Observation of direct-photon collective flow in sqrt(s_NN)=200 GeV Au+Au collisions
Creators: name: Adare, A.
name: Afanasiev, S.
name: Aidala, C.
name: Ajitanand, N. N.
name: Akiba, Y.
name: Al-Bataineh, H.
name: Alexander, J.
name: Aoki, K.
name: Aramaki, Y.
name: Atomssa, E. T.
name: Averbeck, R.
name: Awes, T. C.
name: Azmoun, B.
name: Babintsev, V.
name: Bai, M.
name: Baksay, G.
name: Baksay, L.
name: Barish, K. N.
name: Bassalleck, B.
name: Basye, A. T.
name: Bathe, S.
name: Baublis, V.
name: Baumann, C.
name: Bazilevsky, A.
name: Belikov, S.
name: Belmont, R.
name: Bennett, R.
name: Berdnikov, A.
name: Berdnikov, Y.
name: Bickley, A. A.
name: Bok, J. S.
name: Boyle, K.
name: Brooks, M. L.
name: Buesching, H.
name: Bumazhnov, V.
name: Bunce, G.
name: Butsyk, S.
name: Camacho, C. M.
name: Campbell, S.
name: Chen, C. -H.
name: Chi, C. Y.
name: Chiu, M.
name: Choi, I. J.
name: Choudhury, R. K.
name: Christiansen, P.
name: Chujo, T.
name: Chung, P.
name: Chvala, O.
name: Cianciolo, V.
name: Citron, Z.
name: Cole, B. A.
name: Connors, M.
name: Constantin, P.
name: Csanád, M.
name: Csörgő, T.
name: Dahms, T.
name: Dairaku, S.
name: Danchev, I.
name: Das, K.
name: Datta, A.
name: David, G.
name: Denisov, A.
name: Deshpande, A.
name: Desmond, E. J.
name: Dietzsch, O.
name: Dion, A.
name: Donadelli, M.
name: Drapier, O.
name: Drees, A.
name: Drees, K. A.
name: Durham, J. M.
name: Durum, A.
name: Dutta, D.
name: Edwards, S.
name: Efremenko, Y. V.
name: Ellinghaus, F.
name: Engelmore, T.
name: Enokizono, A.
name: En'yo, H.
name: Esumi, S.
name: Fadem, B.
name: Fields, D. E.
name: Finger, M.
name: Finger, M.
name: Fleuret, F.
name: Fokin, S. L.
name: Fraenkel, Z.
name: Frantz, J. E.
name: Franz, A.
name: Frawley, A. D.
name: Fujiwara, K.
name: Fukao, Y.
name: Fusayasu, T.
name: Garishvili, I.
name: Glenn, A.
name: Gong, H.
name: Gonin, M.
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: Haggerty, J. S.
name: Hahn, K. I.
name: Hamagaki, H.
name: Hamblen, J.
name: Han, R.
name: Hanks, J.
name: Hartouni, E. P.
name: Haslum, E.
name: Hayano, R.
name: He, X.
name: Heffner, M.
name: Hemmick, T. K.
name: Hester, T.
name: Hill, J. C.
name: Hohlmann, M.
name: Holzmann, W.
name: Homma, K.
name: Hong, B.
name: Horaguchi, T.
name: Hornback, D.
name: Huang, S.
name: Ichihara, T.
name: Ichimiya, R.
name: Ide, J.
name: Ikeda, Y.
name: Imai, K.
name: Inaba, M.
name: Isenhower, D.
name: Ishihara, M.
name: Isobe, T.
name: Issah, M.
name: Isupov, A.
name: Ivanischev, D.
name: Jacak, B. V.
name: Jia, J.
name: Jin, J.
name: Johnson, B. M.
name: Joo, K. S.
name: Jouan, D.
name: Jumper, D. S.
name: Kajihara, F.
name: Kametani, S.
name: Kamihara, N.
name: Kamin, J.
name: Kang, J. H.
name: Kapustinsky, J.
name: Karatsu, K.
name: Kawall, D.
name: Kawashima, M.
name: Kazantsev, A. V.
name: Kempel, T.
name: Khanzadeev, A.
name: Kijima, K. M.
name: Kim, B. I.
name: Kim, D. H.
name: Kim, D. J.
name: Kim, E.
name: Kim, E. J.
name: Kim, S. H.
name: Kim, Y. J.
name: Kinney, E.
name: Kiriluk, K.
name: Kiss, Á.
name: Kistenev, E.
name: Kochenda, L.
name: Komkov, B.
name: Konno, M.
name: Koster, J.
name: Kotchetkov, D.
name: Kozlov, A.
name: Král, A.
name: Kravitz, A.
name: Kunde, G. J.
name: Kurita, K.
name: Kurosawa, M.
name: Kwon, Y.
name: Kyle, G. S.
name: Lacey, R.
name: Lai, Y. S.
name: Lajoie, J. G.
name: Lebedev, A.
name: Lee, D. M.
name: Lee, J.
name: Lee, K.
name: Lee, K. B.
name: Lee, K. S.
name: Leitch, M. J.
name: Leite, M. A. L.
name: Leitner, E.
name: Lenzi, B.
name: Li, X.
name: Liebing, P.
name: Levy, L. A. Linden
name: Liška, T.
name: Litvinenko, A.
name: Liu, H.
name: Liu, M. X.
name: Love, B.
name: Luechtenborg, R.
name: Lynch, D.
name: Maguire, C. F.
name: Makdisi, Y. I.
name: Malakhov, A.
name: Malik, M. D.
name: Manko, V. I.
name: Mannel, E.
