Diffractive dijet cross sections in photoproduction at HERA

被引：42

作者：

Breitweg, J

Derrick, M

Krakauer, D

Magill, S

Mikunas, T

Musgrave, B

Repond, J

Stanek, R

Talaga, RL

Yoshida, R

Zhang, H

Mattingly, MCK

Anselmo, F

Antonioli, P

Bari, G

Basile, M

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Romeo, GC

Castellini, G

Cifarelli, L

Cindolo, F

Contin, A

Coppola, N

Corradi, M

De Pasquale, S

Giusti, P

Iacobucci, G

Laurenti, G

Levi, G

Margotti, A

Massam, T

Nania, R

Palmonari, F

Pesci, A

Polini, A

Satorelli, G

Garcia, YZ

Zichichi, A

Amelung, C

Bornheim, A

Brock, I

Coboken, E

Crittenden, J

Deffner, R

Eckert, M

Grothe, M

Hartmann, H

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, Bonn, Germany

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

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

[8] INFN, Cosenza, Italy

[9] Chonnam Natl Univ, Kwangju, South Korea

[10] Columbia Univ, Nevis Labs, Irvington, NY 10533 USA

[11] Inst Nucl Phys, Krakow, Poland

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

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

[14] DESY, Deutsch Elektronen Synchrotron, Hamburg, Germany

[15] DESY, IfH Zeuthen, Zeuthen, Germany

[16] Univ Florence, Florence, Italy

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

[18] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[19] Univ Freiburg, Fak Phys, Freiburg, Germany

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

[21] Univ Hamburg, Inst Exp Phys 1, Hamburg, Germany

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

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

[24] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[25] Forschungszentrum Julich, Julich, Germany

[26] Natl Lab High Energy Phys, KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 305, Japan

[27] Korea Univ, Seoul 136701, South Korea

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

[29] McGill Univ, Dept Phys, Quebec City, PQ, Canada

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

[31] Moscow Engn Phys Inst, Moscow 115409, Russia

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

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

[34] Univ Amsterdam, Amsterdam, Netherlands

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

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

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

[38] Ist Nazl Fis Nucl, Padua, Italy

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

[40] Polytech Univ, Sagamihara, Kanagawa, Japan

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

[42] Ist Nazl Fis Nucl, Rome, Italy

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

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

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

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

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

[48] Ist Nazl Fis Nucl, Turin, Italy

[49] Univ Turin, Fac Sci 2, Alessandria, Italy

[50] INFN, Alessandria, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 1998年 / 5卷 / 01期

关键词：

D O I：

10.1007/s100520050246

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：

Differential dijet cross sections have been measured with the ZEUS detector for photoproduction events in which the hadronic final state containing the jets is separated with respect to the outgoing proton direction by a large rapidity gap. The cross section has been measured as a function of the fraction of the photon (x(gamma)(OBS)) and pomeron (beta(OBS)) momentum participating in the production of the dijet system. The observed x(gamma)(OBS) dependence shows evidence for the presence of a resolved- as well as a direct-photon component. The measured cross section d sigma/d beta(OBS) increases as beta(OBS) increases indicating that there is a sizeable contribution to dijet production from those events in which a large fraction of the pomeron momentum participates in the hard scattering. These cross sections and the ZEUS measurements of the diffractive structure function carl be described by calculations ba-sed on parton densities ill the pomeron which evolve according to the QCD evolution equations and include a substantial hard momentum component of gluons in the pomeron.

引用

页码：41 / 56

页数：16

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