Dijet photoproduction at HERA and the structure of the photon

被引：70

作者：

Chekanov, S

Derrick, M

Krakauer, D

Magill, S

Musgrave, B

Pellegrino, A

Repond, J

Yoshida, R

Mattingly, MCK

Antonioli, P

Bari, G

Basile, M

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Romeo, GC

Cifarelli, L

Cindolo, F

Contin, A

Corradi, M

De Pasquale, S

Giusti, P

Iacobucci, G

Levi, G

Margotti, A

Massam, T

Nania, R

Palmonari, F

Pesci, A

Sartorelli, G

Zichichi, A

Aghuzumtsyan, G

Bartsch, D

Brock, I

Crittenden, J

Goers, S

Hartmann, H

Hilger, E

Irrgang, P

Jakob, HP

Kappes, A

Katz, UF

Kerger, R

Kind, O

Paul, E

Rautenberg, J

Renner, R

Schnurbusch, H

Stifutkin, A

机构：

[1] Argonne Natl Lab, Argonne, IL 60439 USA

[2] Andrews Univ, Berrien Springs, MI 49104 USA

[3] Univ Bologna, Bologna, Italy

[4] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[5] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

[6] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[7] Univ Calabria, Dept Phys, I-87036 Cosenza, Italy

[8] Ist Nazl Fis Nucl, Cosenza, Italy

[9] Chonnam Natl Univ, Kwangju, South Korea

[10] Columbia Univ, Nevis Labs, Irvington, NY 10027 USA

[11] Inst Nucl Phys, Krakow, Poland

[12] Univ Min & Met Krakow, Fac Phys & Nucl Techniques, Krakow, Poland

[13] Jagiellonian Univ, Dept Phys, Krakow, Poland

[14] DESY, D-2000 Hamburg, Germany

[15] DESY Zeuthen, Zeuthen, Germany

[16] Univ Florence, Florence, Italy

[17] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[18] Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany

[19] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

[20] Univ Hamburg, Inst Expt Phys 1, Hamburg, Germany

[21] Univ Hamburg, Inst Expt Phys 2, Hamburg, Germany

[22] Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England

[23] Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany

[24] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan

[25] Minist Educ & Sci Kazakhstan, Inst Phys & Technol, Alma Ata, Kazakhstan

[26] Korea Univ, Seoul 136701, South Korea

[27] Kyungpook Natl Univ, Taegu 702701, South Korea

[28] Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain

[29] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[30] Meiji Gakuin Univ, Fac Gen Educ, Yokohama, Kanagawa, Japan

[31] Moscow MV Lomonosov State Univ, Inst Phys Nucl, Moscow, Russia

[32] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[33] Univ Amsterdam, Amsterdam, Netherlands

[34] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[35] Univ Oxford, Dept Phys, Oxford, England

[36] Univ Padua, Dipartimento Fis, Padua, Italy

[37] Ist Nazl Fis Nucl, Padua, Italy

[38] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[39] Polytech Univ, Sagamihara, Kanagawa, Japan

[40] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[41] Ist Nazl Fis Nucl, Rome, Italy

[42] Rutherford Appleton Lab, Didcot, Oxon, England

[43] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[44] Seoul Natl Univ, Seoul, South Korea

[45] Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany

[46] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel

[47] Tokyo Metropolitan Univ, Dept Phys, Tokyo, Japan

[48] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[49] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy

[50] Ist Nazl Fis Nucl, I-10125 Turin, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 2002年 / 23卷 / 04期

关键词：

D O I：

10.1007/s100520200936

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：

The dijet cross section in photoproduction ha's been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV2 and a photon-proton centre-of-mass energy in the range 131 < W-yp < 277 GeV. Each event contains at least two jets satisfying transverse-energy requirements of E-T(jet1) > 14 GeV and E-T(jet2) > 11 GeV and pseudorapidity requirements of -1 < eta(jet1,2) < 2.4. The measurements arc compared to next-to-loading-order QCD predictions. The data show particular sensitivity to the density of partons in the photon, allowing the validity of the current parameterisations to be tested.

引用

页码：615 / 631

页数：17

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