/ Experiment-Nucl arXiv:1205.5759


Measurement of Direct Photons in Au+Au Collisions at $\sqrt{s_{NN}} = 200$ GeV


Afanasiev, S. (Dubna, JINR) ; Aidala, C. (Nevis Labs, Columbia U.) ; Ajitanand, N.N. (SUNY, Stony Brook) ; Akiba, Y. (Brookhaven) ; Al-Jamel, A. (New Mexico State U.) ; Alexander, J. (SUNY, Stony Brook) ; Aoki, K. (Nishina Ctr., RIKEN) ; Aphecetche, L. (SUBATECH, Nantes) ; Armendariz, R. (New Mexico State U.) ; Aronson, S.H. (Brookhaven) ; Averbeck, R. (SUNY, Stony Brook) ; Awes, T.C. (Oak Ridge) ; Azmoun, B. (Brookhaven) ; Babintsev, V. (Serpukhov, IHEP) ; Baldisseri, A. (DAPNIA, Saclay) ; Barish, K.N. (UC, Riverside) ; Barnes, P.D. (Los Alamos) ; Bassalleck, B. (New Mexico U.) ; Bathe, S. (UC, Riverside) ; Batsouli, S. (Nevis Labs, Columbia U.) ; Baublis, V. (St. Petersburg, INP) ; Bauer, F. (UC, Riverside) ; Bazilevsky, A. (Brookhaven) ; Belikov, S. (Iowa State U.) ; Bennett, R. (SUNY, Stony Brook) ; Berdnikov, Y. (St. Petersburg Polytechnic Inst.) ; Bjorndal, M.T. (Nevis Labs, Columbia U.) ; Boissevain, J.G. (Los Alamos) ; Borel, H. (DAPNIA, Saclay) ; Boyle, K. (SUNY, Stony Brook) ; Brooks, M.L. (Los Alamos) ; Brown, D.S. (New Mexico State U.) ; Bucher, D. (Munster U.) ; Buesching, H. (Brookhaven) ; Bumazhnov, V. (Serpukhov, IHEP) ; Bunce, G. (Brookhaven) ; Burward-Hoy, J.M. (Los Alamos) ; Butsyk, S. (SUNY, Stony Brook) ; Campbell, S. (SUNY, Stony Brook) ; Chai, J.S. (Korea U.) ; Chernichenko, S. (Serpukhov, IHEP) ; Chi, C.Y. (Nevis Labs, Columbia U.) ; Chiba, J. (KEK, Tsukuba) ; Chiu, M. (Nevis Labs, Columbia U.) ; Choi, I.J. (Yonsei U.) ; Chujo, T. (Vanderbilt U.) ; Cianciolo, V. (Oak Ridge) ; Cleven, C.R. (Georgia State U.) ; Cobigo, Y. (DAPNIA, Saclay) ; Cole, B.A. (Nevis Labs, Columbia U.) ; Comets, M.P. (Orsay, IPN) ; Connors, M. (SUNY, Stony Brook) ; Constantin, P. (Iowa State U.) ; Csanad, M. (Eotvos U.) ; Csorgo, T. (Budapest, RMKI) ; Dahms, T. (SUNY, Stony Brook) ; Das, K. (Florida State U.) ; David, G. (Brookhaven) ; Delagrange, H. (SUBATECH, Nantes) ; Denisov, A. (Serpukhov, IHEP) ; d'Enterria, D. (Nevis Labs, Columbia U.) ; Deshpande, A. (SUNY, Stony Brook) ; Desmond, E.J. (Brookhaven) ; Dietzsch, O. (Sao Paulo U.) ; Dion, A. (SUNY, Stony Brook) ; Drachenberg, J.L. (Abilene Christian U.) ; Drapier, O. (Ecole Polytechnique) ; Drees, A. (SUNY, Stony Brook) ; Dubey, A.K. (Weizmann Inst.) ; Durum, A. (Serpukhov, IHEP) ; Dzhordzhadze, V. (Tennessee U.) ; Efremenko, Y.V. (Oak