Improved Measurement of the b-bbar Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions

Abt, I.; Adams, M.; Agari, M.; Albrecht, H.; Aleksandrov, A.; Amaral, V.; Amorim, A.; Aplin, S. J.; Aushev, V.; Bagaturia, Y.; Balagura, V.; Bargiotti, M.; Barsukova, O.; Bastos, J.; Batista, J.; Bauer, C.; Bauer, T. H. S.; Belkov, A.; Belkov, A. R.; Belotelov, I.; Bertin, Antonio; Bobchenko, B.; Bocker, M.; Bogatyrev, A.; Bohm, G.; Brauer, M.; Bruinsma, M.; Bruschi, M.; Buchholz, P.; Buran, T.; Carvalho, J.; Conde, P.; Cruse, C.; Dam, M.; Danielsen, K. M.; Danilov, M.; DE CASTRO, Stefano; Deppe, H.; Dong, X.; Dreis, H. B.; Egorytchev, V.; Ehret, K.; Eisele, F.; Emeliyanov, D.; Essenov, S.; Fabbri, Laura; Faccioli, Pietro; FEUERSTACK RAIBLE, M.; Flammer, J.; Fominykh, B.; Funcke, M.; Garrido, L. L.; Gellrich, A.; Giacobbe, B.; Giovannini, Paola; Glass, J.; Goloubkov, D.; Golubkov, Y.; Golutvin, A.; Golutvin, I.; Gorbounov, I.; Gorisek, A.; Gouchtchine, O.; Goulart, D. C.; Gradl, S.; Gradl, W.; Grimaldi, F.; Guilitsky, Y. U.; Hansen, J. D.; Hernandez, J. M.; Hofmann, W.; Hohlmann, M.; Hott, T.; Hulsbergen, W.; Husemann, U.; Igonkina, O.; Ispiryan, M.; Jagla, T.; Jiang, C.; Kapitza, H.; Karabekyan, S.; Karpenko, N.; Keller, S.; Kessler, J.; Khasanov, F.; Kiryushin, Y. U.; Kisel, I.; Klinkby, E.; Knopfle, K. T.; Kolanoski, H.; Korpar, S.; Krauss, C.; Kreuzer, P.; Krizan, P.; Krucker, D.; Kupper, S.; Kvaratskheliia, T.; Lanyov, A.; Lau, K.; Lewendel, B.; Lohse, T.; Lomonosov, B.; Manner, R.; Mankel, R.; Masciocchi, S.; Massa, IGNAZIO GIACOMO; Matchikhilian, I.; Medin, G.; Medinnis, M.; Mevius, M.; Michetti, A.; Mikhailov, Y. U.; Mizuk, R.; Muresan, R.; ZUR NEDDEN, M.; Negodaev, M.; Norenberg, M.; Nowak, S.; NUNEZ PARDO DE VERA, M. T.; Ouchrif, M.; OULD SAADA, F.; Padilla, C.; Peralta, D.; Pernack, R.; Pestotnik, R.; Petersen, B. A. A.; Piccinini, Maurizio; Pleier, M. A.; Poli, M.; Popov, V.; Pose, D.; Prystupa, S.; Pugatch, V. M.; Pylypchenko, Y.; Pyrlik, J.; Reeves, K.; Reing, D.; Rick, H.; Riu, I.; Robmann, P.; Rostovtseva, I.; Rybnikov, V.; Sanchez, F.; Sbrizzi, Antonio; Schmelling, M.; Schmidt, B.; Schreiner, A.; Schroder, H.; Schwanke, U.; Schwartz, ALAN J.; Schwarz, ANDREAS S.; Schwenninger, B.; Schwingenheuer, B.; Sciacca, F.; SEMPRINI CESARI, Nicola; Shuvalov, S.; Silva, L.; Sozuer, L.; Solunin, S.; Somov, A.; Somov, S.; Spengler, J.; Spighi, R.; Spiridonov, A.; Stanovnik, A.; Staric, M.; Stegmann, C.; Subramania, H. S.; Symalla, M.; Tikhomirov, I.; Titov, M.; Tsakov, I.; Uwer, U.; VAN ELDIK, C.; Vassiliev, Y. U.; Villa, Mauro; Vitale, Antonio; Vukotic, I.; Wahlberg, H.; Walenta, A. H.; Walter, M.; Wang, J. J.; Wegener, D.; Werthenbach, U.; Wolters, H.; Wurth, R.; Wurz, A.; Zaitsev, Y. U.; Zavertyaev, M.; Zeuner, T.; Zhelezov, A.; Zheng, Z.; Zimmermann, R.; Zivko, T.; Zoccoli, Antonio

doi:10.1103/PhysRevD.73.052005

A new measurement of the b-bbar production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B collaboration. The b-bbar production is tagged via inclusive bottom quark decays into J/psi mesons, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus interaction point. Both e+e- and mu+mu- channels are reconstructed, for a total of 83 +- 12 inclusive b->J/psi X events found. The combined analysis yields a b-bbar to prompt J/psi cross section ratio of {frac{{Deltasigma(bbbar)}}{{Deltasigma_{jpsi}}}} = 0.032pm 0.005 stat pm 0.004 sys measured in the x_f acceptance (-0.35 <x_f <0.15), extrapolated to sigma(bbbar) = 14.9 pm 2.2 stat pm 2.4 sys nb/nucleon in the total phase space.

I. ABT, M. ADAMS, M. AGARI, H. ALBRECHT, A. ALEKSANDROV, V. AMARAL, et al. (2006). Improved Measurement of the b-bbar Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 73, 052005-1-052005-17 [10.1103/PhysRevD.73.052005].