Measurement of elastic Υ photoproduction at HERA

被引：128

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

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

Coboken, K

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] INFN Bologna, 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] Jagiellonian Univ, Dept Phys, Krakow, Poland

[13] DESY, D-2000 Hamburg, Germany

[14] DESY, IfH, Zeuthen, Germany

[15] Univ Florence, Florence, Italy

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

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

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

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

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

[21] Univ Hamburg, Inst Exp Phys 2, Hamburg, Germany

[22] Imperial Coll London, High Energy Nucl Phys Grp, London, England

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

[24] Forschungszentrum Julich, Inst Kernphys, D-5170 Julich, Germany

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

[26] Korea Univ, Seoul 136701, South Korea

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

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

[29] McGill Univ, Dept Phys, Montreal, 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] NIKHEF, 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] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys, IL-69978 Tel Aviv, Israel

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

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

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

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

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

来源：

PHYSICS LETTERS B | 1998年 / 437卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(98)01081-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The photoproduction reaction gamma p --> mu(+)mu(-) p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2 pb(-1). The Upsilon meson has been observed in photoproduction for the first time. The sum of the products of the elastic Upsilon(1S),Upsilon(2S),Upsilon(3S) photoproduction cross sections with their respective branching ratios is determined to be 13.3 +/- 6.0(stat.)(-2.3)(+2.7)(syst.) pb at a mean photon-proton centre of mass energy of 120 GeV. The cross section is above the prediction of a perturbative QCD model. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：432 / 444

页数：13

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