APS » Phys. Rev. D » Volume 73 » Issue 5

I. Abt,²³ M. Adams,¹⁰ M. Agari,¹³ H. Albrecht,¹² A. Aleksandrov,²⁹ V. Amaral,⁸ A. Amorim,⁸ S. J. Aplin,¹² V. Aushev,¹⁶ Y. Bagaturia,^12,36 V. Balagura,²² M. Bargiotti,⁶ O. Barsukova,¹¹ J. Bastos,⁸ J. Batista,⁸ C. Bauer,¹³ Th. S. Bauer,¹ A. Belkov,¹¹ Ar. Belkov,¹¹ I. Belotelov,¹¹ A. Bertin,⁶ B. Bobchenko,²² M. Böcker,²⁶ A. Bogatyrev,²² G. Bohm,²⁹ M. Bräuer,¹³ M. Bruinsma,^28,1 M. Bruschi,⁶ P. Buchholz,²⁶ T. Buran,²⁴ J. Carvalho,⁸ P. Conde,^2,12 C. Cruse,¹⁰ M. Dam,⁹ K. M. Danielsen,²⁴ M. Danilov,²² S. De Castro,⁶ H. Deppe,¹⁴ X. Dong,³ H. B. Dreis,¹⁴ V. Egorytchev,¹² K. Ehret,¹⁰ F. Eisele,¹⁴ D. Emeliyanov,¹² S. Essenov,²² L. Fabbri,⁶ P. Faccioli,⁶ M. Feuerstack-Raible,¹⁴ J. Flammer,¹² B. Fominykh,²² M. Funcke,¹⁰ Ll. Garrido,² A. Gellrich,²⁹ B. Giacobbe,⁶ P. Giovannini,⁶ J. Gläß,²⁰ D. Goloubkov,^12,33 Y. Golubkov,^12,34 A. Golutvin,²² I. Golutvin,¹¹ I. Gorbounov,^12,26 A. Gorisek,¹⁷ O. Gouchtchine,²² D. C. Goulart,⁷ S. Gradl,¹⁴ W. Gradl,¹⁴ F. Grimaldi,⁶ Yu. Guilitsky,^22,35 J. D. Hansen,⁹ J. M. Hernández,²⁹ W. Hofmann,¹³ M. Hohlmann,¹² T. Hott,¹⁴ W. Hulsbergen,¹ U. Husemann,²⁶ O. Igonkina,²² M. Ispiryan,¹⁵ T. Jagla,¹³ C. Jiang,³ H. Kapitza,¹² S. Karabekyan,²⁵ N. Karpenko,¹¹ S. Keller,²⁶ J. Kessler,¹⁴ F. Khasanov,²² Yu. Kiryushin,¹¹ I. Kisel,²³ E. Klinkby,⁹ K. T. Knöpfle,¹³ H. Kolanoski,⁵ S. Korpar,^21,17 C. Krauss,¹⁴ P. Kreuzer,^12,19 P. Krizan,^18,17 D. Krücker,⁵ S. Kupper,¹⁷ T. Kvaratskheliia,²² A. Lanyov,¹¹ K. Lau,¹⁵ B. Lewendel,¹² T. Lohse,⁵ B. Lomonosov,^12,32 R. Männer,²⁰ R. Mankel,²⁹ S. Masciocchi,¹² I. Massa,⁶ I. Matchikhilian,²² G. Medin,⁵ M. Medinnis,¹² M. Mevius,¹² A. Michetti,¹² Yu. Mikhailov,^22,35 R. Mizuk,²² R. Muresan,⁹ M. zur Nedden,⁵ M. Negodaev,^12,32 M. Nörenberg,¹² S. Nowak,²⁹ M. T. Núñez Pardo de Vera,¹² M. Ouchrif,^28,1 F. Ould-Saada,²⁴ C. Padilla,¹² D. Peralta,² R. Pernack,²⁵ R. Pestotnik,¹⁷ B. AA. Petersen,⁹ M. Piccinini,⁶ M. A. Pleier,¹³ M. Poli,^6,31 V. Popov,²² D. Pose,^11,14 S. Prystupa,¹⁶ V. Pugatch,¹⁶ Y. Pylypchenko,²⁴ J. Pyrlik,¹⁵ K. Reeves,¹³ D. Reßing,¹² H. Rick,¹⁴ I. Riu,¹² P. Robmann,³⁰ I. Rostovtseva,²² V. Rybnikov,¹² F. Sánchez,¹³ A. Sbrizzi,¹ M. Schmelling,¹³ B. Schmidt,¹² A. Schreiner,²⁹ H. Schröder,²⁵ U. Schwanke,²⁹ A. J. Schwartz,⁷ A. S. Schwarz,¹² B. Schwenninger,¹⁰ B. Schwingenheuer,¹³ F. Sciacca,¹³ N. Semprini-Cesari,⁶ S. Shuvalov,^22,5 L. Silva,⁸ L. Sözüer,¹² S. Solunin,¹¹ A. Somov,¹² S. Somov,^12,33 J. Spengler,¹³ R. Spighi,⁶ A. Spiridonov,^29,22 A. Stanovnik,^18,17 M. Staric,¹⁷ C. Stegmann,⁵ H. S. Subramania,¹⁵ M. Symalla,^12,10 I. Tikhomirov,²² M. Titov,²² I. Tsakov,²⁷ U. Uwer,¹⁴ C. van Eldik,^12,10 Yu. Vassiliev,¹⁶ M. Villa,⁶ A. Vitale,⁶ I. Vukotic,^5,29 H. Wahlberg,²⁸ A. H. Walenta,²⁶ M. Walter,²⁹ J. J. Wang,⁴ D. Wegener,¹⁰ U. Werthenbach,²⁶ H. Wolters,⁸ R. Wurth,¹² A. Wurz,²⁰ Yu. Zaitsev,²² M. Zavertyaev,^12,13,32 T. Zeuner,^12,26 A. Zhelezov,²² Z. Zheng,³ R. Zimmermann,²⁵ T. Zivko,¹⁷ and A. Zoccoli⁶

