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Observation of Direct-Photon Collective Flow in Au plus Au Collisions at root s(NN)=200 GeV

Title
Observation of Direct-Photon Collective Flow in Au plus Au Collisions at root s(NN)=200 GeV
Authors
Adare, A.Afanasiev, S.Aidala, C.Ajitanand, N. N.Akiba, Y.Al-Bataineh, H.Alexander, J.Aoki, K.Aramaki, Y.Atomssa, E. T.Averbeck, R.Awes, T. C.Azmoun, B.Babintsev, V.Bai, M.Baksay, G.Baksay, L.Barish, K. N.Bassalleck, B.Basye, A. T.Bathe, S.Baublis, V.Baumann, C.Bazilevsky, A.Belikov, S.Belmont, R.Bennett, R.Berdnikov, A.Berdnikov, Y.Bickley, A. A.Bok, J. S.Boyle, K.Brooks, M. L.Buesching, H.Bumazhnov, V.Bunce, G.Butsyk, S.Camacho, C. M.Campbell, S.Chen, C. -H.Chi, C. Y.Chiu, M.Choi, I. J.Choudhury, R. K.Christiansen, P.Chujo, T.Chung, P.Chvala, O.Cianciolo, V.Citron, Z.Cole, B. A.Connors, M.Constantin, P.Csanad, M.Csoergo, T.Dahms, T.Dairaku, S.Danchev, I.Das, K.Datta, A.David, G.Denisov, A.Deshpande, A.Desmond, E. J.Dietzsch, O.Dion, A.Donadelli, M.Drapier, O.Drees, A.Drees, K. A.Durham, J. M.Durum, A.Dutta, D.Edwards, S.Efremenko, Y. V.Ellinghaus, F.Engelmore, T.Enokizono, A.En'yo, H.Esumi, S.Fadem, B.Fields, D. E.Finger, M.Finger, M., Jr.Fleuret, F.Fokin, S. L.Fraenkel, Z.Frantz, J. E.Franz, A.Frawley, A. D.Fujiwara, K.Fukao, Y.Fusayasu, T.Garishvili, I.Glenn, A.Gong, H.Gonin, M.Goto, Y.de Cassagnac, R. GranierGrau, N.Greene, S. V.Perdekamp, M. GrosseGunji, T.Gustafsson, H. -A.Haggerty, J. S.Hahn, K. I.Hamagaki, H.Hamblen, J.Han, R.Hanks, J.Hartouni, E. P.Haslum, E.Hayano, R.He, X.Heffner, M.Hemmick, T. K.Hester, T.Hill, J. C.Hohlmann, M.Holzmann, W.Homma, K.Hong, B.Horaguchi, T.Hornback, D.Huang, S.Ichihara, T.Ichimiya, R.Ide, J.Ikeda, Y.Imai, K.Inaba, M.Isenhower, D.Ishihara, M.Isobe, T. 010 050Issah, M.Isupov, A.Ivanischev, D.Jacak, B. V.Jia, J.Jin, J.Johnson, B. M.Joo, K. S.Jouan, D.Jumper, D. S.Kajihara, F.Kametani, S.Kamihara, N.Kamin, J.Kang, J. H.Kapustinsky, J.Karatsu, K.Kawall, D.Kawashima, M.Kazantsev, A. V.Kempel, T.Khanzadeev, A.Kijima, K. M.Kim, B. I.Kim, D. H.Kim, D. J.Kim, E.Kim, E. J.Kim, S. H.Kim, Y. J.Kinney, E.Kiriluk, K.Kiss, A.Kistenev, E.Klein-Boesing, C.Kochenda, L.Komkov, B.Konno, M.Koster, J.Kotchetkov, D.Kozlov, A.Kral, A.Kravitz, A.Kunde, G. J.Kurita, K.Kurosawa, M.Kwon, Y.Kyle, G. S.Lacey, R.Lai, Y. S.Lajoie, J. G.Lebedev, A.Lee, D. M.Lee, J.Lee, K.Lee, K. B.Lee, K. S.Leitch, M. J.Leite, M. A. L.Leitner, E.Lenzi, B. 