Phys. Rev. C
73,
034906
(2006)
[14 pages]
Multiplicity and pseudorapidity distributions of charged particles and photons at forward pseudorapidity in Au+Au collisons at √sNN=62.4 GeV
J. Adams et al. STAR Collaboration
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J. Adams3, M. M. Aggarwal29, Z. Ahammed44, 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-Laurikainen39, R. Bellwied47, J. Berger14, B. I. Bezverkhny49, S. Bharadwaj34, A. Bhasin19, A. K. Bhati29, H. Bichsel46, J. Bielcik49, J. Bielcikova49, A. Billmeier47, L. C. Bland4, C. O. Blyth3, S.-L. Blyth21, B. E. Bonner35, M. Botje27, A. Boucham39, J. Bouchet39, A. V. Brandin25, A. Bravar4, M. Bystersky11, R. V. Cadman1, X. Z. Cai38, H. Caines49, M. Calderón de la Barca Sánchez17, J. Castillo21, O. Catu49, D. Cebra7, Z. Chajecki28, P. Chaloupka11, S. Chattopadhyay44, H. F. Chen37, J. H. Chen38, Y. Chen8, J. Cheng42, M. Cherney10, A. Chikanian49, H. A. Choi33, W. Christie4, J. P. Coffin18, T. M. Cormier47, M. R. Cosentino36, J. G. Cramer46, H. J. Crawford6, D. Das44, S. Das44, M. Daugherity41, M. M. de Moura36, T. G. Dedovich12, M. DePhillips4, A. A. Derevschikov31, L. Didenko4, T. Dietel14, S. M. Dogra19, W. J. Dong8, X. Dong37, J. E. Draper7, F. Du49, V. B. Dunin12, J. C. Dunlop4, M. R. Dutta Majumdar44, V. Eckardt23, W. R. Edwards21, L. G. Efimov12, V. Emelianov25, J. Engelage6, G. Eppley35, B. Erazmus39, M. Estienne39, P. Fachini4, J. Faivre18, R. Fatemi22, J. Fedorisin12, K. Filimonov21, P. Filip11, E. Finch49, V. Fine4, Y. Fisyak4, K. S. F. Fornazier36, J. Fu42, C. A. Gagliardi40, L. Gaillard3, J. Gans49, M. S. Ganti44, F. Geurts35, V. Ghazikhanian8, P. Ghosh44, J. E. Gonzalez8, Y. G. Gorbunov10, H. Gos45, O. Grachov47, O. Grebenyuk27, D. Grosnick43, S. M. Guertin8, Y. Guo47, A. Gupta19, N. Gupta19, T. D. Gutierrez7, T. J. Hallman4, A. Hamed47, D. Hardtke21, J. W. Harris49, M. Heinz2, T. W. Henry40, S. Hepplemann30, B. Hippolyte18, A. Hirsch32, E. Hjort21, G. W. Hoffmann41, M. J. Horner21, H. Z. Huang8, S. L. Huang37, E. W. Hughes5, T. J. Humanic28, G. Igo8, A. Ishihara41, P. Jacobs21, W. W. Jacobs17, H. Jiang8, P. G. Jones3, E. G. Judd6, S. Kabana2, K. Kang42, M. Kaplan9, D. Keane20, A. Kechechyan12, V. Yu. Khodyrev31, B. C. Kim33, J. Kiryluk22, A. Kisiel45, E. M. Kislov12, J. Klay21, S. R. Klein21, D. D. Koetke43, 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. Lamont49, J. M. Landgraf4, S. Lange14, F. Laue4, J. Lauret4, A. Lebedev4, R. Lednicky12, C.-H. Lee33, S. Lehocka12, M. J. LeVine4, C. Li37, Q. Li47, Y. Li42, G. Lin49, S. J. Lindenbaum26, M. A. Lisa28, F. Liu48, H. Liu37, J. Liu35, L. Liu48, Q. J. Liu46, Z. Liu48, T. Ljubicic4, W. J. Llope35, H. Long8, R. S. Longacre4, M. Lopez-Noriega28, W. A. Love4, Y. Lu48, T. Ludlam4, D. Lynn4, G. L. Ma38, J. G. Ma8, Y. G. Ma38, D. Magestro28, S. Mahajan19, D. P. Mahapatra15, R. Majka49, L. K. Mangotra19, R. Manweiler43, S. Margetis20, C. Markert20, L. Martin39, 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. Mitchell35, B. Mohanty44, L. Molnar32, C. F. Moore41, D. A. Morozov31, M. G. Munhoz36, B. K. Nandi16, S. K. Nayak19, T. K. Nayak44, J. M. Nelson3, P. K. Netrakanti44, V. A. Nikitin13, L. V. Nogach31, S. B. Nurushev31, G. Odyniec21, A. Ogawa4, V. Okorokov25, M. Oldenburg21, D. Olson21, S. K. Pal44, Y. Panebratsev12, S. Y. Panitkin4, A. I. Pavlinov47, T. Pawlak45, T. Peitzmann27, V. Perevoztchikov4, C. Perkins6, W. Peryt45, V. A. Petrov47, S. C. Phatak15, R. Picha7, M. Planinic50, J. Pluta45, N. Porile32, J. Porter46, A. M. Poskanzer21, M. Potekhin4, E. Potrebenikova12, B. V. K. S. Potukuchi19, D. Prindle46, C. Pruneau47, J. Putschke21, G. Rakness30, R. Raniwala34, S. Raniwala34, O. Ravel39, R. L. Ray41, S. V. Razin12, D. Reichhold32, J. G. Reid46, J. Reinnarth39, G. Renault39, F. Retiere21, A. Ridiger25, H. G. Ritter21, J. B. Roberts35, O. V. Rogachevskiy12, J. L. Romero7, A. Rose21, C. Roy39, L. Ruan37, M. J. Russcher27, R. Sahoo15, I. Sakrejda21, S. Salur49, J. Sandweiss49, M. Sarsour40, I. Savin13, P. S. Sazhin12, J. Schambach41, R. P. Scharenberg32, N. Schmitz23, K. Schweda21, J. Seger10, I. Selyuzhenkov47, P. Seyboth23, E. Shahaliev12, M. Shao37, W. Shao5, M. Sharma29, W. Q. Shen38, K. E. Shestermanov31, S. S. Shimanskiy12, E. Sichtermann21, F. Simon22, R. N. Singaraju44, N. Smirnov49, R. Snellings27, G. Sood43, P. Sorensen4, J. Sowinski17, J. Speltz18, H. M. Spinka1, B. Srivastava32, A. Stadnik12, T. D. S. Stanislaus43, R. Stock14, A. Stolpovsky47, M. Strikhanov25, B. Stringfellow32, A. A. P. Suaide36, E. Sugarbaker28, M. Sumbera11, B. Surrow22, M. Swanger10, T. J. M. Symons21, A. Szanto