Measurement of open beauty production at HERA

被引:112
作者
Adloff, C [1 ]
Andreev, V
Andrieu, B
Arkadov, A
Astvatsatourov, A
Ayyaz, I
Babaev, A
Bähr, J
Baranov, P
Barrelet, E
Bartel, W
Bassler, U
Bate, P
Beglarian, A
Behnke, O
Beier, C
Belousov, A
Benisch, T
Berger, C
Bernardi, G
Berndt, T
Bertrand-Coremans, G
Biddulph, P
Bizot, JC
Boudry, V
Braunschweig, W
Brisson, V
Bröker, HB
Brown, DP
Brückner, W
Bruel, P
Bruncko, D
Bürger, J
Büsser, FW
Bunyatyan, A
Burke, S
Burrage, A
Buschhorn, G
Calvet, D
Campbell, AJ
Cao, J
Carli, T
Chabert, E
Charlet, M
Clarke, D
Clerbaux, B
Collard, C
Contreras, JG
Coughlan, JA
Cousinou, MC
机构
[1] Berg Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany
[2] DESY, Zeuthen, Germany
[3] Swiss Fed Inst Technol, Inst Teilchenphys, Zurich, Switzerland
[4] Univ Zurich, Inst Phys, Zurich, Switzerland
[5] Humboldt Univ, Inst Phys, Berlin, Germany
[6] Rhein Westfal TH Aachen, Inst Phys 1, D-5100 Aachen, Germany
[7] Rhein Westfal TH Aachen, Inst Phys 3, D-5100 Aachen, Germany
[8] Univ Birmingham, Sch Phys & Space Res, Birmingham, W Midlands, England
[9] Univ Instelling Antwerp, B-2610 Antwerp, Belgium
[10] VUB, ULB, Inter Univ Inst High Energies, Brussels, Belgium
[11] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[12] Inst Nucl Phys, Krakow, Poland
[13] Univ Dortmund, Inst Phys, D-4600 Dortmund, Germany
[14] Joint Nucl Res Inst, Dubna, Russia
[15] CEA, DAPNIA, DSM, Gif Sur Yvette, France
[16] DESY, D-2000 Hamburg, Germany
[17] Univ Hamburg, Inst Expt Phys 2, Hamburg, Germany
[18] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[19] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany
[20] Heidelberg Univ, Inst Hochenergiephys, Heidelberg, Germany
[21] Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany
[22] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia
[23] Univ Lancaster, Sch Phys & Chem, Lancaster, England
[24] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
[25] Queen Mary Univ London, London E1 4NS, England
[26] Lund Univ, Dept Phys, Lund, Sweden
[27] Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England
[28] Univ Aix Marseille 2, CPPM, IN2P3, CNRS, F-13284 Marseille 07, France
[29] Inst Theoret & Expt Phys, Moscow 117259, Russia
[30] Lebedev Phys Inst, Moscow, Russia
[31] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[32] Univ Paris 11, LAL, IN2P3, CNRS, Orsay, France
[33] IN2P3, Ecole Polytech, LPNHE, CNRS, Palaiseau, France
[34] Univ Paris 06, LPNHE, IN2P3, CNRS, Paris, France
[35] Univ Paris 07, LPNHE, IN2P3, CNRS, Paris, France
[36] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic
[37] Charles Univ Prague, Nucl Ctr, Prague, Czech Republic
[38] Univ Roma 3, Ist Nazl Fis Nucl, Rome, Italy
[39] Univ Roma 3, Dipartimento Fis, Rome, Italy
[40] Paul Scherrer Inst, Villigen, Switzerland
[41] CINVESTAV, Dept Fis Aplicada, Merida, Mexico
[42] Berg Univ Wuppertal, Rechenzentrum, Wuppertal, Germany
[43] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany
[44] Univ PJ Safarik, SK-04154 Kosice, Slovakia
关键词
D O I
10.1016/S0370-2693(99)01099-0
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The first observation of open b production in ep collisions is reported. An event sample containing muons and jets has been selected which is enriched in semileptonic b quark decays. The visible cross section sigma(ep --> b (b) over bar X --> mu X') for Q(2) < 1 GeV2, 0.1 < y < 0.8 is measured to be 0.176 +/- 0.016(stat.)(+0.026)(-0.017)(syst.) nb for the muons to be detected in the range 35 degrees < theta(mu) < 130 degrees and p(perpendicular to)(mu) > 2.0GeV in the laboratory frame. The expected visible cross section based on a NLO QCD calculation is 0.104 +/- 0.017nb. The cross sections for electroproduction with Q(2) < 1GeV(2) and photoproduction are derived from the data and found to be sigma(ep --> eb (b) over bar X) = 7.1 +/- 0.6(stat.)(-1.3)(+1.5)(syst.)nb and sigma(gamma p --> b (b) over bar X) = 111+/- 10(stat.)(-20)(+23) (syst.) nb at an average [W-gamma p] similar to 180GeV, respectively. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:156 / 164
页数:9
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