Charged particle cross sections in photoproduction and extraction of the gluon density in the photon

被引：30

作者：

Adloff, C ^{[1
]}

Anderson, M

Andreev, V

Andrieu, B

Arkadov, V

Arndt, C

Ayyaz, I

Babaev, A

Bähr, J

Bán, J

Baranov, P

Barrelet, E

Bartel, W

Bassler, U

Bate, P

Beck, M

Beglarian, A

Behnke, O

Behrend, HJ

Beier, C

Belousov, A

Berger, C

Bernardi, G

Bertrand-Coremans, G

Biddulph, P

Bizot, JC

Boudry, V

Braunschweig, W

Brisson, V

Brown, DP

Brückner, W

Bruel, P

Bruncko, D

Bürger, J

Büsser, FW

Buniatian, A

Burke, S

Buschhorn, G

Calvet, D

Campbell, AJ

Carli, T

Chabert, E

Charlet, M

Clarke, D

Clerbaux, B

Cocks, S

Contreras, JG

Cormack, C

Coughlan, JA

Cousinou, MC

机构：

[1] Berg Univ Wuppertal, Fachbereich Phys, Wuppertal, 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 & Space Res, Birmingham B15 2TT, W Midlands, England

[5] Free Univ Brussels, Interuniv Inst High Energies, Brussels, Belgium

[6] Univ Instelling Antwerp, B-2610 Antwerp, Belgium

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

[8] Inst Nucl Phys, Krakow, Poland

[9] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[10] Univ Calif Davis, IIRPA, Davis, CA 95616 USA

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

[12] Joint Inst Nucl Res, Dubna, Russia

[13] CEA Saclay, DSM, DAPNIA, F-91191 Gif Sur Yvette, France

[14] DESY, D-2000 Hamburg, Germany

[15] Univ Hamburg, Inst Expt Phys 2, D-2000 Hamburg, Germany

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

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

[18] Heidelberg Univ, Inst Hochenergiephys, D-6900 Heidelberg, Germany

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

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

[21] Univ Lancaster, Sch Phys & Chem, Lancaster, England

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

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

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

[25] Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England

[26] Univ Aix Marseille 2, CNRS, IN2P3, CPPM, F-13284 Marseille 07, France

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

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

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

[30] Univ Paris Sud, LAL, CNRS, IN2P3, Orsay, France

[31] Ecole Polytech, CNRS, IN2P3, LPNHE, F-91128 Palaiseau, France

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

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

[34] Acad Sci Czech Republ, Inst Phys, Prague, Czech Republic

[35] Charles Univ Prague, Nucl Ctr, Prague, Czech Republic

[36] Univ Roma 3, INFN Roma 1, Rome, Italy

[37] Univ Roma 3, Dipartimento Fis, Rome, Italy

[38] Paul Scherrer Inst, Villigen, Switzerland

[39] Inst Hochenergiephys, DESY, D-1615 Zeuthen, Germany

[40] Swiss Fed Inst Technol, Inst Teilchenphys, Zurich, Switzerland

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

[42] Humboldt Univ, Inst Phys, Berlin, Germany

[43] Berg Univ Wuppertal, Rechenzentrum, Wuppertal, Germany

[44] CINVESTAV, Dept Fis Ap, Merida, Yucatan, Mexico

来源：

EUROPEAN PHYSICAL JOURNAL C | 1999年 / 10卷 / 03期

关键词：

D O I：

10.1007/s100520050761

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：

Photoproduction data collected with the H1 detector at HERA in 1994 are used to study the cross-sections for inclusive charged particle production and the structure of the photon. The differential cross-sections d sigma/dp(T)(2), for /eta/ < 1 in the HERA laboratory frame, and d sigma/d eta for p(T) > 2 GeV/c and p(T) > 3 GeV/c have been measured. Model calculations of these cross-sections, based on perturbative QCD, indicate that the results are sensitive to the parton densities of the photon as well as to higher order effects, which are phenomenologically treated by multiple interactions. This sensitivity is exploited tc, determine the leading order x(gamma) distribution of partons in the photon using a new method based on high p(T) charged particles. The gluon content of the photon is extracted and found to rise with decreasing x(gamma).

引用

页码：363 / 372

页数：10

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