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

**Autoria(s):** ABELEV, B. I.; AGGARWAL, M. M.; AHAMMED, Z.; ALAKHVERDYANTS, A. V.; ANDERSON, B. D.; ARKHIPKIN, D.; AVERICHEV, G. S.; BADYAL, S. K.; BALEWSKI, J.; BARANNIKOVA, O.; BARNBY, L. S.; BAUDOT, J.; BAUMGART, S.; BEAVIS, D. R.; BELLWIED, R.; BENEDOSSO, F.; BETANCOURT, M. J.; BETTS, R. R.; BHASIN, A.; BHATI, A. K.; BICHSEL, H.; BIELCIK, J.; BIELCIKOVA, J.; BIRITZ, B.; BLAND, L. C.; BNZAROV, I.; BOMBARA, M.; BONNER, B. E.; BOUCHET, J.; BRAIDOT, E.; BRANDIN, A. V.; BRUNA, E.; BUELTMANN, S.; BURTON, T. P.; BYSTERSKY, M.; CAI, X. Z.; CAINES, H.; CALDERON, M.; CATU, O.; CEBRA, D.; CENDEJAS, R.; CERVANTES, M. C.; CHAJECKI, Z.; CHALOUPKA, P.; CHATTOPADHYAY, S.; CHEN, H. F.; CHEN, J. H.; CHEN, J. Y.; CHENG, J.; CHERNEY, M.; CHIKANIAN, A.; CHOI, K. E.; CHRISTIE, W.; CLARKE, R. F.; CODRINGTON, M. J. M.; CORLISS, R.; CORMIER, T. M.; Cosentino, Mauro Rogerio; CRAMER, J. G.; CRAWFORD, H. J.; DAS, D.; DAS, S.; DASH, S.; DAUGHERITY, M.; SILVA, L. C. De; DEDOVICH, T. G.; DEPHILLIPS, M.; DEREVSCHIKOV, A. A.; SOUZA, R. Derradi de; DIDENKO, L.; DJAWOTHO, P.; DOGRA, S. M.; DONG, X.; DRACHENBERG, J. L.; DRAPER, J. E.; DUNLOP, J. C.; MAZUMDAR, M. R. Dutta; EFIMOV, L. G.; ELHALHULI, E.; ELNIMR, M.; ENGELAGE, J.; EPPLEY, G.; ERAZMUS, B.; ESTIENNE, M.; EUN, L.; FACHINI, P.; FATEMI, R.; FEDORISIN, J.; FENG, A.; FILIP, P.; FINCH, E.; FINE, V.; FISYAK, Y.; GAGLIARDI, C. A.; GAILLARD, L.; GANGADHARAN, D. R.; GANTI, M. S.; GARCIA-SOLIS, E. J.; GEROMITSOS, A.; GEURTS, F.; GHAZIKHANIAN, V.; GHOSH, P.; GORBUNOV, Y. N.; GORDON, A.; GREBENYUK, O.; GROSNICK, D.; GRUBE, B.; GUERTIN, S. M.; Guimarães, Karin Silvia Franzoni Fornazier; GUPTA, A.; GUPTA, N.; GURYN, W.; HAAG, B.; HALLMAN, T. J.; HAMED, A.; HARRIS, J. W.; HE, W.; HEINZ, M.; HEPPLEMANN, S.; HIPPOLYTE, B.; HIRSCH, A.; HJORT, E.; HOFFMAN, A. M.; HOFFMANN, G. W.; HOFMAN, D. J.; HOLLIS, R. S.; HUANG, H. Z.; HUMANIC, T. J.; HUO, L.; IGO, G.; LORDANOVA, A.; JACOBS, P.; JACOBS, W. W.; JAKL, P.; JENA, C.; JIN, F.; JONES, C. L.; JONES, P. G.; JOSEPH, J.; JUDD, E. G.; KABANA, S.; KAJIMOTO, K.; KANG, K.; KAPITAN, J.; KAUDER, K.; KEANE, D.; KECHECHYAN, A.; KETTLER, D.; KHODYREV, V. Yu.; KIKOLA, D. P.; KIRYLUK, J.; KISIEL, A.; KLEIN, S. R.; KNOSPE, A. G.; KOCOLOSKI, A.; KOETKE, D. D.; KONZER, J.; KOPYTINE, M.; KORALT, I.; KORSCH, W.; KOTCHENDA, L.; KOUCHPIL, V.; KRAVTSOV, P.; KRAVTSOV, V. I.; KRUEGER, K.; KRUS, M.; KUHN, C.; KUMAR, L.; KURNADI, P.; LAMONT, M. A. C.; LANDGRAF, J. M.; LAPOINTE, S.; LAURET, J.; LEBEDEV, A.; LEDNICKY, R.; LEE, C. -H.; LEE, J. H