Measurement of prompt photon cross sections in photoproduction at HERA

被引：37

作者：

Aktas, A

Andreev, V

Anthonis, T

Asmone, A

Babaev, A

Backovic, S

Bähr, J

Baranov, P

Barrelet, E

Bartel, W

Baumgartner, S

Becker, J

Beckingham, M

Behnke, O

Behrendt, O

Belousov, A

Berger, C

Berger, N

Berndt, T

Bizot, JC

Böhme, J

Boenig, MO

Boudry, V

Bracinik, J

Brisson, V

Bröker, HB

Brown, DP

Bruncko, D

Büsser, FW

Bunyatyan, A

Buschhorn, G

Bystritskaya, L

Campbell, AJ

Caron, S

Cassol-Brunner, F

Cerny, K

Chekelian, V

Collard, C

Contreras, JG

Coppens, YR

Coughlan, JA

Cox, BE

Cozzika, G

Cvach, J

Dainton, JB

Dau, WD

Daum, K

Delcourt, B

Demirchyan, R

De Roeck, A

机构：

[1] DESY, D-2000 Hamburg, Germany

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

[3] Rhein Westfal TH Aachen, Inst Phys 3, D-5100 Aachen, Germany

[4] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[5] ULB VUB, Interuniv Inst High Energies, Brussels, Belgium

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

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

[8] Inst Nucl Phys, Krakow, Poland

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

[10] Joint Inst Nucl Res, Dubna, Russia

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

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

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

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

[15] Heidelberg Univ, Kirchhoff Inst Phys, Heidelberg, Germany

[16] Univ Kiel, Inst Expt & Angew Phys, Kiel, Germany

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

[18] Univ Lancaster, Dept Phys, Lancaster, England

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

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

[21] Lund Univ, Dept Phys, Lund, Sweden

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

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

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

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

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

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

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

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

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

[31] Univ Paris 06, LPNHE, CNRS, IN2P3, Paris, France

[32] Univ Paris 07, LPNHE, CNRS, IN2P3, Paris, France

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

[34] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

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

[36] INFN Roma 3, Rome, Italy

[37] Paul Scherrer Inst, Villigen, Switzerland

[38] Berg Univ Wuppertal, Fachbereich Phys, Wuppertal, Germany

[39] Yerevan Phys Inst, Yerevan 375036, Armenia

[40] DESY, Zeuthen, Germany

[41] ETH, Inst Teilchenphys, Zurich, Switzerland

[42] Univ Zurich, Inst Phys, Zurich, Switzerland

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

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

[45] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany

[46] Safarik Univ, Kosice, Slovakia

[47] CERN, Geneva, Switzerland

来源：

EUROPEAN PHYSICAL JOURNAL C | 2005年 / 38卷 / 04期

关键词：

D O I：

10.1140/epjc/s2004-02085-x

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：

Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the gammap center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 < E. T < 10 GeV and for associated jets with E-T(jet) > 4.5 GeV. They are measured differentially as a function of E-T(gamma), E-T(jet), the pseudorapidities eta(gamma) and eta(jet) and estimators of the momentum fractions x(gamma) and x(p) of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented.

引用

页码：437 / 445

页数：9

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