato, M., Mc Cubbin, M., Mc Kay, R., Mc Nulty, R., Menichetti, E., Meroni, C., Meyer, W. T., Michelotto, M., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Muller, H., Murray, W. J., Myatt, G., Naraghi, F., Nau-Korzen, U., Navarria, F. L., Negri, P., Nielsen, B. S., Nijjhar, B., Nikolaenko, V., Obraztsov, V., Olshevski, A. G., Orava, R., Ostankov, A., Ouraou, A., Pain, R., Palka, H., Papadopoulou, T., Pape, L., Passeri, A., Pegoraro, M., Perevozchikov, V., Pernicka, M., Perrotta, A., Pierre, F., Pimenta, M., Pingot, O., Pinsent, A., Pol, M. E., Polok, G., Poropat, P., Privitera, P., Pullia, A., Pyythia, J., Radojicic, D., Ragazzi, S., Range, W. H., Ratoff, P. N., Read, A. L., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Richardson, M., Ridky, J., Rinaudo, G., Roditi, I., Romero, A., Roncagliolo, I., Ronchese, P., Ronnqvist, C., Rosenberg, E. I., Rossi, U., Rosso, E., Roudeau, P., Rovelli, T., Ruckstuhl, W., Ruhlmann, V., Ruiz, A., Rybicki, K., Saarikko, H., Sacquin, Y., Salt, J., Sanchez, E., Sanchez, J., Sannino, M., Schaeffer, M., Schneider, H., Scuri, F., Segar, A. M., Sekulin, R., Sessa, M., Sette, G., Seufert, R., Shellard, R. C., Siegrist, P., Simonetti, S., Simonetto, F., Sissakian, A. N., Skaali, T. B., Skjevling, G., Smadja, G., Smith, G. R., Smirnov, N., Sosnowski, R., Spassoff, T. S., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stavropoulos, G., Stichelbaut, F., Stocchi, A., Strauss, J., Strub, R., Stubenrauch, C. J., Szczekowski, M., Szeptycka, M., Szymanski, P., Tabarelli, T., Tavernier, S., Theodosiou, G. E., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Todorov, T., Toet, D. Z., Tortora, L., Trainor, M. T., Treille, D., Trevisan, U., Trischuk, W., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turala, M., Turchetta, R., Turluer, M. -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Ueberschaer, B., Ueberschaer, S., Ullaland, O., Uvarov, V. A., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Van Apeldoorn, G. W., Van Dam, P., Van Doninck, W. K., Van Eijndhoven, N., Vander Velde, C., Varela, J., Vaz, P., Vegni, G., Velasco, J., Ventura, L., Venus, W., Verbeure, F., Vertogradov, L. S., Vibert, L., Vilanova, D., Vlasov, E. V., Vodopyanov, A. S., Vollmer, M., Volponi, S., Voulgaris, G., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wayne, M., Weilhammer, P., Werner, J., Wetherell, A. M., Wickens, J. H., Wikne, J., Wilkinson, G. R., Williams, W. S. C., Winter, M., Wormald, D., Wormser, G., Woschnagg, K., Yamdagni, N., Yepes, P., Zaitsev, A., Zalewska, A., Zalewski, P., Zevgolatakos, E., Zhang, G., Zimin, N. I., Zito, M., Zitoun, R., Zukanovich Funchal, R., Zumerle, G., and Zuniga, J.

Abstract

Using a data sample of 115000 hadronicZ0 decays, a search was performed for the production of excited charged leptons decaying into an ordinary lepton and one photon. Pair production of excited leptons of mass below 45 GeV/c2 is excluded. From an analysis of the lepton-photon mass spectra this experiment is also able to exclude single production of these particles for masses that reach up to 85 GeV/c2, if the compositeness scale is below 1 TeV.

Published
1992
Full Text
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50. Charged particle multiplicity distributions inZ0 hadronic decays

