/ Experiment-Nucl arXiv:1105.4126


Measurement of direct photon $v_2$ in $\sqrt{s_{NN}}=200$~GeV Au$+$Au collisions


Adare, A. (Colorado U.) ; Afanasiev, S. (Dubna, JINR) ; Aidala, C. (Massachusetts U., Amherst) ; Ajitanand, N.N. (SUNY, Stony Brook) ; Akiba, Y. (Brookhaven) ; Al-Bataineh, H. (New Mexico State U.) ; Alexander, J. (SUNY, Stony Brook) ; Aoki, K. (Nishina Ctr., RIKEN) ; Aramaki, Y. (Tokyo U.) ; Atomssa, E.T. (Ecole Polytechnique) ; Averbeck, R. (SUNY, Stony Brook) ; Awes, T.C. (Oak Ridge) ; Azmoun, B. (Brookhaven) ; Babintsev, V. (Serpukhov, IHEP) ; Bai, M. (Brookhaven) ; Baksay, G. (Florida Inst. Tech.) ; Baksay, L. (Florida Inst. Tech.) ; Barish, K.N. (UC, Riverside) ; Bassalleck, B. (New Mexico U.) ; Basye, A.T. (Abilene Christian U.) ; Bathe, S. (UC, Riverside) ; Baublis, V. (St. Petersburg, INP) ; Baumann, C. (Munster U.) ; Bazilevsky, A. (Brookhaven) ; Belikov, S. (Brookhaven) ; Belmont, R. (Vanderbilt U.) ; Bennett, R. (SUNY, Stony Brook) ; Berdnikov, A. (St. Petersburg Polytechnic Inst.) ; Berdnikov, Y. (St. Petersburg Polytechnic Inst.) ; Bickley, A.A. (Colorado U.) ; Bok, J.S. (Yonsei U.) ; Boyle, K. (SUNY, Stony Brook) ; Brooks, M.L. (Los Alamos) ; Buesching, H. (Brookhaven) ; Bumazhnov, V. (Serpukhov, IHEP) ; Bunce, G. (Brookhaven) ; Butsyk, S. (Los Alamos) ; Camacho, C.M. (Los Alamos) ; Campbell, S. (SUNY, Stony Brook) ; Chen, C.H. (SUNY, Stony Brook) ; Chi, C.Y. (Nevis Labs, Columbia U.) ; Chiu, M. (Brookhaven) ; Choi, I.J. (Yonsei U.) ; Choudhury, R.K. (Bhabha Atomic Res. Ctr.) ; Christiansen, P. (Lund U.) ; Chujo, T. (Tsukuba U.) ; Chung, P. (SUNY, Stony Brook) ; Chvala, O. (UC, Riverside) ; Cianciolo, V. (Oak Ridge) ; Citron, Z. (SUNY, Stony Brook) ; Cole, B.A. (Nevis Labs, Columbia U.) ; Connors, M. (SUNY, Stony Brook) ; Constantin, P. (Los Alamos) ; Csanad, M. (Eotvos U.) ; Csorgo, T. (Budapest, RMKI) ; Dahms, T. (SUNY, Stony Brook) ; Dairaku, S. (Nishina Ctr., RIKEN) ; Danchev, I. (Vanderbilt U.) ; Das, K. (Florida State U.) ; Datta, A. (Massachusetts U., Amherst) ; David, G. (Brookhaven) ; Denisov, A. (Serpukhov, IHEP) ; Deshpande, A. (SUNY, Stony Brook) ; Desmond, E.J. (Brookhaven) ; Dietzsch, O. (Sao Paulo U.) ; Dion, A. (SUNY, Stony Brook) ; Donadelli, M. (Sao Paulo U.) ; Drapier, O. (Ecole Polytechnique) ; Drees, A. (SUNY, Stony Brook) ; Drees, K.A. (Brookhaven) ; Durham, J.M. (SUNY, Stony Brook) ; Durum, A. (Serpukhov, IHEP) ; Dutta, D. (Bhabha Atomic Res. Ctr.) ; Edwards, S. (Florida State U.) ; Efremenko, Y.V. (Oak Ridge) ; Ellinghaus, F. (Colorado U.) ; Engelmore, T. (Nevis Labs, Columbia