Phys. Rev. Lett. 95, 062301 (2005) [6 pages]
Multiplicity and Pseudorapidity Distributions of Photons in Au+Au Collisions at sqrt[sNN]=62.4 GeV
J. Adams et al. STAR Collaboration
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J. Adams3, M. M. Aggarwal29, Z. Ahammed43, J. Amonett20, B. D. Anderson20, D. Arkhipkin13, G. S. Averichev12, S. K. Badyal19, Y. Bai27, J. Balewski17, O. Barannikova32, L. S. Barnby3, J. Baudot18, S. Bekele28, V. V. Belaga12, A. Bellingeri-Laurikainen38, R. Bellwied46, J. Berger14, B. I. Bezverkhny48, S. Bhardwaj33, A. Bhasin19, A. K. Bhati29, H. Bichsel45, J. Bielcik48, J. Bielcikova48, A. Billmeier46, L. C. Bland4, C. O. Blyth3, S. Blyth21, B. E. Bonner34, M. Botje27, A. Boucham38, J. Bouchet38, A. V. Brandin25, A. Bravar4, M. Bystersky11, R. V. Cadman1, X. Z. Cai37, H. Caines48, M. Calderón de la Barca Sánchez17, J. Castillo21, O. Catu48, D. Cebra7, Z. Chajecki44, P. Chaloupka11, S. Chattopadhyay43, H. F. Chen36, Y. Chen8, J. Cheng41, M. Cherney10, A. Chikanian48, W. Christie4, J. P. Coffin18, T. M. Cormier46, M. R. Cosentino35, J. G. Cramer45, H. J. Crawford6, D. Das43, S. Das43, M. M. de Moura35, T. G. Dedovich12, A. A. Derevschikov31, L. Didenko4, T. Dietel14, S. M. Dogra19, W. J. Dong8, X. Dong36, J. E. Draper7, F. Du48, A. K. Dubey15, V. B. Dunin12, J. C. Dunlop4, M. R. Dutta Mazumdar43, V. Eckardt23, W. R. Edwards21, L. G. Efimov12, V. Emelianov25, J. Engelage6, G. Eppley34, B. Erazmus38, M. Estienne38, P. Fachini4, J. Faivre18, R. Fatemi17, J. Fedorisin12, K. Filimonov21, P. Filip11, E. Finch48, V. Fine4, Y. Fisyak4, K. S. F. Fornazier35, J. Fu41, C. A. Gagliardi39, L. Gaillard3, J. Gans48, M. S. Ganti43, F. Geurts34, V. Ghazikhanian8, P. Ghosh43, J. E. Gonzalez8, H. Gos44, O. Grachov46, O. Grebenyuk27, D. Grosnick42, S. M. Guertin8, Y. Guo46, A. Gupta19, T. D. Gutierrez7, T. J. Hallman4, A. Hamed46, D. Hardtke21, J. W. Harris48, M. Heinz2, T. W. Henry39, S. Hepplemann30, B. Hippolyte18, A. Hirsch32, E. Hjort21, G. W. Hoffmann40, M. Horner21, H. Z. Huang8, S. L. Huang36, E. W. Hughes5, T. J. Humanic28, G. Igo8, A. Ishihara40, P. Jacobs21, W. W. Jacobs17, M Jedynak44, H. Jiang8, P. G. Jones3, E. G. Judd6, S. Kabana2, K. Kang41, M. Kaplan9, D. Keane20, A. Kechechyan12, V. Yu. Khodyrev31, J. Kiryluk22, A. Kisiel44, E. M. Kislov12, J. Klay21, S. R. Klein21, D. D. Koetke42, T. Kollegger14, M. Kopytine20, L. Kotchenda25, K. L. Kowalik21, M. Kramer26, P. Kravtsov25, V. I. Kravtsov31, K. Krueger1, C. Kuhn18, A. I. Kulikov12, A. Kumar29, R. Kh. Kutuev13, A. A. Kuznetsov12, M. A. C. Lamont48, J. M. Landgraf4, S. Lange14, F. Laue4, J. Lauret4, A. Lebedev4, R. Lednicky12, S. Lehocka12, M. J. LeVine4, C. Li36, Q. Li46, Y. Li41, G. Lin48, S. J. Lindenbaum26, M. A. Lisa28, F. Liu47, H. Liu36, J. Liu34, L. Liu47, Q. J. Liu45, Z. Liu47, T. Ljubicic4, W. J. Llope34, H. Long8, R. S. Longacre4, M. Lopez-Noriega28, W. A. Love4, Y. Lu47, T. Ludlam4, D. Lynn4, G. L. Ma37, J. G. Ma8, Y. G. Ma37, D. Magestro28, S. Mahajan19, D. P. Mahapatra15, R. Majka48, L. K. Mangotra19, R. Manweiler42, S. Margetis20, C. Markert20, L. Martin38, J. N. Marx21, H. S. Matis21, Yu. A. Matulenko31, C. J. McClain1, T. S. McShane10, F. Meissner21, Yu. Melnick31, A. Meschanin31, M. L. Miller22, N. G. Minaev31, C. Mironov20, A. Mischke27, D. K. Mishra15, J. Mitchell34, B. Mohanty43, L. Molnar32, C. F. Moore40, D. A. Morozov31, M. G. Munhoz35, B. K. Nandi16, S. K. Nayak19, T. K. Nayak43, J. M. Nelson3, P. K. Netrakanti43, V. A. Nikitin13, L. V. Nogach31, S. B. Nurushev31, G. Odyniec21, A. Ogawa4, V. Okorokov25, M. Oldenburg21, D. Olson21, S. K. Pal43, Y. Panebratsev12, S. Y. Panitkin4, A. I. Pavlinov46, T. Pawlak44, T. Peitzmann27, V. Perevoztchikov4, C. Perkins6, W. Peryt44, V. A. Petrov13, S. C. Phatak15, R. Picha7, M. Planinic49, J. Pluta44, N. Porile32, J. Porter45, A. M. Poskanzer21, M. Potekhin4, E. Potrebenikova12, B. V. K. S. Potukuchi19, D. Prindle45, C. Pruneau46, J. Putschke23, G. Rakness30, R. Raniwala33, S. Raniwala33, O. Ravel38, R. L. Ray40, S. V. Razin12, D. Reichhold32, J. G. Reid45, J. Reinnarth38, G. Renault38, F. Retiere21, A. Ridiger25, H. G. Ritter21, J. B. Roberts34, O. V. Rogachevskiy12, J. L. Romero7, A. Rose46, C. Roy38, L. Ruan36, M. J. Russcher50, R. Sahoo15, I. Sakrejda21, S. Salur48, J. Sandweiss48, M. Sarsour17, I. Savin13, P. S. Sazhin12, J. Schambach40, R. P. Scharenberg32, N. Schmitz23, K. Schweda21, J. Seger10, P. Seyboth23, E. Shahaliev12, M. Shao36, W. Shao5, M. Sharma29, W. Q. Shen37, K. E. Shestermanov31, S. S. Shimanskiy12, E Sichtermann21, F. Simon23, R. N. Singaraju43, N. Smirnov48, R. Snellings27, G. Sood42, P. Sorensen21, J. Sowinski17, J. Speltz18, H. M. Spinka1, B. Srivastava32, A. Stadnik12, T. D. S. Stanislaus42, R. Stock14, A. Stolpovsky46, M. Strikhanov25, B. Stringfellow32, A. A. P. Suaide35, E. Sugarbaker28, C. Suire4, M. Sumbera11, B. Surrow22, M. Swanger10, T. J. M. Symons21, A. Szanto de Toledo35, A. Tai8, J. Takahashi35, A. H. Tang27, T. Tarnowsky32, D. Thein8, J. H. Thomas21, S. Timoshenko25, M. Tokarev12, T. A. Trainor45, S. Trentalange8, R. E. Tribble39, O. D. Tsai8, J. Ulery32, T. Ullrich4, D. G. Underwood1, G. Van Buren4, M. van Leeuwen21, A. M. Vander Molen24, R. Varma16, I. M. Vasilevski13, A. N. Vasiliev31, R. Vernet18, S. E. Vigdor17, Y. P. Viyogi43, S. Vokal12, S. A. Voloshin46, W. T. Waggoner10, F. Wang32, G. Wang20, G. Wang5, X. L. Wang36, Y. Wang40, Y. Wang41, Z. M. Wang36, H. Ward40, J. W. Watson20, J. C. Webb17, G. D. Westfall24, A. Wetzler21, C. Whitten, Jr.8, H. Wieman21, S. W. Wissink17, R. Witt2, J. Wood8, J. Wu36, N. Xu21, Z. Xu4, Z. Z. Xu36, E. Yamamoto21, P. Yepes34, V. I. Yurevich12, I. Zborovsky11, H. Zhang4, W. M. Zhang20, Y. Zhang36, Z. P. Zhang36, R. Zoulkarneev13, Y. Zoulkarneeva13, and A. N. Zubarev12 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Bern, 3012 Bern, Switzerland
3University of Birmingham, Birmingham, United Kingdom
4Brookhaven National Laboratory, Upton, New York 11973, USA
5California Institute of Technology, Pasadena, California 91125, USA
6University of California, Berkeley, California 94720, USA
7University of California, Davis, California 95616, USA
8University of California, Los Angeles, California 90095, USA
9Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
10Creighton University, Omaha, Nebraska 68178, USA
11Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
12Laboratory for High Energy (JINR), Dubna, Russia
13Particle Physics Laboratory (JINR), Dubna, Russia
14University of Frankfurt, Frankfurt, Germany
15Institute of Physics, Bhubaneswar 751005, India
16Indian Institute of Technology, Mumbai, India
17Indiana University, Bloomington, Indiana 47408, USA
18Institut de Recherches Subatomiques, Strasbourg, France
19University of Jammu, Jammu 180001, India
20Kent State University, Kent, Ohio 44242, USA
21Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
22Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
23Max-Planck-Institut für Physik, Munich, Germany
24Michigan State University, East Lansing, Michigan 48824, USA
25Moscow Engineering Physics Institute, Moscow Russia
26City College of New York, New York City, New York 10031, USA
27NIKHEF, Amsterdam, The Netherlands
28Ohio State University, Columbus, Ohio 43210, USA
29Panjab University, Chandigarh 160014, India
30Pennsylvania State University, University Park, Pennsylvania 16802, USA
31Institute of High Energy Physics, Protvino, Russia
32Purdue University, West Lafayette, Indiana 47907, USA
33University of Rajasthan, Jaipur 302004, India
34Rice University, Houston, Texas 77251, USA
35Universidade de Sao Paulo, Sao Paulo, Brazil
36University of Science & Technology of China, Anhui 230027, China
37Shanghai Institute of Applied Physics, Shanghai 201800, China
38SUBATECH, Nantes, France
39Texas A&M University, College Station, Texas 77843, USA
40University of Texas, Austin, Texas 78712, USA
41Tsinghua University, Beijing 100084, China
42Valparaiso University, Valparaiso, Indiana 46383, USA
43Variable Energy Cyclotron Centre, Kolkata 700064, India
44Warsaw University of Technology, Warsaw, Poland
45University of Washington, Seattle, Washington 98195, USA
46Wayne State University, Detroit, Michigan 48201, USA
47Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
48Yale University, New Haven, Connecticut 06520, USA
49University of Zagreb, Zagreb, HR-10002, Croatia
50NIKHEF and Utrecht University, Amsterdam, The Netherlands
Received 4 February 2005; revised 12 April 2005; published 5 August 2005
We present the first measurement of pseudorapidity distribution of photons in the region 2.3≤η≤3.7 for different centralities in Au+Au collisions at sqrt[sNN]=62.4 GeV. We find that the photon yield scales with the number of participating nucleons at all collision centralities studied. The pseudorapidity distribution of photons, dominated by π0 decays, has been compared to those of charged pions, photons, and inclusive charged particles from heavy-ion and nucleon-nucleon collisions at various energies. The photon production has been shown to be consistent with the energy and centrality independent limiting fragmentation scenario.
©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.95.062301
DOI: 10.1103/PhysRevLett.95.062301
PACS: 25.75.Dw
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