Measurement of Direct Photons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
Creators: name: Afanasiev, S.
name: Aidala, C.
name: Ajitanand, N. N.
name: Akiba, Y.
name: Al-Jamel, A.
name: Alexander, J.
name: Aoki, K.
name: Aphecetche, L.
name: Armendariz, R.
name: Aronson, S. H.
name: Averbeck, R.
name: Awes, T. C.
name: Azmoun, B.
name: Babintsev, V.
name: Baldisseri, A.
name: Barish, K. N.
name: Barnes, P. D.
name: Bassalleck, B.
name: Bathe, S.
name: Batsouli, S.
name: Baublis, V.
name: Bauer, F.
name: Bazilevsky, A.
name: Belikov, S.
name: Bennett, R.
name: Berdnikov, Y.
name: Bjorndal, M. T.
name: Boissevain, J. G.
name: Borel, H.
name: Boyle, K.
name: Brooks, M. L.
name: Brown, D. S.
name: Bucher, D.
name: Buesching, H.
name: Bumazhnov, V.
name: Bunce, G.
name: Burward-Hoy, J. M.
name: Butsyk, S.
name: Campbell, S.
name: Chai, J. -S.
name: Chernichenko, S.
name: Chi, C. Y.
name: Chiba, J.
name: Chiu, M.
name: Choi, I. J.
name: Chujo, T.
name: Cianciolo, V.
name: Cleven, C. R.
name: Cobigo, Y.
name: Cole, B. A.
name: Comets, M. P.
name: Connors, M.
name: Constantin, P.
name: Csanád, M.
name: Csörgő, T.
name: Dahms, T.
name: Das, K.
name: David, G.
name: Delagrange, H.
name: Denisov, A.
name: d'Enterria, D.
name: Deshpande, A.
name: Desmond, E. J.
name: Dietzsch, O.
name: Dion, A.
name: Drachenberg, J. L.
name: Drapier, O.
name: Drees, A.
name: Dubey, A. K.
name: Durum, A.
name: Dzhordzhadze, V.
name: Efremenko, Y. V.
name: Egdemir, J.
name: Enokizono, A.
name: En'yo, H.
name: Espagnon, B.
name: Esumi, S.
name: Fields, D. E.
name: Fleuret, F.
name: Fokin, S. L.
name: Forestier, B.
name: Fraenkel, Z.
name: Frantz, J. E.
name: Franz, A.
name: Frawley, A. D.
name: Fukao, Y.
name: Fung, S. -Y.
name: Gadrat, S.
name: Gastineau, F.
name: Germain, M.
name: Glenn, A.
name: Gonin, M.
name: Gosset, J.
name: Goto, Y.
name: de Cassagnac, R. Granier
name: Grau, N.
name: Greene, S. V.
name: Perdekamp, M. Grosse
name: Gunji, T.
name: Gustafsson, H. -Å.
name: Hachiya, T.
name: Henni, A. Hadj
name: Haggerty, J. S.
name: Hagiwara, M. N.
name: Hamagaki, H.
name: Harada, H.
name: Hartouni, E. P.
name: Haruna, K.
name: Harvey, M.
name: Haslum, E.
name: Hasuko, K.
name: Hayano, R.
name: He, X.
name: Heffner, M.
name: Hemmick, T. K.
name: Heuser, J. M.
name: Hiejima, H.
name: Hill, J. C.
name: Hobbs, R.
name: Holmes, M.
name: Holzmann, W.
name: Homma, K.
name: Hong, B.
name: Horaguchi, T.
name: Hur, M. G.
name: Ichihara, T.
name: Iinuma, H.
name: Imai, K.
name: Imrek, J.
name: Inaba, M.
name: Isenhower, D.
name: Isenhower, L.
name: Ishihara, M.
name: Isobe, T.
name: Issah, M.
name: Isupov, A.
name: Jacak, B. V.
name: Jia, J.
name: Jin, J.
name: Jinnouchi, O.
name: Johnson, B. M.
name: Joo, K. S.
name: Jouan, D.
name: Kajihara, F.
name: Kametani, S.
name: Kamihara, N.
name: Kaneta, M.
name: Kang, J. H.
name: Kawagishi, T.
name: Kazantsev, A. V.
name: Kelly, S.
name: Khanzadeev, A.
name: Kim, D. J.
name: Kim, E.
name: Kim, Y. -S.
name: Kinney, E.
name: Kiss, Á.
name: Kistenev, E.
name: Kiyomichi, A.
name: Klein-Boesing, C.
name: Kochenda, L.
name: Kochetkov, V.
name: Komkov, B.
name: Konno, M.
name: Kotchetkov, D.
name: Kozlov, A.
name: Kroon, P. J.
name: Kunde, G. J.
name: Kurihara, N.
name: Kurita, K.
name: Kweon, M. J.
name: Kwon, Y.
name: Kyle, G. S.