U.) ; Enokizono, A. (LLNL, Livermore) ; En'yo, H. (Brookhaven) ; Esumi, S. (Tsukuba U.) ; Fadem, B. (Muhlenberg Coll.) ; Fields, D.E. (New Mexico U.) ; Finger, M. (Charles U.) ; M.Finger, Jr. (Charles U.) ; Fleuret, F. (Ecole Polytechnique) ; Fokin, S.L. (Kurchatov Inst., Moscow) ; Fraenkel, Z. (Weizmann Inst.) ; Frantz, J.E. (SUNY, Stony Brook) ; Franz, A. (Brookhaven) ; Frawley, A.D. (Florida State U.) ; Fujiwara, K. (Nishina Ctr., RIKEN) ; Fukao, Y. (Nishina Ctr., RIKEN) ; Fusayasu, T. (Nagasaki Inst. Appl. Sci.) ; Garishvili, I. (Tennessee U.) ; Glenn, A. (Colorado U.) ; Gong, H. (SUNY, Stony Brook) ; Gonin, M. (Ecole Polytechnique) ; Goto, Y. (Brookhaven) ; Granier de Cassagnac, R. (Ecole Polytechnique) ; Grau, N. (Nevis Labs, Columbia U.) ; Greene, S.V. (Vanderbilt U.) ; Grosse Perdekamp, M. (Brookhaven) ; Gunji, T. (Tokyo U.) ; Gustafsson, H.A. (Lund U.) ; Haggerty, J.S. (Brookhaven) ; Hahn, K.I. (Ewha Women's U., Seoul) ; Hamagaki, H. (Tokyo U.) ; Hamblen, J. (Tennessee U.) ; Han, R. (Peking U.) ; Hanks, J. (Nevis Labs, Columbia U.) ; Hartouni, E.P. (LLNL, Livermore) ; Haslum, E. (Lund U.) ; Hayano, R. (Tokyo U.) ; He, X. (Georgia State U.) ; Heffner, M. (LLNL, Livermore) ; Hemmick, T.K. (SUNY, Stony Brook) ; Hester, T. (UC, Riverside) ; Hill, J.C. (Iowa State U.) ; Hohlmann, M. (Florida Inst. Tech.) ; Holzmann, W. (Nevis Labs, Columbia U.) ; Homma, K. (Hiroshima U.) ; Hong, B. (Korea U.) ; Horaguchi, T. (Hiroshima U.) ; Hornback, D. (Tennessee U.) ; Huang, S. (Vanderbilt U.) ; Ichihara, T. (Brookhaven) ; Ichimiya, R. (Nishina Ctr., RIKEN) ; Ide, J. (Muhlenberg Coll.) ; Ikeda, Y. (Tsukuba U.) ; Imai, K. (Nishina Ctr., RIKEN) ; Inaba, M. (Tsukuba U.) ; Isenhower, D. (Abilene Christian U.) ; Ishihara, M. (Nishina Ctr., RIKEN) ; Isobe, T. (Tokyo U.) ; Issah, M. (Vanderbilt U.) ; Isupov, A. (Dubna, JINR) ; Ivanischev, D. (St. Petersburg, INP) ; Jacak, B.V. (SUNY, Stony Brook) ; Jia, J. (SUNY, Stony Brook) ; Jin, J. (Nevis Labs, Columbia U.) ; Johnson, B.M. (Brookhaven) ; Joo, K.S. (Myong Ji U.) ; Jouan, D. (Orsay, IPN) ; Jumper, D.S. (Abilene Christian U.) ; Kajihara, F. (Tokyo U.) ; Kametani, S. (Nishina Ctr., RIKEN) ; Kamihara, N. (Brookhaven) ; Kamin, J. (SUNY, Stony Brook) ; Kang, J.H. (Yonsei U.) ; Kapustinsky, J. (Los Alamos) ; Karatsu, K. (Kyoto U.) ; Kawall, D. (Brookhaven) ; Kawashima, M. (Nishina Ctr., RIKEN) ; Kazantsev, A.V. (Kurchatov Inst., Moscow) ; Kempel, T. (Iowa State U.) ; Khanzadeev, A. (St. Petersburg, INP) ; Kijima, K.M. (Hiroshima U.) ; Kim, B.I. (Korea U.) ; Kim, D.H. (Myong Ji U.) ; Kim, D.J. (Helsinki