Measurement of jet shapes in photoproduction at HERA

被引：38

作者：

Breitweg, J

Derrick, M

Krakauer, D

Magill, S

Mikunas, D

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

Corradi, M

De Pasquale, S

Gialas, I

Giusti, P

Iacobucci, G

Laurenti, G

Levi, G

Margotti, A

Massam, T

Nania, R

Palmonari, F

Pesci, A

Polini, A

Ricci, F

Sartorelli, G

Garcia, YZ

Zichichi, A

Amelung, C

Bornheim, A

Brock, I

Coboken, K

Crittenden, J

Deffner, R

Eckert, M

Grothe, M

机构：

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

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

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

[4] Univ Bologna, 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 Nucl Phys, 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, Zeuthen, Germany

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

[17] Univ Florence, I-50121 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 2, Hamburg, Germany

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

[23] Imperial Coll London, 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] 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 Nucl Phys, Moscow, Russia

[33] Univ Amsterdam, NL-1012 WX Amsterdam, Netherlands

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

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

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

[37] Univ Padua, Dipartimento Fis, I-35100 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] Ist Nazl Fis Nucl, I-10125 Turin, Italy

[50] Univ Turin, Dipartimento Fis Sperimentale, I-10124 Turin, Italy

来源：

EUROPEAN PHYSICAL JOURNAL C | 1998年 / 2卷 / 01期

关键词：

D O I：

10.1007/s100520050124

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 shape of jets produced in quasi-real photon-proton collisions at centre-of-mass energies in the range 134-277 GeV has been measured using the hadronic energy flow. The measurement was done with the ZEUS detector at HERA. Jets are identified using a cone algorithm in the eta - phi plane with a cone radius of one unit. Measured jet shapes both in inclusive jet and dijet production with transverse energies E-T(jet) > 14 GeV are presented. The jet shape broadens as the jet pseudorapidity (eta(jet)) increases and narrows as E-T(jet) increases. In dijet photoproduction, the jet shapes have been measured separately for samples dominated by resolved and by direct processes, Leading-logarithm parton-shower Monte Carlo calculations of resolved and direct processes describe well the measured jet shapes except for the inclusive production of jets with high eta(jet) and low E-T(jet). The observed broadening of the jet shape as eta(jet) increases is consistent with the predicted increase in the fraction of final state gluon jets.

引用

页码：61 / 75

页数：15

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