Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC

被引：10

作者：

Abelev, B. I. ^{[9
]}

Aggarwal, M. M. ^{[32
]}

Ahammed, Z. ^{[1
]}

Alakhverdyants, A. V. ^{[18
]}

Anderson, B. D. ^{[19
]}

Arkhipkin, D. ^{[4
]}

Averichev, G. S. ^{[18
]}

Badyal, S. K. ^{[17
]}

Balewski, J. ^{[23
]}

Barannikova, O. ^{[9
]}

Barnby, L. S. ^{[3
]}

Baudot, J. ^{[16
]}

Baumgart, S. ^{[53
]}

Beavis, D. R. ^{[4
]}

Bellwied, R.

Benedosso, F. ^{[28
,29
]}

Betancourt, M. J. ^{[23
]}

Betts, R. R. ^{[9
]}

Bhasin, A. ^{[17
]}

Bhati, A. K. ^{[32
]}

Bichsel, H. ^{[50
]}

Bielcik, J. ^{[11
]}

Bielcikova, J. ^{[12
]}

Biritz, B. ^{[7
]}

Bland, L. C. ^{[4
]}

Bnzarov, I. ^{[18
]}

Bombara, M. ^{[3
]}

Bonner, B. E. ^{[38
]}

Bouchet, J. ^{[19
]}

Braidot, E. ^{[28
,29
]}

Brandin, A. V. ^{[26
]}

Bruna, E. ^{[53
]}

Bueltmann, S. ^{[31
]}

Burton, T. P. ^{[3
]}

Bystersky, M. ^{[12
]}

Cai, X. Z. ^{[42
]}

Caines, H. ^{[53
]}

Calderon, M. ^{[6
]}

Catu, O. ^{[53
]}

Cebra, D. ^{[6
]}

Cendejas, R. ^{[7
]}

Cervantes, M. C. ^{[44
]}

Chajecki, Z. ^{[30
]}

Chaloupka, P. ^{[12
]}

Chattopadhyay, S. ^{[1
]}

Chen, H. F. ^{[40
]}

Chen, J. H. ^{[19
]}

Chen, J. Y. ^{[52
]}

Cheng, J. ^{[46
]}

Cherney, M. ^{[10
]}

机构：

[1] Variable Energy Cyclotron Ctr, Kolkata 700064, India

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

[3] Univ Birmingham, Birmingham, W Midlands, England

[4] Brookhaven Natl Lab, Upton, NY 11973 USA

[5] Univ Calif Berkeley, Berkeley, CA 94720 USA

[6] Univ Calif Davis, Davis, CA 95616 USA

[7] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[8] Univ Estadual Campinas, Sao Paulo, Brazil

[9] Univ Illinois, Chicago, IL 60607 USA

[10] Creighton Univ, Omaha, NE 68178 USA

[11] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic

[12] Acad Sci Czech Republic, Inst Nucl Phys, CZ-25068 Rez, Czech Republic

[13] Inst Phys, Bhubaneswar 751005, Orissa, India

[14] Indian Inst Technol, Bombay 400076, Maharashtra, India

[15] Indiana Univ, Bloomington, IN 47408 USA

[16] Histitut Rech Subat, Strasbourg, France

[17] Univ Jammu, Jammu 180001, India

[18] Joint Inst Nucl Res, Dubna 141980, Russia

[19] Kent State Univ, Kent, OH 44242 USA

[20] Univ Kentucky, Lexington, KY 40506 USA

[21] Inst Modern Phys, Lanzhou, Peoples R China

[22] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[23] MIT, Cambridge, MA 02139 USA

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

[25] Michigan State Univ, E Lansing, MI 48824 USA

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

[27] CUNY City Coll, New York, NY 10031 USA

[28] NIKHEF, Amsterdam, Netherlands

[29] Univ Utrecht, Amsterdam, Netherlands

[30] Ohio State Univ, Columbus, OH 43210 USA

[31] Old Dominion Univ, Norfolk, VA 23529 USA

[32] Panjab Univ, Chandigarh 160014, India

[33] Penn State Univ, University Pk, PA 16802 USA

[34] Inst High Energy Phys, Protvino, Russia

[35] Purdue Univ, W Lafayette, IN 47907 USA

[36] Pusan Natl Univ, Pusan 609735, South Korea

[37] Univ Rajasthan, Jaipur 302004, Rajasthan, India

[38] Rice Univ, Houston, TX 77251 USA

[39] Univ Sao Paulo, Sao Paulo, Brazil

[40] Univ Sci & Technol China, Hefei 230026, Peoples R China

[41] Shandong Univ, Jinan 250100, Peoples R China

[42] Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[43] SUBATECH, Nantes, France

[44] Texas A&M Univ, College Stn, TX 77843 USA

[45] Univ Texas Austin, Austin, TX 78712 USA

[46] Tsinghua Univ, Beijing 100084, Peoples R China

[47] USN Acad, Annapolis, MD 21402 USA

[48] Valparaiso Univ, Valparaiso, IN 46383 USA

[49] Warsaw Univ Technol, Warsaw, Poland

[50] Univ Washington, Seattle, WA 98195 USA

来源：

NUCLEAR PHYSICS A | 2010年 / 832卷 / 1-2期

基金：

英国工程与自然科学研究理事会; 巴西圣保罗研究基金会;

关键词：

Particle production; Photons; Forward rapidity; Limiting fragmentation; QUARK-GLUON PLASMA; NUCLEUS-NUCLEUS COLLISIONS; HEAVY-ION COLLISIONS; PLUS AU COLLISIONS; MULTIPLICITY; MATTER; COLLABORATION; PERSPECTIVE; CONDENSATE; DETECTOR;

D O I：

10.1016/j.nuclphysa.2009.11.011

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We present the multiplicity and pseudorapidity distributions of photons produced in Au + Au and Cu + Cu collisions at root(NN)-N-s = 62.4 and 200 GeV. The photons are measured in the region -3.7 < eta < -2.3 using the photon Multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent of (lie collision centrality. For collisions with similar average numbers of participating nucleons the photon multiplicities are observed to be similar for An + Au and Cu + Cu collisions at a given beam energy. The ratios of the number of charged particles to photons in the measured pseudorapidity range are found to be 1.4 +/- 0.1 and 1.2 +/- 0.1 for root(NN)-N-s = 62.4 and 200 GeV, respectively. The energy dependence of this ratio could reflect varying contributions from baryons to charged particles, while mesons are the dominant contributors to photon production in the given kinematic region. The photon pseudorapidity distributions normalized by average number of participating nucleon pairs, when plotted as a function of eta-Y-beam, are found to follow a longitudinal scaling independent of centrality and colliding ion species at both beam energies. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：134 / 147

页数：14

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