Ridge) ; Egdemir, J. (SUNY, Stony Brook) ; Enokizono, A. (Hiroshima U.) ; En'yo, H. (Brookhaven) ; Espagnon, B. (Orsay, IPN) ; Esumi, S. (Tsukuba U.) ; Fields, D.E. (Brookhaven) ; Fleuret, F. (Ecole Polytechnique) ; Fokin, S.L. (Kurchatov Inst., Moscow) ; Forestier, B. (Clermont-Ferrand U.) ; Fraenkel, Z. (Weizmann Inst.) ; Frantz, J.E. (Nevis Labs, Columbia U.) ; Franz, A. (Brookhaven) ; Frawley, A.D. (Florida State U.) ; Fukao, Y. (Nishina Ctr., RIKEN) ; Fung, S.Y. (UC, Riverside) ; Gadrat, S. (Clermont-Ferrand U.) ; Gastineau, F. (SUBATECH, Nantes) ; Germain, M. (SUBATECH, Nantes) ; Glenn, A. (Tennessee U.) ; Gonin, M. (Ecole Polytechnique) ; Gosset, J. (DAPNIA, Saclay) ; Goto, Y. (Brookhaven) ; Granier de Cassagnac, R. (Ecole Polytechnique) ; Grau, N. (Iowa State U.) ; Greene, S.V. (Vanderbilt U.) ; Grosse Perdekamp, M. (Brookhaven) ; Gunji, T. (Tokyo U.) ; Gustafsson, H.A. (Lund U.) ; Hachiya, T. (Nishina Ctr., RIKEN) ; Hadj Henni, A. (SUBATECH, Nantes) ; Haggerty, J.S. (Brookhaven) ; Hagiwara, M.N. (Abilene Christian U.) ; Hamagaki, H. (Tokyo U.) ; Harada, H. (Hiroshima U.) ; Hartouni, E.P. (LLNL, Livermore) ; Haruna, K. (Hiroshima U.) ; Harvey, M. (Brookhaven) ; Haslum, E. (Lund U.) ; Hasuko, K. (Nishina Ctr., RIKEN) ; Hayano, R. (Tokyo U.) ; He, X. (Georgia State U.) ; Heffner, M. (LLNL, Livermore) ; Hemmick, T.K. (SUNY, Stony Brook) ; Heuser, J.M. (Nishina Ctr., RIKEN) ; Hiejima, H. (Illinois U., Urbana) ; Hill, J.C. (Iowa State U.) ; Hobbs, R. (New Mexico U.) ; Holmes, M. (Vanderbilt U.) ; Holzmann, W. (SUNY, Stony Brook) ; Homma, K. (Hiroshima U.) ; Hong, B. (Korea U.) ; Horaguchi, T. (Tokyo Inst. Tech.) ; Hur, M.G. (Korea U.) ; Ichihara, T. (Brookhaven) ; Iinuma, H. (Nishina Ctr., RIKEN) ; Imai, K. (Nishina Ctr., RIKEN) ; Imrek, J. (Debrecen U.) ; Inaba, M. (Tsukuba U.) ; Isenhower, D. (Abilene Christian U.) ; Isenhower, L. (Abilene Christian U.) ; Ishihara, M. (Nishina Ctr., RIKEN) ; Isobe, T. (Tokyo U.) ; Issah, M. (SUNY, Stony Brook) ; Isupov, A. (Dubna, JINR) ; Jacak, B.V. (SUNY, Stony Brook) ; Jia, J. (Nevis Labs, Columbia U.) ; Jin, J. (Nevis Labs, Columbia U.) ; Jinnouchi, O. (Brookhaven) ; Johnson, B.M. (Brookhaven) ; Joo, K.S. (Myong Ji U.) ; Jouan, D. (Orsay, IPN) ; Kajihara, F. (Nishina Ctr., RIKEN) ; Kametani, S. (Waseda U.) ; Kamihara, N. (Tokyo Inst. Tech.) ; Kaneta, M. (Brookhaven) ; Kang, J.H. (Yonsei U.) ; Kawagishi, T. (Tsukuba U.) ; Kazantsev, A.V. (Kurchatov