Observation of isolated high-ET photons in deep inelastic scattering

被引：29

作者：

Chekanov, S ^{[1
]}

Derrick, M

Loizides, JH

Magill, S

Miglioranzi, S

Musgrave, B

Repond, J

Yoshida, R

Mattingly, MCK

Pavel, N

Antonioli, P

Bari, G

Basile, A

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Romeo, GC

Cifarelli, L

Cindolo, F

Contin, A

Corradi, A

De Pasquale, S

Giusti, P

Iacobucci, G

Margotti, A

Montanari, A

Nania, R

Palmonari, F

Pesci, A

Rinaldi, L

Sartorelli, G

Zichichi, A

Aghuzumtsyan, G

Bartsch, D

Brock, I

Goers, S

Hartmann, H

Hilger, E

Irrgang, P

Jakob, HP

Kind, O

Meyer, U

Paul, E

Rautenberg, J

Renner, R

Stifutkin, A

Tandler, J

Voss, KC

Wang, M

机构：

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

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

[3] Humboldt Univ, Inst Phys, Berlin, Germany

[4] Univ Bologna, Bologna, Italy

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

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

[7] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TH, Avon, England

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

[9] Ist Nazl Fis Nucl, Cosenza, Italy

[10] Chonnam Natl Univ, Kwangju, South Korea

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

[12] Inst Nucl Phys, Krakow, Poland

[13] AGH Univ Sci & Technol, Fac Phys & Nucl Tech, Krakow, Poland

[14] Jagiellonian Univ, Dept Phys, PL-31007 Krakow, Poland

[15] DESY, Deutsch Elektron Synchrotron, D-2000 Hamburg, Germany

[16] DESY, Zeuthen, Germany

[17] Univ Florence, I-50121 Florence, Italy

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

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

[20] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[21] Univ Aegean, Dept Engn Management & Finance, Mitilini, Greece

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

[23] Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London SW7 2AZ, England

[24] Forschungszentrum Julich, Inst Kernphys, Julich, Germany

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

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

[27] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu, South Korea

[28] Catholic Univ Louvain, Inst Phys Nucl, B-1348 Louvain, Belgium

[29] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain

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

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

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

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

[34] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[35] NIKHEF, Amsterdam, Netherlands

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

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

[38] Univ Oxford, Dept Phys, Oxford OX1 2JD, England

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

[40] Ist Nazl Fis Nucl, Padua, Italy

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

[42] Polytech Univ, Sagamihara, Kanagawa, Japan

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

[44] Ist Nazl Fis Nucl, Rome, Italy

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

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

[47] Ewha Womans Univ, Dept Phys, Seoul, South Korea

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

[49] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan

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

来源：

PHYSICS LETTERS B | 2004年 / 595卷

关键词：

D O I：

10.1016/j.physletb.2004.05.033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb(-1). A signal for isolated photons in the transverse energy and rapidity ranges 5 < E-T(y) < 10 GeV and -0.7 < eta(gamma) < 0.9 was observed for virtualities of T the exchanged photon of Q(2) > 35 GeV2. Cross sections are presented for inclusive prompt photons and for those accompanied by a single jet in the range E-jet(T) greater than or equal to 6 GeV and 1.5 less than or equal to eta(jet) < 1.8. Calculations at order alpha(3)alpha(s), describe the data reasonably well. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：86 / 100

页数：15

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