Author

Abreu, P., Adam, W., Adami, F., Adye, T., Alexeev, G. D., Allen, P., Almehed, S., Alted, F., Alvsvaag, S. J., Amaldi, U., Anassontzis, E., Apel, W -D., Asman, B., Astier, P., Astor Ferreres, C., Augustin, J -E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Bardin, D. Y., Baroncelli, A., Barring, O., Bartl, W., Bates, M. J., Baubillier, M., Becks, K -H., Beeston, C. J., Beilliere, P., Belokopytov, I., Beltran, P., Benedic, D., Benlloch, J. M., Berggren, M., Bertrand, D., Biagi, S., Bianchi, F., Bibby, J. H., Bilenky, M. S., Billoir, P., Bjarne, J., Bloch, D., Bogolubov, P. N., Bollini, D., Bolognese, T., Bonapart, M., Booth, P. S. L., Boratav, M., Borgeaud, P., Borner, H., Bosio, C., Botner, O., Bouquet, B., Bozzo, M., Braibant, S., Branchini, P., Brand, K. D., Brenner, R. A., Bricman, C., Brown, R. C. A., Brummer, N., Brunet, J -M., Bugge, L., Buran, T., Burmeister, H., Buytaert, J. A. M. A., Caccia, M., Calvi, M., Camacho Rozas, A. J., Campagne, J -E., Campion, A., Camporesi, T., Canale, V., Cao, F., Carroll, L., Caso, C., Castelli, E., Castillo Gimenez, M. V., Cattai, A., Cavallo, F. R., Cerrito, L., Charpentier, P., Checchia, P., Chelkov, G. A., Chevalier, L., Chliapnikov, P., Chorowicz, V., Cirio, R., Clara, M. P., Contreras, J. L., Contri, R., Cosme, G., Couchot, F., Crawley, H. B., Crennell, D., Cresti, M., Crosetti, G., Crosland, N., Crozon, M., Cuevas Maestro, J., Czellar, S., Dagoret, S., Dahl-Jensen, E., Dalmagne, B., Dam, M., Damgaard, G., Darbo, G., Daubie, E., Dauncey, P. D., Davenport, M., David, P., De Angelis, A., De Beer, M., De Boeck, H., De Boer, W., De Clercq, C., De Fez Laso, M. D. M., De Groot, N., De La Vaissiere, C., De Lotto, B., De Min, A., Defoix, C., Delikaris, D., Delpierre, P., Demaria, N., Di Ciaccio, L., Diddens, A. N., Dijkstra, H., Djama, F., Dolbeau, J., Doll, O., Doroba, K., Dracos, M., Drees, J., Dris, M., Dulinski, W., Dzhelyadin, R., Edwards, D. N., Doll, L -O., Eerola, P. A. -M., Ekelof, T., Ekspong, G., Engel, J -P., Falaleev, V., Fenyuk, A., Fernandez Alonso, M., Ferrer, A., Ferroni, S., Filippas, T. A., Firestone, A., Foeth, H., Fokitis, E., Fontanelli, F., Forsbach, H., Franek, B., Fransson, K. E., Frenkiel, P., Fries, D. C., Frodesen, A. G., Fruhwirth, R., Fulda-Quenzer, F., Furstenau, H., Fuster, J., Gago, J. M., Galeazzi, G., Gamba, D., Gasparini, U., Gavillet, P., Gawne, S., Gazis, E. N., Giacomelli, P., Glitza, K -W., Gokieli, R., Golovatyuk, V. M., Goobar, A., Gopal, G., Gorski, M., Gracco, V., Grant, A., Grard, F., Graziani, E., Gros, M -H., Grosdidier, G., Grossetete, B., Gumenyuk, S., Guy, J., Hahn, F., Hahn, M., Haider, S., Hajduk, Z., Hakansson, A., Hallgren, A., Hamacher, K., Hamel De Monchenault, G., Harris, F. J., Heck, B., Herbst, I., Hernandez, J. J., Herquet, P., Herr, H., Higon, E., Hilke, H. J., Hodgson, S. D., Hofmokl, T., Holmes, R., Holmgren, S -O., Hooper, J. E., Houlden, M., Hrubec, J., Hulth, P. O., Hultqvist, K., Husson, D., Hyams, B. D., Ioannou, P., Ivanyushenkov, I., Iversen, P -S., Jackson, J. N., Jalocha, P., Jarlskog, G., Jarry, P., Jean-Marie, B., Johansson, E. K., Jonker, M., Jonsson, L., Juillot, P., Kadyrov, R. B., Kalkanis, G., Kalmus, G., Kantardjian, G., Kapusta, F., Kapusta, P., Katsanevas, S., Katsoufis, E. C., Keranen, R., Kesteman, J., Khomenko, B. A., King, B., Kjaer, N. J., Klein, H., Klempt, W., Klovning, A., Kluit, P., Koehne, J. H., Koene, B., Kokkinias, P., Kopf, M., Koratzinos, M., Korcyl, K., Korytov, A. V., Korzen, B., Kourkoumelis, C., Kreuzberger, T., Krolikowski, J., Kruener-Marquis, U., Krupinski, W., Kucewicz, W., Kurvinen, K., Laakso, M. I., Lambropoulos, C., Lamsa, J. W., Lancerl, L., Lapin, V., Laugier, J -P., Lauhakangas, R., Laurikainen, P., Leder, G., Ledroit, F., Lemonne, J., Lenzen, G., Lepeltier, V., Letessier-Selvon, A., Lieb, E., Lillestol, E., Lillethun, E., Lindgren, J., Lippi, I., Llosa, R., Lokajicek, M., Loken, J. G., Lopes