name: Lacey, R.
name: Lajoie, J. G.
name: Lebedev, A.
name: Bornec, Y. Le
name: Leckey, S.
name: Lee, D. M.
name: Lee, M. K.
name: Leitch, M. J.
name: Leite, M. A. L.
name: Li, X. H.
name: Lim, H.
name: Litvinenko, A.
name: Liu, M. X.
name: Maguire, C. F.
name: Makdisi, Y. I.
name: Malakhov, A.
name: Malik, M. D.
name: Manko, V. I.
name: Masui, H.
name: Matathias, F.
name: McCain, M. C.
name: McGaughey, P. L.
name: Miake, Y.
name: Miller, T. E.
name: Milov, A.
name: Mioduszewski, S.
name: Mishra, G. C.
name: Mitchell, J. T.
name: Morrison, D. P.
name: Moss, J. M.
name: Moukhanova, T. V.
name: Mukhopadhyay, D.
name: Murata, J.
name: Nagamiya, S.
name: Nagata, Y.
name: Nagle, J. L.
name: Naglis, M.
name: Nakamura, T.
name: Newby, J.
name: Nguyen, M.
name: Norman, B. E.
name: Nyanin, A. S.
name: Nystrand, J.
name: O'Brien, E.
name: Ogilvie, C. A.
name: Ohnishi, H.
name: Ojha, I. D.
name: Okada, K.
name: Omiwade, O. O.
name: Oskarsson, A.
name: Otterlund, I.
name: Ozawa, K.
name: Pal, D.
name: Palounek, A. P. T.
name: Pantuev, V.
name: Papavassiliou, V.
name: Park, J.
name: Park, W. J.
name: Pate, S. F.
name: Pei, H.
name: Peng, J. -C.
name: Pereira, H.
name: Peresedov, V.
name: Peressounko, D. Yu.
name: Pinkenburg, C.
name: Pisani, R. P.
name: Purschke, M. L.
name: Purwar, A. K.
name: Qu, H.
name: Rak, J.
name: Ravinovich, I.
name: Read, K. F.
name: Reuter, M.
name: Reygers, K.
name: Riabov, V.
name: Riabov, Y.
name: Roche, G.
name: Romana, A.
name: Rosati, M.
name: Rosendahl, S. S. E.
name: Rosnet, P.
name: Rukoyatkin, P.
name: Rykov, V. L.
name: Ryu, S. S.
name: Sahlmueller, B.
name: Saito, N.
name: Sakaguchi, T.
name: Sakai, S.
name: Samsonov, V.
name: Sato, H. D.
name: Sato, S.
name: Sawada, S.
name: Semenov, V.
name: Seto, R.
name: Sharma, D.
name: Shea, T. K.
name: Shein, I.
name: Shibata, T. -A.
name: Shigaki, K.
name: Shimomura, M.
name: Shohjoh, T.
name: Shoji, K.
name: Sickles, A.
name: Silva, C. L.
name: Silvermyr, D.
name: Sim, K. S.
name: Singh, C. P.
name: Singh, V.
name: Skutnik, S.
name: Smith, W. C.
name: Soldatov, A.
name: Soltz, R. A.
name: Sondheim, W. E.
name: Sorensen, S. P.
name: Sourikova, I. V.
name: Staley, F.
name: Stankus, P. W.
name: Stenlund, E.
name: Stepanov, M.
name: Ster, A.
name: Stoll, S. P.
name: Sugitate, T.
name: Suire, C.
name: Sullivan, J. P.
name: Sziklai, J.
name: Tabaru, T.
name: Takagi, S.
name: Takagui, E. M.
name: Taketani, A.
name: Tanaka, K. H.
name: Tanaka, Y.
name: Tanida, K.
name: Tannenbaum, M. J.
name: Taranenko, A.
name: Tarján, P.
name: Thomas, T. L.
name: Togawa, M.
name: Tojo, J.
name: Torii, H.
name: Towell, R. S.
name: Tram, V-N.
name: Tserruya, I.
name: Tsuchimoto, Y.
name: Tuli, S. K.
name: Tydesjö, H.
name: Tyurin, N.
name: Vale, C.
name: Valle, H.
name: van Hecke, H. W.
name: Velkovska, J.
name: Vértesi, R.
name: Vinogradov, A. A.
name: Vznuzdaev, E.
name: Wagner, M.
name: Wang, X. R.
name: Watanabe, Y.
name: Wessels, J.
name: White, S. N.
name: Willis, N.
name: Winter, D.
name: Woody, C. L.
name: Wysocki, M.
name: Xie, W.
name: Yanovich, A.
name: Yokkaichi, S.
name: Young, G. R.
name: Younus, I.
name: Yushmanov, I. E.
name: Zajc, W. A.
name: Zaudtke, O.
name: Zhang, C.
name: Zimányi, J.
name: Zolin, L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 &lt; p_T &lt; 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.
description: 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