(HERA-B Collaboration)

¹NIKHEF, 1009 DB Amsterdam, The Netherlands
²Department ECM, Faculty of Physics, University of Barcelona, E-08028 Barcelona, Spain
³Institute for High Energy Physics, Beijing 100039, People's Republic of China
⁴Institute of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
⁵Institut für Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
⁶Dipartimento di Fisica dell' Università di Bologna and INFN Sezione di Bologna, I-40126 Bologna, Italy
⁷Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA
⁸LIP Coimbra, P-3004-516 Coimbra, Portugal
⁹Niels Bohr Institutet, DK 2100 Copenhagen, Denmark
¹⁰Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany
¹¹Joint Institute for Nuclear Research Dubna, 141980 Dubna, Moscow region, Russia
¹²DESY, D-22603 Hamburg, Germany
¹³Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany
¹⁴Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany
¹⁵Department of Physics, University of Houston, Houston, Texas 77204, USA
¹⁶Institute for Nuclear Research, Ukrainian Academy of Science, 03680 Kiev, Ukraine
¹⁷J. Stefan Institute, 1001 Ljubljana, Slovenia
¹⁸University of Ljubljana, 1001 Ljubljana, Slovenia
¹⁹University of California, Los Angeles, California 90024, USA
²⁰Lehrstuhl für Informatik V, Universität Mannheim, D-68131 Mannheim, Germany
²¹University of Maribor, 2000 Maribor, Slovenia
²²Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia
²³Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, D-80805 München, Germany
²⁴Department of Physics, University of Oslo, N-0316 Oslo, Norway
²⁵Fachbereich Physik, Universität Rostock, D-18051 Rostock, Germany
²⁶Fachbereich Physik, Universität Siegen, D-57068 Siegen, Germany
²⁷Institute for Nuclear Research, INRNE-BAS, Sofia, Bulgaria
²⁸Universiteit Utrecht/NIKHEF, 3584 CB Utrecht, The Netherlands
²⁹DESY, D-15738 Zeuthen, Germany
³⁰Physik-Institut, Universität Zürich, CH-8057 Zürich, Switzerland
³¹visitor from Dipartimento di Energetica dell' Università di Firenze and INFN Sezione di Bologna, Italy
³²visitor from P. N. Lebedev Physical Institute, 117924 Moscow B-333, Russia
³³visitor from Moscow Physical Engineering Institute, 115409 Moscow, Russia
³⁴visitor from Moscow State University, 119899 Moscow, Russia
³⁵visitor from Institute for High Energy Physics, Protvino, Russia
³⁶visitor from High Energy Physics Institute, 380086 Tbilisi, Georgia

A new measurement of the b[overline b] production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B Collaboration. The b[overline b] production is tagged via inclusive bottom quark decays into J/psi mesons by exploiting the longitudinal separation of J/psi-->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/psiX events found. The combined analysis yields a b[overline b] to prompt J/psi cross section ratio of ((Delta sigma(b[overline b]))/(Delta sigma[sub J/psi]))=0.032±0.005_stat±0.004_sys measured in the x_F acceptance (-0.35<x_F<0.15), extrapolated to nb/sigma(b[overline b])=14.9±2.2_stat±2.4_sys nucleon in the total phase space.

©2006 The American Physical Society

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