Aguera, M. A., Lopez-Fernandez, A., Loukas, D., Lozano, J. J., Lucock, R., Lund-Jensen, B., Lutz, P., Lyons, L., Maehlum, G., Magnussen, N., Maillard, J., Maltezos, A., Mandl, F., Marco, J., Marin, J -C., Markou, A., Mathis, L., Matteuzzi, C., Matthiae, G., Mazzucato, M., McCubbin, M., McKay, R., Menichetti, E., Meroni, C., Meyer, W. T., Mitaroff, W. A., Mitselmakher, G. V., Mjoernmark, U., Moa, T., Moeller, R., Moenig, K., Monge, M. R., Morettini, P., Mueller, H., Muller, H., Myatt, G., Naraghi, F., Nau-Korzen, U., Navarria, F. L., Negri, P., Nielsen, B. S., Nikolaenko, V., Obraztsov, V., Orava, R., Ouraou, A., Pain, R., Palka, H., Papadopoulou, T., Pape, L., Passeri, A., Pegoraro, M., Perevozchikov, V., Pernicka, M., Perrotta, A., Pimenta, M., Pingot, O., Pinori, C., Pinsent, A., Pol, M. E., Poliakov, B., Polok, G., Poropat, P., Privitera, P., Pullia, A., Pyyhtia, J., Rademakers, A. A., Radojicic, D., Ragazzi, S., Range, W. H., Ratoff, P. N., Read, A. L., Redaelli, N. G., Regler, M., Reid, D., Renton, P. B., Resvanis, L. K., Richard, F., Ridky, J., Rinaudo, G., Roditi, I., Romero, A., Ronchese, P., Rosenberg, E. I., Rossi, U., Rosso, E., Roudeau, P., Rovelli, T., Ruhlmann, V., Ruiz, A., Saarikko, H., Sacquin, Y., Sanchez, E., Sanchez, J., Sanchis, E., Sannino, M., Schaeffer, M., Schneider, H., Scuri, F., Sebastia, A., Segar, A. M., Sekulin, R., Sessa, M., Sette, G., Seufert, R., Shellard, R. C., Siegrist, P., Simonetti, S., Simonetto, F., Sissakian, A. N., Skaali, T. B., Skeens, J., Skjevling, G., Smadja, G., Smith, G. R., Sosnowski, R., Spang, K., Spassoff, T., Spiriti, E., Squarcia, S., Staeck, H., Stanescu, C., Stavropoulos, G., Stichelbaut, F., Stocchi, A., Strauss, J., Strub, R., Stubenrauch, C. J., Szczekowski, M., Szeptycka, M., Szymanski, P., Tavernier, S., Tchikilev, O., Theodosiou, G., Tilquin, A., Timmermans, J., Timofeev, V. G., Tkatchev, L. G., Toet, D. Z., Topphol, A. K., Tortora, L., Trainor, M. T., Treille, D., Trevisan, U., Tristram, G., Troncon, C., Tsirou, A., Tsyganov, E. N., Turala, M., Turchetta, R., Turluer, M -L., Tuuva, T., Tyapkin, I. A., Tyndel, M., Tzamarias, S., Udo, F., Ueberschaer, S., Uvarov, V. A., Valenti, G., Vallazza, E., Valls Ferrer, J. A., Van Apeldoorn, G. W., Van Dam, P., Van Doninck, W. K., Van Eijndhoven, N., Vander Velde, C., Varela, J., Vaz, P., Vegni, G., Velasco, J., Ventura, L., Venus, W., Verbeure, F., Vertogradov, L. S., Vibert, L., Vilanova, D., Vlasov, E. V., Vodopyanov, A. S., Vollmer, M., Voulgaris, G., Voutilainen, M., Vrba, V., Wahlen, H., Walck, C., Waldner, F., Wayne, M., Wehr, A., Weilhammer, P., Werner, J., Wetherell, A. M., Wickens, J. H., Wikne, J., Wilkinson, G. R., Williams, W. S. C., Winter, M., Wormald, D., Wormser, G., Woschnagg, K., Yamdagni, N., Yepes, P., Zaitsev, A., Zalewska, A., Zalewski, P., Zarubin, P. I., Zevgolatakos, E., Zhang, G., Zimin, N. I., Zitoun, R., Zukanovich Funchal, R., Zumerle, G., and Zuniga, J.

Abstract

This paper presents an analysis of the multiplicity distributions of charged particles produced inZ0 hadronic decays in the DELPHI detector. It is based on a sample of 25364 events. The average multiplicity is ch>=20.71±0.04(stat)±0.77(syst) and the dispersionD=6.28±0.03(stat)±0.43(syst). The data are compared with the results at lower energies and with the predictions of phenomenological models. The Lund parton shower model describes the data reasonably well. The multiplicity distributions show approximate KNO-scaling. They also show positive forward-backward correlations that are strongest in the central region of rapidity and for particles of opposite charge.

Published
1991
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