Inst. of Phys.) ; Kim, E. (Seoul Natl. U.) ; Kim, E.J. (Chonbuk Natl. U.) ; Kim, S.H. (Yonsei U.) ; Kim, Y.J. (Illinois U., Urbana) ; Kinney, E. (Colorado U.) ; Kiriluk, K. (Colorado U.) ; Kiss, A. (Eotvos U.) ; Kistenev, E. (Brookhaven) ; Kochenda, L. (St. Petersburg, INP) ; Komkov, B. (St. Petersburg, INP) ; Konno, M. (Tsukuba U.) ; Koster, J. (Illinois U., Urbana) ; Kotchetkov, D. (New Mexico U.) ; Kozlov, A. (Weizmann Inst.) ; Kral, A. (Prague, Tech. U.) ; Kravitz, A. (Nevis Labs, Columbia U.) ; Kunde, G.J. (Los Alamos) ; Kurita, K. (Nishina Ctr., RIKEN) ; Kurosawa, M. (Nishina Ctr., RIKEN) ; Kwon, Y. (Yonsei U.) ; Kyle, G.S. (New Mexico State U.) ; Lacey, R. (SUNY, Stony Brook) ; Lai, Y.S. (Nevis Labs, Columbia U.) ; Lajoie, J.G. (Iowa State U.) ; Lebedev, A. (Iowa State U.) ; Lee, D.M. (Los Alamos) ; Lee, J. (Ewha Women's U., Seoul) ; Lee, K. (Seoul Natl. U.) ; Lee, K.B. (Korea U.) ; Lee, K.S. (Korea U.) ; Leitch, M.J. (Los Alamos) ; Leite, M.A.L. (Sao Paulo U.) ; Leitner, E. (Vanderbilt U.) ; Lenzi, B. (Sao Paulo U.) ; Li, X. (Beijing, Inst. Atomic Energy) ; Liebing, P. (Brookhaven) ; Levy, L.A.Linden (Colorado U.) ; Liska, T. (Prague, Tech. U.) ; Litvinenko, A. (Dubna, JINR) ; Liu, H. (New Mexico State U.) ; Liu, M.X. (Los Alamos) ; Love, B. (Vanderbilt U.) ; Luechtenborg, R. (Munster U.) ; Lynch, D. (Brookhaven) ; 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) ; Mannel, E. (Nevis Labs, Columbia U.) ; Mao, Y. (Nishina Ctr., RIKEN) ; Masui, H. (Tsukuba U.) ; Matathias, F. (Nevis Labs, Columbia U.) ; McCumber, M. (SUNY, Stony Brook) ; McGaughey, P.L. (Los Alamos) ; Means, N. (SUNY, Stony Brook) ; Meredith, B. (Illinois U., Urbana) ; Miake, Y. (Tsukuba U.) ; Mignerey, A.C. (Maryland U.) ; Mikes, P. (Prague, Inst. Plasma Phys.) ; Miki, K. (Tsukuba U.) ; Milov, A. (Brookhaven) ; Mishra, M. (Banaras Hindu U.) ; Mitchell, J.T. (Brookhaven) ; Mohanty, A.K. (Bhabha Atomic Res. Ctr.) ; Morino, Y. (Tokyo U.) ; Morreale, A. (UC, Riverside) ; Morrison, D.P. (Brookhaven) ; Moukhanova, T.V. (Kurchatov Inst., Moscow) ; Murata, J. (Nishina Ctr., RIKEN) ; Nagamiya, S. (KEK, Tsukuba) ; Nagle, J.L. (Colorado U.) ; Naglis, M. (Weizmann Inst.) ; Nagy, M.I. (Eotvos U.) ; Nakagawa, I. (Brookhaven) ; Nakamiya, Y. (Hiroshima U.) ; Nakamura, T. (KEK, Tsukuba) ; Nakano, K. (Tokyo Inst. Tech.) ; Newby, J. (LLNL, Livermore) ; Nguyen, M. (SUNY, Stony Brook) ; Nouicer, R. (Brookhaven) ; Nyanin, A.S. (Kurchatov Inst., Moscow) ; O'Brien, E. (Brookhaven) ; Oda, S.X. (Tokyo U.) ; Ogilvie, C.A. (Iowa State U.) ; Oka, M. (Tsukuba