.; LEIGHT, W.; LEVINE, M. J.; LI, C.; LI, N.; LI, Y.; LIN, G.; LINDENBAUM, S. J.; LISA, M. A.; LIU, F.; LIU, H.; LIU, J.; LIU, L.; LJUBICIC, T.; LLOPE, W. J.; LONGACRE, R. S.; LOVE, W. A.; LU, Y.; LUDLAM, T.; MA, G. L.; MA, Y. G.; MAHAPATRA, D. P.; MAJKA, R.; MALL, O. I.; MANGOTRA, L. K.; MANWEILER, R.; MARGETIS, S.; MARKERT, C.; MASUI, H.; MATIS, H. S.; MATULENKO, Yu. A.; MCDONALD, D.; MCSHANE, T. S.; MESCHANIN, A.; MILLNER, R.; MINAEV, N. G.; MIODUSZEWSKI, S.; MISCHKE, A.; MOHANTY, B.; MONDAL, M. M.; MOROZOV, D. A.; Munhoz, Marcelo Gameiro; NANDI, B. K.; NATTRASS, C.; NAYAK, T. K.; NELSON, J. M.; NETRAKANTI, P. K.; NG, M. J.; NOGACH, L. V.; NURUSHEV, S. B.; ODYNIEC, G.; OGAWA, A.; OKADA, H.; OKOROKOV, V.; OLSON, D.; PACHR, M.; PAGE, B. S.; PAL, S. K.; PANDIT, Y.; PANEBRATSEV, Y.; PAWLAK, T.; PEITZMANN, T.; PEREVOZTCHIKOV, V.; PERKINS, C.; PERYT, W.; PHATAK, S. C.; PILE, P.; PLANINIC, M.; PLOSKON, M. A.; PLUTA, J.; PLYKU, D.; POLJAK, N.; POSKANZER, A. M.; POTUKUCHI, B. V. K. S.; PRINDLE, D.; PRUNEAU, C.; PRUTHI, N. K.; PUJAHARI, P. R.; PUTSCHKE, J.; RANIWALA, R.; RANIWALA, S.; RAY, R. L.; REDWINE, R.; REED, R.; RIDIGER, A.; RITTER, H. G.; ROBERTS, J. B.; ROGACHEVSKIY, O. V.; ROMERO, J. L.; ROSE, A.; ROY, C.; RUAN, L.; RUSSCHER, M. J.; SAHOO, R.; SAKAI, S.; SAKREJDA, I.; SAKUMA, T.; SALUR, S.; SANDWEISS, J.; SARSOUR, M.; SCHAMBACH, J.; SCHARENBERG, R. P.; SCHMITZ, N.; SEGER, J.; SELYUZHENKOV, I.; SEYBOTH, P.; SHABETAI, A.; SHAHALIEV, E.; SHAO, M.; SHARMA, M.; SHI, S. S.; SHI, X. -H.; SICHTERMANN, E. P.; SIMON, F.; SINGARAJU, R. N.; SKOBY, M. J.; SMIRNOV, N.; SORENSEN, P.; SOWINSKI, J.; SPINKA, H. M.; SRIVASTAVA, B.; STANISLAUS, T. D. S.; STASZAK, D.; STRIKHANOV, M.; STRINGFELLOW, B.; Suaide, Alexandre Alarcon do Passo; SUAREZ, M. C.; SUBBA, N. L.; SUMBERA, M.; SUN, X. M.; SUN, Y.; SUN, Z.; SURROW, B.; SYMONS, T. J. M.; Szanto de Toledo, Alejandro; TAKAHASHI, J.; TANG, A. H.; TANG, Z.; TARINI, L. H.; TARNOWSKY, T.; THEIN, D.; THOMAS, J. H.; TIAN, J.; TIMMINS, A. R.; TIMOSHENKO, S.; TLUSTY, D.; TOKAREV, M.; TRAINOR, T. A.; TRAM, V. N.; TRATTNER, A. L.; TRENTALANGE, S.; TRIBBLE, R. E.; TSAI, O. D.; ULERY, J.; ULLRICH, T.; UNDERWOOD, D. G.; BUREN, G. Van; LEEUWEN, M. van; NIEUWENHUIZEN, G. van; VANFOSSEN JR., J. A.; VARMA, R.; VASCONCELOS, G. M. S.; VASILIEV, A. N.; VIDEBAEK, F.; VIGDOR, S. E.; VIYOGI, Y. P.; VOKAL, S.; VOLOSHIN, S. A.; WADA, M.; WALKER, M.; WANG, F.; WANG, G.; WANG, H.; WANG, J. S.; WANG, Q.; WANG, X.; WANG, X. L.; WANG, Y.; WEBB, G.; WEBB, J. C.; WESTFALL, G. D.; WHITTEN JR., C.; WIEMAN, H.; WISSINK, S. W.; WITT, R.; WU, Y.; XIE, W.; XU, N.; XU, Q. H.; XU, Y.; XU, Z.; YANG, Y.; YEPES, P.; YIP, K.; YOO, I. -K.; YUE, Q.; ZAWISZA, M.; ZBROSZCZYK, H.; ZHAN, W.; ZHANG, S.; ZHANG, W. M.; ZHANG, X. P.; ZHANG, Y.; ZHANG, Z. P.; ZHAO, Y.; ZHONG, C.; ZHOU, J.; ZHU, X.; ZOULKARNEEV, R.; ZOULKARNEEVA, Y.; ZUO, J. X.; STAR Collaboration
Contribuinte(s)	UNIVERSIDADE DE SÃO PAULO