Inst., Moscow) ; Kelly, S. (Colorado U.) ; Khanzadeev, A. (St. Petersburg, INP) ; Kim, D.J. (Yonsei U.) ; Kim, E. (Seoul Natl. U.) ; Kim, Y.S. (Korea U.) ; Kinney, E. (Colorado U.) ; Kiss, A. (Eotvos U.) ; Kistenev, E. (Brookhaven) ; Kiyomichi, A. (Nishina Ctr., RIKEN) ; Klein-Boesing, C. (Munster U.) ; Kochenda, L. (St. Petersburg, INP) ; Kochetkov, V. (Serpukhov, IHEP) ; Komkov, B. (St. Petersburg, INP) ; Konno, M. (Tsukuba U.) ; Kotchetkov, D. (UC, Riverside) ; Kozlov, A. (Weizmann Inst.) ; Kroon, P.J. (Brookhaven) ; Kunde, G.J. (Los Alamos) ; Kurihara, N. (Tokyo U.) ; Kurita, K. (Rikkyo U.) ; Kweon, M.J. (Korea U.) ; Kwon, Y. (Yonsei U.) ; Kyle, G.S. (New Mexico State U.) ; Lacey, R. (SUNY, Stony Brook) ; Lajoie, J.G. (Iowa State U.) ; Lebedev, A. (Iowa State U.) ; Le Bornec, Y. (Orsay, IPN) ; Leckey, S. (SUNY, Stony Brook) ; Lee, D.M. (Los Alamos) ; Lee, M.K. (Yonsei U.) ; Leitch, M.J. (Los Alamos) ; Leite, M.A.L. (Sao Paulo U.) ; Li, X.H. (UC, Riverside) ; Lim, H. (Seoul Natl. U.) ; Litvinenko, A. (Dubna, JINR) ; Liu, M.X. (Los Alamos) ; Maguire, C.F. (Vanderbilt U.) ; Makdisi, Y.I. (Brookhaven) ; Malakhov, A. (Dubna, JINR) ; Malik, M.D. (New Mexico U.) ; Manko, V.I. (Kurchatov Inst., Moscow) ; Masui, H. (Tsukuba U.) ; Matathias, F. (SUNY, Stony Brook) ; McCain, M.C. (Illinois U., Urbana) ; McGaughey, P.L. (Los Alamos) ; Miake, Y. (Tsukuba U.) ; Miller, T.E. (Vanderbilt U.) ; Milov, A. (SUNY, Stony Brook) ; Mioduszewski, S. (Brookhaven) ; Mishra, G.C. (Georgia State U.) ; Mitchell, J.T. (Brookhaven) ; Morrison, D.P. (Brookhaven) ; Moss, J.M. (Los Alamos) ; Moukhanova, T.V. (Kurchatov Inst., Moscow) ; Mukhopadhyay, D. (Vanderbilt U.) ; Murata, J. (Rikkyo U.) ; Nagamiya, S. (KEK, Tsukuba) ; Nagata, Y. (Tsukuba U.) ; Nagle, J.L. (Colorado U.) ; Naglis, M. (Weizmann Inst.) ; Nakamura, T. (Hiroshima U.) ; Newby, J. (LLNL, Livermore) ; Nguyen, M. (SUNY, Stony Brook) ; Norman, B.E. (Los Alamos) ; Nyanin, A.S. (Kurchatov Inst., Moscow) ; Nystrand, J. (Lund U.) ; O'Brien, E. (Brookhaven) ; Ogilvie, C.A. (Iowa State U.) ; Ohnishi, H. (Nishina Ctr., RIKEN) ; Ojha, I.D. (Vanderbilt U.) ; Okada, K. (Brookhaven) ; Omiwade, O.O. (Abilene Christian U.) ; Oskarsson, A. (Lund U.) ; Otterlund, I. (Lund U.) ; Ozawa, K. (Tokyo U.) ; Pal, D. (Vanderbilt U.) ; Palounek, A.P.T. (Los Alamos) ; Pantuev, V. (SUNY, Stony Brook) ; Papavassiliou, V. (New Mexico State U.) ; Park, J. (Seoul