U.) ; Okada, K. (Brookhaven) ; Onuki, Y. (Nishina Ctr., RIKEN) ; Oskarsson, A. (Lund U.) ; Ouchida, M. (Hiroshima U.) ; Ozawa, K. (Tokyo U.) ; Pak, R. (Brookhaven) ; Pantuev, V. (SUNY, Stony Brook) ; Papavassiliou, V. (New Mexico State U.) ; Park, I.H. (Ewha Women's U., Seoul) ; Park, J. (Seoul Natl. U.) ; Park, S.K. (Korea 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) ; Proissl, M. (SUNY, Stony Brook) ; Purschke, M.L. (Brookhaven) ; Purwar, A.K. (Los Alamos) ; Qu, H. (Georgia State U.) ; Rak, J. (Helsinki Inst. of Phys.) ; Rakotozafindrabe, A. (Ecole Polytechnique) ; Ravinovich, I. (Weizmann Inst.) ; Read, K.F. (Tennessee U.) ; Reygers, K. (Munster U.) ; Riabov, V. (St. Petersburg, INP) ; Riabov, Y. (St. Petersburg, INP) ; Richardson, E. (Maryland U.) ; Roach, D. (Vanderbilt U.) ; Roche, G. (Clermont-Ferrand U.) ; Rolnick, S.D. (UC, Riverside) ; Rosati, M. (Iowa State U.) ; Rosen, C.A. (Colorado U.) ; Rosendahl, S.S.E. (Lund U.) ; Rosnet, P. (Clermont-Ferrand U.) ; Rukoyatkin, P. (Dubna, JINR) ; Ruzicka, P. (Prague, Inst. Plasma Phys.) ; Sahlmueller, B. (Munster U.) ; Saito, N. (KEK, Tsukuba) ; Sakaguchi, T. (Brookhaven) ; Sakashita, K. (Tokyo Inst. Tech.) ; Samsonov, V. (St. Petersburg, INP) ; Sano, S. (Waseda U.) ; Sato, T. (Tsukuba U.) ; Sawada, S. (KEK, Tsukuba) ; Sedgwick, K. (UC, Riverside) ; Seele, J. (Colorado U.) ; Seidl, R. (Illinois U., Urbana) ; Semenov, A.Yu. (Iowa State U.) ; Seto, R. (UC, Riverside) ; Sharma, D. (Weizmann Inst.) ; Shein, I. (Serpukhov, IHEP) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Shigaki, K. (Hiroshima U.) ; Shimomura, M. (Tsukuba U.) ; Shoji, K. (Nishina Ctr., RIKEN) ; Shukla, P. (Bhabha Atomic Res. Ctr.) ; Sickles, A. (Brookhaven) ; Silva, C.L. (Sao Paulo U.) ; Silvermyr, D. (Oak Ridge) ; Silvestre, C. (DAPNIA, Saclay) ; Sim, K.S. (Korea U.) ; Singh, B.K. (Banaras Hindu U.) ; Singh, C.P. (Banaras Hindu U.) ; Singh, V. (Banaras Hindu U.) ; Slunecka, M. (Charles U.) ; Soltz, R.A. (LLNL, Livermore) ; Sondheim, W.E. (Los Alamos) ; Sorensen, S.P. (Tennessee U.) ; Sourikova, I.V. (Brookhaven) ; Sparks, N.A. (Abilene Christian U.) ; Stankus, P.W. (Oak Ridge) ; Stenlund, E. (Lund U.) ; Stoll, S.P. (Brookhaven) ; Sugitate, T. (Hiroshima U.) ; Sukhanov, A. (Brookhaven) ; Sziklai, J. (Budapest, RMKI) ; Takagui, E.M. (Sao Paulo U.) ; Taketani, A. (Brookhaven) ; Tanabe, R. (Tsukuba U.) ; Tanaka, Y. (Nagasaki Inst. Appl. Sci.) ; Tanida, K. (Brookhaven) ; Tannenbaum, M.J. (Brookhaven) ; Tarafdar, S. (Banaras Hindu U.) ; Taranenko, A. (SUNY, Stony Brook) ; Tarjan, P. (Debrecen U.) ; Themann, H. (SUNY, Stony