Measurement of charm and beauty dijet cross sections in photoproduction at HERA using the H1 vertex detector

被引：26

作者：

Aktas, A.

Andreev, V.

Anthonis, T.

Antunovic, B.

Aplin, S.

Asmone, A.

Astvatsatourov, A.

Babaev, A.

Backovic, S.

Baghdasaryan, A.

Baranov, P.

Barrelet, E.

Bartel, W.

Baudrand, S.

Baumgartner, S.

Becker, J.

Beckingham, M.

Behnke, O.

Behrendt, O.

Belousov, A.

Berger, N.

Bizot, J. C.

Boenig, M. -O.

Boudry, V.

Bracinik, J.

Brandt, G.

Brisson, V.

Bruncko, D.

Buesser, F. W.

Bunyatyan, A.

Buschhorn, G.

Bystritskaya, L.

Campbell, A. J.

Cassol-Brunner, F.

Cerny, K.

Cerny, V.

Chekelian, V.

Contreras, J. G.

Coughlan, J. A.

Cox, B. E.

Cozzika, G.

Cvach, J.

Dainton, J. B.

Dan, W. D.

Daum, K.

de Boer, Y.

Delcourt, B.

Del Degan, M.

De Roeck, A.

De Wolf, E. A.

机构：

[1] DESY, D-2000 Hamburg, Germany

[2] Rhein Westfal TH Aachen, Phys Inst 1, D-5100 Aachen, Germany

[3] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[4] Univ Antwerp, B-2020 Antwerp, Belgium

[5] Vrije Univ Brussel, ULB, Interuniv Inst High Energy Energies, Brussels, Belgium

[6] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[7] Inst Nucl Phys, Krakow, Poland

[8] Univ Dortmund, Inst Phys, D-4600 Dortmund, Germany

[9] Joint Inst Nucl Res, Dubna, Russia

[10] CE Saclay, CEA, DSM, DAPNIA, Gif Sur Yvette, France

[11] Univ Hamburg, Inst Expt Phys, Hamburg, Germany

[12] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[13] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany

[14] Heidelberg Univ, Kirchoff Inst Phys, D-6900 Heidelberg, Germany

[15] Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

[16] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia

[17] Univ Lancaster, Dept Phys, Lancaster LA1 4YW, England

[18] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[19] Queen Mary Univ London, London E1 4NS, England

[20] Lund Univ, Dept Phys, S-22100 Lund, Sweden

[21] Univ Manchester, Dept Phys, Manchester M13 9PL, Lancs, England

[22] Univ Aix Marseille 2, CPPM, CNRS, IN2P3, Marseille, France

[23] CINVESTAV, Dept Fis Aplicada, Merida, Yucatan, Mexico

[24] CINVESTAV, Dept Fis, Mexico City 14000, DF, Mexico

[25] Inst Theoret & Expt Phys, Moscow 117259, Russia

[26] PN Lebedev Phys Inst, Moscow 117924, Russia

[27] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[28] Univ Paris 11, LAL, IN2P3, CNRS, Orsay, France

[29] Ecole Polytech, LLR, IN2P3, CNRS, Palaiseau, France

[30] Univ Paris 06, LPNHE, IN2P3, CNRS, F-75252 Paris 05, France

[31] Univ Paris 07, LPNHE, IN2P3, CNRS, F-75221 Paris 05, France

[32] Univ Montenegro, Fac Sci, Podgorica, Montenegro

[33] Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic

[34] Charles Univ Prague, Fac Math & Phys, CR-11636 Prague 1, Czech Republic

[35] Univ Roma Tre, Dipartimento Fis, Rome, Italy

[36] Ist Nazl Fis Nucl, Rome, Italy

[37] Inst Nucl Energy Res, Sofia, Bulgaria

[38] Paul Scherrer Inst, Villigen, Switzerland

[39] Univ Gesamthsch Wuppertal, Fachbereich C, D-5600 Wuppertal, Germany

[40] Yerevan Phys Inst, Yerevan 375036, Armenia

[41] DESY, Zeuthen, Germany

[42] ETH, Inst Teilchenphys, Zurich, Switzerland

[43] Univ Zurich, Inst Phys, CH-8006 Zurich, Switzerland

[44] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[45] Berg Univ Wuppertal, Rechenzentrum, D-42097 Wuppertal, Germany

[46] Univ PJ Safarik, Kosice, Slovakia

[47] CERN, CH-1211 Geneva 23, Switzerland

[48] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[49] Comenius Univ, Bratislava 81806, Slovakia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2006年 / 47卷 / 03期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1140/epjc/s2006-02616-5

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A measurement of charm and beauty dijet photoproduction cross sections at the ep collider HERA is presented. Events are selected with two or more jets of transverse momentum Pt > 11(8) GeV in the central range of pseudo-rapidity -0.9 <eta (jet1(2))< 1.3. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the HI central vertex detector. Differential dijet cross sections for charm and beauty, and their relative contributions to the flavour inclusive dijet photoproduction cross section, are measured as a function of the transverse momentum of the leading jet, the average pseudorapidity of the two jets and the observable chi(obs)(gamma). Taking into account the theoretical uncertainties, the charm cross sections are consistent with a QCD calculation in next-to-leading order, while the predicted cross sections for beauty production are somewhat lower than the measurement.

引用

页码：597 / 610

页数：14

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