de Toledo36, A. Tai8, J. Takahashi36, A. H. Tang27, T. Tarnowsky32, D. Thein8, J. H. Thomas21, A. R. Timmins3, S. Timoshenko25, M. Tokarev12, T. A. Trainor46, S. Trentalange8, R. E. Tribble40, O. D. Tsai8, J. Ulery32, T. Ullrich4, D. G. Underwood1, G. van Buren4, N. van der Kolk27, M. van Leeuwen21, A. M. Vander Molen24, R. Varma16, I. M. Vasilevski13, A. N. Vasiliev31, R. Vernet18, S. E. Vigdor17, Y. P. Viyogi44, S. Vokal12, S. A. Voloshin47, W. T. Waggoner10, F. Wang32, G. Wang20, G. Wang5, X. L. Wang37, Y. Wang41, Y. Wang42, Z. M. Wang37, H. Ward41, 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. Wu37, N. Xu21, Z. Xu4, Z. Z. Xu37, E. Yamamoto21, P. Yepes35, I.-K. Yoo33, V. I. Yurevich12, I. Zborovsky11, H. Zhang4, W. M. Zhang20, Y. Zhang37, Z. P. Zhang37, C. Zhong38, R. Zoulkarneev13, Y. Zoulkarneeva13, A. N. Zubarev12, and J. X. Zuo38 (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, New York 10031, USA
27NIKHEF and Utrecht University, 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
33Pusan National University, Pusan, Republic of Korea
34University of Rajasthan, Jaipur 302004, India
35Rice University, Houston, Texas 77251, USA
36Universidade de Sao Paulo, Sao Paulo, Brazil
37University of Science & Technology of China, Hefei 230026, China
38Shanghai Institute of Applied Physics, Shanghai 201800, China
39SUBATECH, Nantes, France
40Texas A&M University, College Station, Texas 77843, USA
41University of Texas, Austin, Texas 78712, USA
42Tsinghua University, Beijing 100084, China
43Valparaiso University, Valparaiso, Indiana 46383, USA
44Variable Energy Cyclotron Centre, Kolkata 700064, India
45Warsaw University of Technology, Warsaw, Poland
46University of Washington, Seattle, Washington 98195, USA
47Wayne State University, Detroit, Michigan 48201, USA
48Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
49Yale University, New Haven, Connecticut 06520, USA
50University of Zagreb, Zagreb, HR-10002, Croatia
Received 14 November 2005; published 13 March 2006
We present the centrality-dependent measurement of multiplicity and pseudorapidity distributions of charged particles and photons in Au+Au collisions at √sNN=62.4 GeV. The charged particles and photons are measured in the pseudorapidity region 2.9≤η≤3.9 and 2.3≤η≤3.7, respectively. We have studied the scaling of particle production with the number of participating nucleons and the number of binary collisions. The photon and charged particle production in the measured pseudorapidity range has been shown to be consistent with energy-independent limiting fragmentation behavior. Photons are observed to follow a centrality-independent limiting fragmentation behavior, while for charged particles it is centrality dependent. We have carried out a comparative study of the pseudorapidity distributions of positively charged hadrons, negatively charged hadrons, photons, pions, and net protons in nucleus-nucleus collisions and pseudorapidity distributions from p+p collisions. From these comparisons, we conclude that baryons in the inclusive charged particle distribution are responsible for the observed centrality dependence of limiting fragmentation. The mesons are found to follow an energy-independent behavior of limiting fragmentation, whereas the behavior of baryons is energy dependent.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.034906
DOI:
10.1103/PhysRevC.73.034906
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