Data(s)	20/10/2012 20/10/2012 2010
Resumo	We present the multiplicity and pseudorapidity distributions of photons produced in Au + Au and Cu + Cu collisions at root(s)NN = 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(s)NN = 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. U.S. Department of Energy (DOE) Offices of NP and HEP within the US DOE Office of Science U.S. National Science Foundation (NSF) US NSF Sloan Foundation Sloan Foundation DFG cluster of excellence `Origin and Structure of the Universe` Deutsche Forschungsgemeinschaf (DFG) CNRS/IN2P3 CNRS/IN2P3 STFC and EPSRC of the United Kingdom STFC and EPSRC of the United Kingdom FAPESP CNPq of Brazil Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Ministry of Ed. and Sci. of the Russian Federation Ministry of Ed. and Sci. of the Russian Federation Natural Science Foundation of China (NSFC) NNSFC Natural Science Foundation of China Chinese Academy of Sciences (CAS) CAS of China MoST of China MoST of China MoE of China MoE of China GA and MSMT of the Czech Republic GA and MSMT of the Czech Republic FOM and NWO of the Netherlands Foundation for Fundamental Research on Matter (FOM) Netherlands Organisation for Scientific Research (NWO) DAE Department of Atomic Energy of India (DAE) DST DST India Council for Scientific and Industrial Research (CSIR) CSIR of India Polish Ministry of Sci. and Higher Ed. Polish Ministry of Sci. and Higher Ed. Korea Research Foundation Korea Research Foundation Ministry of Sci., Ed. and Sports of the Rep. of Croatia Ministry of Sci., Ed. and Sports of the Rep. of Croatia Russian Ministry of Sci. and Tech. Russian Ministry of Sci. and Tech. RosAtom of Russia RosAtom of Russia
Identificador	NUCLEAR PHYSICS A, v.832, n.1/Fev, p.134-147, 2010 0375-9474 http://producao.usp.br/handle/BDPI/29487 10.1016/j.nuclphysa.2009.11.011 http://dx.doi.org/10.1016/j.nuclphysa.2009.11.011
Idioma(s)	eng
Publicador	ELSEVIER SCIENCE BV
Relação	Nuclear Physics A
Direitos	restrictedAccess Copyright ELSEVIER SCIENCE BV
Palavras-Chave	#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 #Physics, Nuclear
Tipo	article original article publishedVersion

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