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

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Abstract

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.

Original languageEnglish
Article number052005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume73
Issue number5
DOIs
Publication statusPublished - 2006
Externally publishedYes

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