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Improved measurement of the bb̄ production cross section in 920 GeV fixed-target proton-nucleus collisions

  • I. Abt
  • , M. Adams
  • , M. Agari
  • , H. Albrecht
  • , A. Aleksandrov
  • , V. Amaral
  • , A. Amorim
  • , S. J. Aplin
  • , V. Aushev
  • , Y. Bagaturia
  • , V. Balagura
  • , M. Bargiotti
  • , O. Barsukova
  • , J. Bastos
  • , J. Batista
  • , C. Bauer
  • , Th S. Bauer
  • , A. Belkov
  • , Ar Belkov
  • , I. Belotelov
  • A. Bertin, B. Bobchenko, M. Böcker, A. Bogatyrev, G. Bohm, M. Bräuer, M. Bruinsma, M. Bruschi, P. Buchholz, T. Buran, J. Carvalho, P. Conde, C. Cruse, M. Dam, K. M. Danielsen, M. Danilov, S. De Castro, H. Deppe, X. Dong, H. B. Dreis, V. Egorytchev, K. Ehret, F. Eisele, D. Emeliyanov, S. Essenov, L. Fabbri, P. Faccioli, M. Feuerstack-Raible, J. Flammer, B. Fominykh, M. Funcke, Ll Garrido, A. Gellrich, B. Giacobbe, P. Giovannini, J. Gläß, D. Goloubkov, Y. Golubkov, A. Golutvin, I. Golutvin, I. Gorbounov, A. Gorišek, O. Gouchtchine, D. C. Goulart, S. Gradl, W. Gradl, F. Grimaldi, Yu Guilitsky, J. D. Hansen, J. M. Hernández, W. Hofmann, M. Hohlmann, T. Hott, W. Hulsbergen, U. Husemann, O. Igonkina, M. Ispiryan, T. Jagla, C. Jiang, H. Kapitza, S. Karabekyan, N. Karpenko, S. Keller, J. Kessler, F. Khasanov, Yu Kiryushin, I. Kisel, E. Klinkby, K. T. Knöpfle, H. Kolanoski, S. Korpar, C. Krauss, P. Kreuzer, P. Križan, D. Krücker, S. Kupper, T. Kvaratskheliia, A. Lanyov, K. Lau, B. Lewendel, T. Lohse, B. Lomonosov, R. Männer, R. Mankel, S. Masciocchi, I. Massa, I. Matchikhilian, G. Medin, M. Medinnis, M. Mevius, A. Michetti, Yu Mikhailov, R. Mizuk, R. Muresan, M. Zur Nedden, M. Negodaev, M. Nörenberg, S. Nowak, M. T. Núñez Pardo De Vera, M. Ouchrif, F. Ould-Saada, C. Padilla, D. Peralta, R. Pernack, R. Pestotnik, B. A.A. Petersen, M. Piccinini, M. A. Pleier, M. Poli, V. Popov, D. Pose, S. Prystupa, V. Pugatch, Y. Pylypchenko, J. Pyrlik, K. Reeves, D. Reßing, H. Rick, I. Riu, P. Robmann, I. Rostovtseva, V. Rybnikov, F. Sánchez, A. Sbrizzi, M. Schmelling, B. Schmidt, A. Schreiner, H. Schröder, U. Schwanke, A. J. Schwartz, A. S. Schwarz, B. Schwenninger, B. Schwingenheuer, F. Sciacca, N. Semprini-Cesari, S. Shuvalov, L. Silva, L. Sözüer, S. Solunin, A. Somov, S. Somov, J. Spengler, R. Spighi, A. Spiridonov, A. Stanovnik, M. Starič, C. Stegmann, H. S. Subramania, M. Symalla, I. Tikhomirov, M. Titov, I. Tsakov, U. Uwer, C. Van Eldik, Yu Vassiliev, M. Villa, A. Vitale, I. Vukotic, H. Wahlberg, A. H. Walenta, M. Walter, J. J. Wang, D. Wegener, U. Werthenbach, H. Wolters, R. Wurth, A. Wurz, Yu Zaitsev, M. Zavertyaev, T. Zeuner, A. Zhelezov, Z. Zheng, R. Zimmermann, T. Živko, A. Zoccoli
  • Max-Planck-Institut für Physik
  • University of Dortmund
  • Max-Planck-Institut für Kernphysik
  • c/o DESY
  • LIP Coimbra
  • Institute of Nuclear Research, National Academy of Sciences in Ukraine
  • High Energy Physics Institute
  • Institute for Theoretical and Experimental Physics
  • University of Bologna
  • Joint Institute for Nuclear Research, Dubna
  • Science Park 105
  • Universität Siegen
  • Universiteit Utrecht
  • University of Oslo
  • University of Barcelona
  • Niels Bohr Institutet
  • University of Heidelberg
  • Institute of High Energy Physics, Chinese Academy of Sciences
  • University of Mannheim
  • National Research Nuclear University MEPhI
  • Moscow State University
  • Department of Biochemistry and Molecular and Structural Biology
  • University of Cincinnati
  • Kurchatov Institute
  • University of Houston
  • Universität Rostock
  • Humboldt-Universität zu Berlin
  • University of Maribor
  • University of California, Los Angeles
  • University of Ljubljana
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • University of Florence
  • University of Zurich
  • Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
  • Tsinghua University

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

A new measurement of the bb̄ production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B Collaboration. The bb̄ production is tagged via inclusive bottom quark decays into J/ψ mesons by exploiting the longitudinal separation of J/ψ→l+l- decay vertices from the primary proton-nucleus interaction point. Both e+e- and μ+μ- channels are reconstructed for a total of 83±12 inclusive b→J/ψX events found. The combined analysis yields a bb̄ to prompt J/ψ cross section ratio of Δσ(bb̄)ΔσJ/ψ=0.032±0. 005stat±0.004sys measured in the xF acceptance (-0.35<xF<0.15), extrapolated to σ(bb̄)=14.9±2.2stat±2.4sysnb/nucleon in the total phase space.

langue originaleAnglais
Numéro d'article052005
journalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume73
Numéro de publication5
Les DOIs
étatPublié - 2006
Modification externeOui

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