Measurement of inclusive prompt photon photoproduction at HERA

被引：56

作者：

Breitweg, J

Chekanov, S

Derrick, M

Krakauer, D

Magill, S

Musgrave, B

Pellegrino, A

Repond, J

Stanek, R

Yoshida, R

Mattingly, MCK

Abbiendi, G

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

Sartorelli, G

Garcia, YZ

Zichichi, A

Amelung, C

Bornheim, A

Brock, I

Coböken, K

Crittenden, J

Deffner, R

Hartmann, H

Heinloth, K

Hilger, E

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, I-87036 Cosenza, Italy

[9] Chonnam Natl Univ, Kwangju, South Korea

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

[11] Inst Nucl Phys, Krakow, Poland

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

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

[14] DESY, D-2000 Hamburg, Germany

[15] DESY, 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, D-7800 Freiburg, Germany

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

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

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

[23] Univ London 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, Inst Kernphys, Julich, Germany

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

[27] Korea Univ, Seoul 136701, South Korea

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

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

[30] McGill Univ, Dept Phys, Montreal, PQ H3A 2T5, Canada

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

[32] Moscow MV Lomonosov State Univ, Inst Nucl Phys, 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 OX11 0QX, Oxon, England

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

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

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

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

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

来源：

PHYSICS LETTERS B | 2000年 / 472卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(99)01450-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb(-1) Cross sections are given as a funct ion of the pseudorapidity and the transverse energy (eta(gamma) , E-T(gamma)) of the photon for E-1(gamma) > 5 GeV in thr gamma p centre-of-mass energy ranee 133-285 GeV. Comparisons are made with predictions from Monte Carlo models having Icading-logarithm pal-ton showers, and with next-to-leading-order QCD calculations, using currently available parameterisations of the photon structure. For forward eta(gamma) (proton direction) good agreement is found, but in the rear direction all predictions fall below the data. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

引用

页码：175 / 188

页数：14

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