name: Mao, Y.
name: Masui, H.
name: Matathias, F.
name: McCumber, M.
name: McGaughey, P. L.
name: Means, N.
name: Meredith, B.
name: Miake, Y.
name: Mignerey, A. C.
name: Mikeš, P.
name: Miki, K.
name: Milov, A.
name: Mishra, M.
name: Mitchell, J. T.
name: Mohanty, A. K.
name: Morino, Y.
name: Morreale, A.
name: Morrison, D. P.
name: Moukhanova, T. V.
name: Murata, J.
name: Nagamiya, S.
name: Nagle, J. L.
name: Naglis, M.
name: Nagy, M. I.
name: Nakagawa, I.
name: Nakamiya, Y.
name: Nakamura, T.
name: Nakano, K.
name: Newby, J.
name: Nguyen, M.
name: Nouicer, R.
name: Nyanin, A. S.
name: O'Brien, E.
name: Oda, S. X.
name: Ogilvie, C. A.
name: Oka, M.
name: Okada, K.
name: Onuki, Y.
name: Oskarsson, A.
name: Ouchida, M.
name: Ozawa, K.
name: Pak, R.
name: Pantuev, V.
name: Papavassiliou, V.
name: Park, I. H.
name: Park, J.
name: Park, S. K.
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: Proissl, M.
name: Purschke, M. L.
name: Purwar, A. K.
name: Qu, H.
name: Rak, J.
name: Rakotozafindrabe, A.
name: Ravinovich, I.
name: Read, K. F.
name: Reygers, K.
name: Riabov, V.
name: Riabov, Y.
name: Richardson, E.
name: Roach, D.
name: Roche, G.
name: Rolnick, S. D.
name: Rosati, M.
name: Rosen, C. A.
name: Rosendahl, S. S. E.
name: Rosnet, P.
name: Rukoyatkin, P.
name: Ružička, P.
name: Sahlmueller, B.
name: Saito, N.
name: Sakaguchi, T.
name: Sakashita, K.
name: Samsonov, V.
name: Sano, S.
name: Sato, T.
name: Sawada, S.
name: Sedgwick, K.
name: Seele, J.
name: Seidl, R.
name: Semenov, A. Yu.
name: Seto, R.
name: Sharma, D.
name: Shein, I.
name: Shibata, T. -A.
name: Shigaki, K.
name: Shimomura, M.
name: Shoji, K.
name: Shukla, P.
name: Sickles, A.
name: Silva, C. L.
name: Silvermyr, D.
name: Silvestre, C.
name: Sim, K. S.
name: Singh, B. K.
name: Singh, C. P.
name: Singh, V.
name: Slunečka, M.
name: Soltz, R. A.
name: Sondheim, W. E.
name: Sorensen, S. P.
name: Sourikova, I. V.
name: Sparks, N. A.
name: Stankus, P. W.
name: Stenlund, E.
name: Stoll, S. P.
name: Sugitate, T.
name: Sukhanov, A.
name: Sziklai, J.
name: Takagui, E. M.
name: Taketani, A.
name: Tanabe, R.
name: Tanaka, Y.
name: Tanida, K.
name: Tannenbaum, M. J.
name: Tarafdar, S.
name: Taranenko, A.
name: Tarján, P.
name: Themann, H.
name: Thomas, T. L.
name: Togawa, M.
name: Toia, A.
name: Tomášek, L.
name: Torii, H.
name: Towell, R. S.
name: Tserruya, I.
name: Tsuchimoto, Y.
name: Vale, C.
name: Valle, H.
name: van Hecke, H. W.
name: Vazquez-Zambrano, E.
name: Veicht, A.
name: Velkovska, J.
name: Vértesi, R.
name: Vinogradov, A. A.
name: Virius, M.
name: Vrba, V.
name: Vznuzdaev, E.
name: Wang, X. R.
name: Watanabe, D.
name: Watanabe, K.
name: Watanabe, Y.
name: Wei, F.
name: Wei, R.
name: Wessels, J.
name: White, S. N.
name: Winter, D.
name: Wood, J. P.
name: Woody, C. L.
name: Wright, R. M.
name: Wysocki, M.
name: Xie, W.
name: Yamaguchi, Y. L.
name: Yamaura, K.
name: Yang, R.
name: Yanovich, A.
name: Ying, J.
name: Yokkaichi, S.
name: You, Z.
name: Young, G. R.
name: Younus, I.
name: Yushmanov, I. E.
name: Zajc, W. A.
name: Zhang, C.
name: Zhou, S.
name: Zolin, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The second Fourier component v_2 of the azimuthal anisotropy with respect to the reaction plane was measured for direct photons at midrapidity and transverse momentum (p_T) of 1--13 GeV/c in Au+Au collisions at sqr(s_NN)=200 GeV. Previous measurements of this quantity for hadrons with p_T &lt; 6 GeV/c indicate that the medium behaves like a nearly perfect fluid, while for p_T &gt; 6 GeV/c a reduced anisotropy is interpreted in terms of a path-length dependence for parton energy loss. In this measurement with the PHENIX detector at the Relativistic Heavy Ion Collider we find that for p_T &gt; 4 GeV/c the anisotropy for direct photons is consistent with zero, as expected if the dominant source of direct photons is initial hard scattering. However, in the p_T &lt; 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.
description: 384 authors, 6 pages, 3 figures, and 1 table. Submitted to Phys. Rev. Lett. v2 has minor changes to match the submission version. Plain text data tables for the points plotted in the figures are publicly available at http://www.phenix.bnl.gov/phenix/WWW/info/data/ppg126_data.html