054Li, X.Liebing, P.Levy, L. A. LindenLiska, T.Litvinenko, A.Liu, H.Liu, M. X.Love, B.Luechtenborg, R.Lynch, D.Maguire, C. F.Makdisi, Y. I.Malakhov, A.Malik, M. D.Manko, V. I.Mannel, E.Mao, Y.Masui, H.Matathias, F.McCumber, M.McGaughey, P. L.Means, N.Meredith, B.Miake, Y.Mignerey, A. C.Mikes, P.Miki, K.Milov, A.Mishra, M.Mitchell, J. T.Mohanty, A. K.Morino, Y.Morreale, A.Morrison, D. P.Moukhanova, T. V.Murata, J.Nagamiya, S.Nagle, J. L.Naglis, M.Nagy, M. I.Nakagawa, I.Nakamiya, Y.Nakamura, T.Nakano, K.Newby, J.Nguyen, M.Nouicer, R.Nyanin, A. S.O'Brien, E.Oda, S. X.Ogilvie, C. A.Oka, M.Okada, K.Onuki, Y.Oskarsson, A.Ouchida, M.Ozawa, K.Pak, R.Pantuev, V.Papavassiliou, V.Park, I. H.Park, J.Park, S. K.Park, W. J.Pate, S. F.Pei, H.Peng, J. -C.Pereira, H.Peresedov, V.Peressounko, D. Yu.Pinkenburg, C.Pisani, R. P.Proissl, M.Purschke, M. L.Purwar, A. K.Qu, H.Rak, J.Rakotozafindrabe, A.Ravinovich, I.Read, K. F.Reygers, K.Riabov, V.Riabov, Y.Richardson, E.Roach, D.Roche, G.Rolnick, S. D.Rosati, M.Rosen, C. A.Rosendahl, S. S. E.Rosnet, P.Rukoyatkin, P.Ruzicka, P.Sahlmueller, B.Saito, N.Sakaguchi, T.Sakashita, K.Samsonov, V.Sano, S.Sato, T.Sawada, S.Sedgwick, K.Seele, J.Seidl, R.Semenov, A. Yu.Seto, R.Sharma, D.Shein, I.Shibata, T. -A.Shigaki, K.Shimomura, M.Shoji, K.Shukla, P.Sickles, A.Silva, C. L.Silvermyr, D.Silvestre, C.Sim, K. S.Singh, B. K.Singh, C. P.Singh, V.Slunecka, M.Soltz, R. A.Sondheim, W. E.Sorensen, S. P.Sourikova, I. V.Sparks, N. A.Stankus, P. W.Stenlund, E.Stoll, S. P.Sugitate, T.Sukhanov, A.Sziklai, J.Takagui, E. M.Taketani, A.Tanabe, R.Tanaka, Y.Tanida, K.Tannenbaum, M. J.Tarafdar, S.Taranenko, A.Tarjan, P.Themann, H.Thomas, T. L.Togawa, M.Toia, A.Tomasek, L.Torii, H.Towell, R. S.Tserruya, I.Tsuchimoto, Y.Vale, C.Valle, H.Van Hecke, H. W.Vazquez-Zambrano, E.Veicht, A.Velkovska, J.Vertesi, R.Vinogradov, A. A.Virius, M.Vrba, V.Vznuzdaev, E.Wang, X. R.Watanabe, D.Watanabe, K.Watanabe, Y.Wei, F.Wei, R.Wessels, J.White, S. N.Winter, D.Wood, J. P.Woody, C. L.Wright, R. M.Wysocki, M.Xie, W.Yamaguchi, Y. L.Yamaura, K.Yang, R.Yanovich, A.Ying, J.Yokkaichi, S.You, Z.Young, G. R.Younus, I.Yushmanov, I. E.Zajc, W. A.Zhang, C.Zhou, S.Zolin, L.PHENIX Collaboration
Ewha Authors
한인식박일흥
SCOPUS Author ID
한인식scopus
Issue Date
2012
Journal Title
PHYSICAL REVIEW LETTERS
ISSN
0031-9007JCR Link
Citation
vol. 109, no. 12
Publisher
AMER PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
The second Fourier component v(2) of the azimuthal anisotropy with respect to the reaction plane is measured for direct photons at midrapidity and transverse momentum (p(T)) of 1-12 GeV/c in Au + Au collisions at root s(NN) = 200 GeV. Previous measurements of this quantity for hadrons with p(T) < 6 GeV/c indicate that the medium behaves like 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 with the PHENIX detector at the Relativistic Heavy Ion Collider we find that for p(T) > 4 GeV/c the anisotropy for direct photons is consistent with zero, which is as expected if the dominant source of direct photons is initial hard scattering. 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 underpredict the observed v(2).
DOI
10.1103/PhysRevLett.109.122302
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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