Natl. U.) ; Park, W.J. (Korea U.) ; Pate, S.F. (New Mexico State U.) ; Pei, H. (Iowa State U.) ; Peng, J.C. (Illinois U., Urbana) ; Pereira, H. (DAPNIA, Saclay) ; Peresedov, V. (Dubna, JINR) ; Peressounko, D.Yu. (Kurchatov Inst., Moscow) ; Pinkenburg, C. (Brookhaven) ; Pisani, R.P. (Brookhaven) ; Purschke, M.L. (Brookhaven) ; Purwar, A.K. (SUNY, Stony Brook) ; Qu, H. (Georgia State U.) ; Rak, J. (Iowa State U.) ; Ravinovich, I. (Weizmann Inst.) ; Read, K.F. (Tennessee U.) ; Reuter, M. (SUNY, Stony Brook) ; Reygers, K. (Munster U.) ; Riabov, V. (St. Petersburg, INP) ; Riabov, Y. (St. Petersburg, INP) ; Roche, G. (Clermont-Ferrand U.) ; Romana, A. (Ecole Polytechnique) ; Rosati, M. (Iowa State U.) ; Rosendahl, S.S.E. (Lund U.) ; Rosnet, P. (Clermont-Ferrand U.) ; Rukoyatkin, P. (Dubna, JINR) ; Rykov, V.L. (Nishina Ctr., RIKEN) ; Ryu, S.S. (Yonsei U.) ; Sahlmueller, B. (SUNY, Stony Brook) ; Saito, N. (Brookhaven) ; Sakaguchi, T. (Waseda U.) ; Sakai, S. (Tsukuba U.) ; Samsonov, V. (St. Petersburg, INP) ; Sato, H.D. (Nishina Ctr., RIKEN) ; Sato, S. (Tsukuba U.) ; Sawada, S. (KEK, Tsukuba) ; Semenov, V. (Serpukhov, IHEP) ; Seto, R. (UC, Riverside) ; Sharma, D. (Weizmann Inst.) ; Shea, T.K. (Brookhaven) ; Shein, I. (Serpukhov, IHEP) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Shigaki, K. (Hiroshima U.) ; Shimomura, M. (Tsukuba U.) ; Shohjoh, T. (Tsukuba U.) ; Shoji, K. (Nishina Ctr., RIKEN) ; Sickles, A. (SUNY, Stony Brook) ; Silva, C.L. (Sao Paulo U.) ; Silvermyr, D. (Oak Ridge) ; Sim, K.S. (Korea U.) ; Singh, C.P. (Banaras Hindu U.) ; Singh, V. (Banaras Hindu U.) ; Skutnik, S. (Iowa State U.) ; Smith, W.C. (Abilene Christian U.) ; Soldatov, A. (Serpukhov, IHEP) ; Soltz, R.A. (LLNL, Livermore) ; Sondheim, W.E. (Los Alamos) ; Sorensen, S.P. (Tennessee U.) ; Sourikova, I.V. (Brookhaven) ; Staley, F. (DAPNIA, Saclay) ; Stankus, P.W. (Oak Ridge) ; Stenlund, E. (Lund U.) ; Stepanov, M. (New Mexico State U.) ; Ster, A. (Budapest, RMKI) ; Stoll, S.P. (Brookhaven) ; Sugitate, T. (Hiroshima U.) ; Suire, C. (Orsay, IPN) ; Sullivan, J.P. (Los Alamos) ; Sziklai, J. (Budapest, RMKI) ; Tabaru, T. (Brookhaven) ; Takagi, S. (Tsukuba U.) ; Takagui, E.M. (Sao Paulo U.) ; Taketani, A. (Brookhaven) ; Tanaka, K.H. (KEK, Tsukuba) ; Tanaka, Y. (Nagasaki Inst. Appl. Sci.) ; Tanida, K. (Seoul Natl. U.) ; Tannenbaum, M.J. (Brookhaven) ; Taranenko, A. (SUNY, Stony Brook) ; Tarjan, P. (Debrecen U.) ; Thomas, T.L. (New Mexico