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          Institute: MPI für Kernphysik     Collection: Heavy Flavour Physics     Display Documents



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ID: 301041.0, MPI für Kernphysik / Heavy Flavour Physics
A Measurement of the ψ′ to J/ψ production ratio in 920 GeV proton-nucleus interactions
Authors:Abt, I.; Adams, M.; Albrecht, H.; Amaral, V.; Amorim, A.; Aplin, S. J.; Aushev, V.; Bagaturia, Y.; Balagura, V.; Bargiotti, M.; Barsukova, O.; Bastos, J.; Bauer, C.; Bauer, T. S.; Belkov, A.; Belkov, Ar; Bertin, A.; Bobchenko, B.; Boecker, M.; Bogatyrev, A.; Bohm, G.; Braeuer, M.; Bruinsma, M.; Bruschi, M.; Buchholz, P.; Buran, T.; Carvalho, J.; Conde, P.; Cruse, C.; Dam, M.; Danielsen, K. M.; Danilov, M.; De Castro, S.; Deppe, H.; Dong, X.; Dreis, H. B.; Egorytchev, V.; Ehret, K.; Eisele, F.; Emeliyanov, D.; Essenov, S.; Fabbri, L.; Faccioli, P.; Feuerstack-Raible, M.; Flammer, J.; Fominykh, B.; Funcke, M.; Garrido, L.; Giacobbe, B.; Glaess, J.; Goloubkov, D.; Goloubkov, Y.; Golutvin, A.; Golutvin, I.; Gorbounov, I.; Gorisek, A.; Gouchtchine, O.; Goulart, D. C.; Gradl, S.; Gradl, W.; Guilitsky, Y.; Hansen, J. D.; Hernandez, J. M.; Hofmann, W.; Hott, T.; Hulsbergen, W.; Husemann, U.; Igonkina, O.; Ispiryan, M.; Jagla, T.; Jiang, C.; Kapitza, H.; Karabekyan, S.; Karpenko, N.; Keller, S.; Khasanov, F.; Kiryushin, Y.; Knöpfle, K. T.; Kolanoski, H.; Korpar, S.; Krauss, C.; Kreuzer, P.; Krizan, P.; Kruecker, D.; Kvaratskheliia, T.; Lanyov, A.; Lau, K.; Lewendel, B.; Lohse, T.; Maenner, R.; Masciocchi, S.; Massa, I.; Matchikhilian, L.; Medin, G.; Medinnis, M.; Mevius, M.; Michetti, A.; Mikhailov, Y.; Mizuk, R.; Muresan, R.; Negodaev, M.; Noerenberg, M.; Nowak, S.; Nunez Pardo de Vera, M. T.; Ouchrif, M.; Ould-Saada, F.; Padilla, C.; Peralta, D.; Pernack, R.; Pestotnik, R.; Piccinini, M.; Pleier, M. A.; Poli, M.; Popov, V.; Pose, D.; Pugatch, V.; Pylypchenko, Y.; Pyrlik, J.; Reeves, K.; Ressing, D.; Riu, I.; Robmann, P.; Rybnikov, V.; Sanchez, F.; Sbrizzi, A.; Schmelling, M.; Schmidt, B.; Schreiner, A.; Schroeder, H.; Schwartz, A. J.; Schwarz, A. S.; Schwenninger, B.; Schwingenheuer, B.; Sciacca, F.; Semprini-Cesari, N.; Shuvalov, S.; Sozuer, L.; Solunin, S.; Somov, A.; Somov, S.; Spengler, J.; Spighi, R.; Spiridonov, A.; Stanovnik, A.; Staric, M.; Stegmann, C.; Symalla, M.; Tikhomirov, I.; Titov, M.; Tsakov, I.; Uwer, U.; van Eldik, C.; Vassiliev, Y.; Villa, M.; Vitale, A.; Vukotic, I.; Wahlberg, H.; Walenta, A. H.; Walter, M.; Wang, J. J.; Wegener, D.; Werthenbach, U.; Wolters, H.; Wurth, R.; Wurz, A.; Zaitsev, Y.; Zavertyaev, M.; Zeuner, T.; Zhelezov, A.; Zheng, Z.; Zimmermann, R.; Zivko, T.; Zoccoli, A.; Aleksandrov, A.; Batista, J.; Grimaldi, F.; Kessler, J.; Kupper, S.; zur Nedden, M.; Prystupa, S.; Rick, H.; Rostovtseva, I.; Silva, L.; Subramania, H. S.; Lomonosov, B.; Agari, Michaela; Belotelov, I.; Groth-Jensen, J.; Gellrich, A.; Hohlmann, M.; Kisel, I.; Klinkby, E.; Mankel, R.; Petersen, B.; Schwanke, U.
Language:English
Corporate body:I. Abt et al. for the HERA-B Collaboration
Research Context:HERA-B
Date of Publication (YYYY-MM-DD):2006-11-18
Title of Journal:The European Physical Journal C - Particles and Fields
Journal Abbrev.:Europ. Phys. J. C
Volume:49
Issue / Number:2
Start Page:545
End Page:558
Copyright:Springer
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Ratios of the ψ′ over the J/ψ production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The ψ′ and J/ψ states were reconstructed in both the μ+μ- and the e+e- decay modes. The measurements covered the kinematic range -0.35≤xF≤0.1 with transverse momentum pT≤4.5 GeV/c. The angular dependence of the ratio has been used to measure the difference of the ψ′ and J/ψ polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is Rψ′(μ)/Rψ′(e)=1.00±0.08±0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B′(μ)B(e))/(B(μ)B′(e)), of ψ′ and J/ψ in the two channels. The ψ′ to J/ψ production ratio is almost constant in the covered xF range and shows a slow increase with pT.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/Heavy Flavour Physics (K. T. Knöpfle, M. Schmelling)
MPI für Physik
External Affiliations:NIKHEF, 1009 DB Amsterdam, The Netherlands
Department ECM, Faculty of Physics, University of Barcelona, E-08028 Barcelona, Spain
Institute for High Energy Physics, Beijing 100039, People's Republic of China
Institute of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
Dipartimento di Fisica dell' Università di Bologna and INFN Sezione di Bologna, I-40126 Bologna, Italy
Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA
LIP Coimbra, P-3004-516 Coimbra, Portugal
Niels Bohr Institutet, DK 2100 Copenhagen, Denmark
Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany
Joint Institute for Nuclear Research Dubna, 141980 Dubna, Moscow region, Russia
DESY, D-22603 Hamburg, Germany
Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany
Department of Physics, University of Houston, Houston, Texas 77204, USA
Institute for Nuclear Research, Ukrainian Academy of Science, 03680 Kiev, Ukraine
J. Stefan Institute, 1001 Ljubljana, Slovenia
University of Ljubljana, 1001 Ljubljana, Slovenia
University of California, Los Angeles, California 90024, USA
Lehrstuhl für Informatik V, Universität Mannheim, D-68131 Mannheim, Germany
University of Maribor, 2000 Maribor, Slovenia
Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia
Department of Physics, University of Oslo, N-0316 Oslo, Norway
Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany
Fachbereich Physik, Universität Siegen, D-57068 Siegen, Germany
Institute for Nuclear Research, INRNE-BAS, Sofia, Bulgaria
Universiteit Utrecht/NIKHEF, 3584 CB Utrecht, The Netherlands
DESY, D-15738 Zeuthen, Germany
Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
Dipartimento di Energetica dell' Università di Firenze and INFN Sezione di Bologna, Italy
Identifiers:DOI:10.1140/epjc/s10052-006-0139-9
ISSN:1434-6044 (Print) 1434-6052 (Online)
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