Measurement of inclusive D*± and associated dijet cross sections in photoproduction at HERA

被引：97

作者：

Breitweg, J ^{[1
]}

Derrick, M

Krakauer, D

Magill, S

Mikunas, D

Musgrave, B

Repond, J

Stanek, I

Talaga, RL

Yoshida, I

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

Sartorelli, G

Garcia, YZ

Zichichi, A

Amelung, C

Bornheim, A

Frock, I

Coboken, K

Crittenden, J

Deffner, I

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, 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 USA

[11] Inst Phys Nucl, Krakow, Poland

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

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

[14] DESY, D-2000 Hamburg, Germany

[15] DESY, IFH, Zeuthen, Germany

[16] Univ Florence, I-50121 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 Exp 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, D-5170 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, Canada

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

[32] Moscow Phys Engn Inst, Moscow, Russia

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

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

[35] Univ Amsterdam, Amsterdam, Netherlands

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

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

[38] Ist Nazl Fis Nucl, Padua, Italy

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

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

[41] Polytech Univ, Sagamihara, Kanagawa, Japan

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

[43] Ist Nazl Fis Nucl, Rome, Italy

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

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

[46] Tel Aviv Univ, Sch Phys, Raymond & Beverly Sackler Fac Exact Sci, 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：

EUROPEAN PHYSICAL JOURNAL C | 1999年 / 6卷 / 01期

关键词：

D O I：

10.1007/s100520050322

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：

Inclusive photoproduction of D*(+/-) mesons has been measured for photon-proton centre-of-mass energies in the range 130 < W < 280GeV and photon virtuality Q(2) < 1 GeV2. The data sample used corresponds to an integrated luminosity of 37 pb(-1). Total and differential cross sections as functions of the D* transverse momentum and pseudorapidity are presented in restricted kinematical regions and the data are compared with next-to-leading order (NLO) perturbative QCD calculations using the "massive charm" and "massless charm" schemes. The measured cross sections are generally above the NLO calculations, in particular in the forward (proton) direction. The large data sample also allows the study of dijet production associated with charm. A significant resolved as well as a direct photon component contribute to the cross section. Leading order QCD Monte Carlo calculations indicate that the resolved contribution arises from a significant charm component in the photon. A massive charm NLO parton level calculation yields lower cross sections compared to the measured results in a kinematic region where the resolved photon contribution is significant.

引用

页码：67 / 83

页数：17

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