Brook) ; Thomas, T.L. (New Mexico U.) ; Togawa, M. (Nishina Ctr., RIKEN) ; Toia, A. (SUNY, Stony Brook) ; Tomasek, L. (Prague, Inst. Plasma Phys.) ; Torii, H. (Hiroshima U.) ; Towell, R.S. (Abilene Christian U.) ; Tserruya, I. (Weizmann Inst.) ; Tsuchimoto, Y. (Hiroshima U.) ; Vale, C. (Iowa State U.) ; Valle, H. (Vanderbilt U.) ; van Hecke, H.W. (Los Alamos) ; Vazquez-Zambrano, E. (Nevis Labs, Columbia U.) ; Veicht, A. (Illinois U., Urbana) ; Velkovska, J. (Vanderbilt U.) ; Vertesi, R. (Budapest, RMKI) ; Vinogradov, A.A. (Kurchatov Inst., Moscow) ; Virius, M. (Prague, Tech. U.) ; Vrba, V. (Prague, Inst. Plasma Phys.) ; Vznuzdaev, E. (St. Petersburg, INP) ; Wang, X.R. (New Mexico State U.) ; Watanabe, D. (Hiroshima U.) ; Watanabe, K. (Tsukuba U.) ; Watanabe, Y. (Brookhaven) ; Wei, F. (Iowa State U.) ; Wei, R. (SUNY, Stony Brook) ; Wessels, J. (Munster U.) ; White, S.N. (Brookhaven) ; Winter, D. (Nevis Labs, Columbia U.) ; Wood, J.P. (Abilene Christian U.) ; Woody, C.L. (Brookhaven) ; Wright, R.M. (Abilene Christian U.) ; Wysocki, M. (Colorado U.) ; Xie, W. (Brookhaven) ; Yamaguchi, Y.L. (Tokyo U.) ; Yamaura, K. (Hiroshima U.) ; Yang, R. (Illinois U., Urbana) ; Yanovich, A. (Serpukhov, IHEP) ; Ying, J. (Georgia State U.) ; Yokkaichi, S. (Brookhaven) ; You, Z. (Peking U.) ; Young, G.R. (Oak Ridge) ; Younus, I. (New Mexico U.) ; Yushmanov, I.E. (Kurchatov Inst., Moscow) ; Zajc, W.A. (Nevis Labs, Columbia U.) ; Zhang, C. (Oak Ridge) ; Zhou, S. (Beijing, Inst. Atomic Energy) ; Zolin, L. (Dubna, JINR)

Pages: 6

Abstract: The second Fourier component v_2 of the azimuthal anisotropy with respect to the reaction plane has been measured for direct photons at midrapidity and transverse momentum (p_T) of 1.15 GeV/c in Au+Au collisions at sqr(s_NN)=200 GeV. Previous measurements of this quantity for hadrons with p_T < 6 GeV/c indicate that the medium behaves as a nearly perfect fluid, while for p_T > 6 GeV/c a reduced anisotropy is interpreted in terms of a path-length dependence for parton energy loss. In this measurement we find that for p_T > 4 GeV/c, the anisotropy for direct photons is consistent with zero and current uncertainties prevent a conclusive test of predicted small v_2 values from jet conversion and fragmentation photons. However, in the p_T < 4 GeV/c region, dominated by thermal photons, we find a substantial direct photon v_2 comparable to that of hadrons, whereas model calculations for thermal photons in this kinematic region significantly underpredict the observed v_2.


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