U.) ; Togawa, M. (Nishina Ctr., RIKEN) ; Tojo, J. (Nishina Ctr., RIKEN) ; Torii, H. (Nishina Ctr., RIKEN) ; Towell, R.S. (Abilene Christian U.) ; Tram, V-N. (Ecole Polytechnique) ; Tserruya, I. (Weizmann Inst.) ; Tsuchimoto, Y. (Nishina Ctr., RIKEN) ; Tuli, S.K. (Banaras Hindu U.) ; Tydesjo, H. (Lund U.) ; Tyurin, N. (Serpukhov, IHEP) ; Vale, C. (Iowa State U.) ; Valle, H. (Vanderbilt U.) ; van Hecke, H.W. (Los Alamos) ; Velkovska, J. (Vanderbilt U.) ; Vertesi, R. (Debrecen U.) ; Vinogradov, A.A. (Kurchatov Inst., Moscow) ; Vznuzdaev, E. (St. Petersburg, INP) ; Wagner, M. (Nishina Ctr., RIKEN) ; Wang, X.R. (New Mexico State U.) ; Watanabe, Y. (Brookhaven) ; Wessels, J. (Munster U.) ; White, S.N. (Brookhaven) ; Willis, N. (Orsay, IPN) ; Winter, D. (Nevis Labs, Columbia U.) ; Woody, C.L. (Brookhaven) ; Wysocki, M. (Colorado U.) ; Xie, W. (Brookhaven) ; Yanovich, A. (Serpukhov, IHEP) ; Yokkaichi, S. (Brookhaven) ; Young, G.R. (Oak Ridge) ; Younus, I. (New Mexico U.) ; Yushmanov, I.E. (Kurchatov Inst., Moscow) ; Zajc, W.A. (Nevis Labs, Columbia U.) ; Zaudtke, O. (Munster U.) ; Zhang, C. (Nevis Labs, Columbia U.) ; Zimanyi, J. (Budapest, RMKI) ; Zolin, L. (Dubna, JINR)

Pages: 7

Abstract: We report the measurement of direct photons at midrapidity in Au+Au collisions at sqrt{s_NN} = 200 GeV. The direct photon signal was extracted for the transverse-momentum range of 4 GeV/c < p_T < 22 GeV/c, using a statistical method to subtract decay photons from the inclusive-photon sample. The direct-photon nuclear-modification factor R_AA was calculated as a function of p_T for different Au+Au collision centralities using the measured p+p direct-photon spectrum and compared to theoretical predictions. R_AA was found to be consistent with unity for all centralities over the entire measured p_T range. Theoretical models that account for modifications of initial-direct-photon production due to modified-parton-distribution functions in Au and the different isospin composition of the nuclei, predict a modest change of R_AA from unity and are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.

Web-Page: http://inspirehep.net/record/1116179/files/arXiv:1205.5759.pdf


Note: Long author list - awaiting processing; PHENIX Collaboration, 346 authors, 8 pages, 4 figures, 1 table. Submitted to Phys. Rev. Lett. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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