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

Author(s):Show less -

Adare, A. ^[1] ; Afanasiev, S. ^[2] ; Aidala, C. ^[3] ; Ajitanand, N. N. ^[4] ; Akiba, Y. ^{[5, 6]} ; Al-Bataineh, H. ^[7] ; Alexander, J. ^[4] ; Aoki, K. ^{[8, 6]} ; Aramaki, Y. ^[9] ; Atomssa, E. T. ^[10] ; Averbeck, R. ^[11] ; Awes, T. C. ^[12] ; Azmoun, B. ^[13] ; Babintsev, V. ^[14] ; Bai, M. ^[15] ; Baksay, G. ^[16] ; Baksay, L. ^[16] ; Barish, K. N. ^[17] ; Bassalleck, B. ^[18] ; Basye, A. T. ^[19] ; Bathe, S. ^[17] ; Baublis, V. ^[20] ; Baumann, C. ^[21] ; Bazilevsky, A. ^[13] ; Belikov, S. ^[13] ; Belmont, R. ^[22] ; Bennett, R. ^[11] ; Berdnikov, A. ^[23] ; Berdnikov, Y. ^[23] ; Bickley, A. A. ^[1] ; Bok, J. S. ^[24] ; Boyle, K. ^[11] ; Brooks, M. L. ^[25] ; Buesching, H. ^[13] ; Bumazhnov, V. ^[14] ; Bunce, G. ^{[13, 5]} ; Butsyk, S. ^[25] ; Camacho, C. M. ^[25] ; Campbell, S. ^[11] ; Chen, C. -H. ^[11] ; Chi, C. Y. ^{[26, 27]} ; Chiu, M. ^[13] ; Choi, I. J. ^[24] ; Choudhury, R. K. ^[28] ; Christiansen, P. ^[29] ; Chujo, T. ^[30] ; Chung, P. ^[4] ; Chvala, O. ^[17] ; Cianciolo, V. ^[12] ; Citron, Z. ^[11] ; Cole, B. A. ^{[26, 27]} ; Connors, M. ^[11] ; Constantin, P. ^[25] ; Csanad, M. ^[31] ; Csoergo, T. ^[32] ; Dahms, T. ^[11] ; Dairaku, S. ^{[8, 6]} ; Danchev, I. ^[22] ; Das, K. ^[33] ; Datta, A. ^[3] ; David, G. ^[13] ; Denisov, A. ^[14] ; Deshpande, A. ^{[11, 5]} ; Desmond, E. J. ^[13] ; Dietzsch, O. ^[34] ; Dion, A. ^[11] ; Donadelli, M. ^[34] ; Drapier, O. ^[10] ; Drees, A. ^[11] ; Drees, K. A. ^[15] ; Durham, J. M. ^[11] ; Durum, A. ^[14] ; Dutta, D. ^[28] ; Edwards, S. ^[33] ; Efremenko, Y. V. ^[12] ; Ellinghaus, F. ^[1] ; Engelmore, T. ^{[26, 27]} ; Enokizono, A. ^[35] ; En'yo, H. ^{[5, 6]} ; Esumi, S. ^[30] ; Fadem, B. ^[36] ; Fields, D. E. ^[18] ; Finger, M. ^[37] ; Finger, Jr., M. ^[37] ; Fleuret, F. ^[10] ; Fokin, S. L. ^[38] ; Fraenkel, Z. ^[39] ; Frantz, J. E. ^[11] ; Franz, A. ^[13] ; Frawley, A. D. ^[33] ; Fujiwara, K. ^[6] ; Fukao, Y. ^[6] ; Fusayasu, T. ^[40] ; Garishvili, I. ^[41] ; Glenn, A. ^[1] ; Gong, H. ^[11] ; Gonin, M. ^[10] ; Goto, Y. ^{[5, 6]} ; de Cassagnac, R. Granier ^[10] ; Grau, N. ^{[26, 27]} ; Greene, S. V. ^[22] ; Perdekamp, M. Grosse ^{[42, 5]} ; Gunji, T. ^[9] ; Gustafsson, H. -A. ^[29] ; Haggerty, J. S. ^[13] ; Hahn, K. I. ^[43] ; Hamagaki, H. ^[9] ; Hamblen, J. ^[41] ; Han, R. ^[44] ; Hanks, J. ^{[26, 27]} ; Hartouni, E. P. ^[35] ; Haslum, E. ^[29] ; Hayano, R. ^[9] ; He, X. ^[45] ; Heffner, M. ^[35] ; Hemmick, T. K. ^[11] ; Hester, T. ^[17] ; Hill, J. C. ^[46] ; Hohlmann, M. ^[16] ; Holzmann, W. ^{[26, 27]} ; Homma, K. ^[47] ; Hong, B. ^[48] ; Horaguchi, T. ^[47] ; Hornback, D. ^[41] ; Huang, S. ^[22] ; Ichihara, T. ^{[5, 6]} ; Ichimiya, R. ^[6] ; Ide, J. ^[36] ; Ikeda, Y. ^[30] ; Imai, K. ^{[8, 6]} ; Inaba, M. ^[30] ; Isenhower, D. ^[19] ; Ishihara, M. ^[6] ; Isobe, T. ^{[9, 6]} ; Issah, M. ^[22] ; Isupov, A. ^[2] ; Ivanischev, D. ^[20] ; Jacak, B. V. ^[11] ; Jia, J. ^{[13, 4]} ; Jin, J. ^{[26, 27]} ; Johnson, B. M. ^[13] ; Joo, K. S. ^[49] ; Jouan, D. ^[50] ; Jumper, D. S. ^[19] ; Kajihara, F. ^[9] ; Kametani, S. ^[6] ; Kamihara, N. ^[5] ; Kamin, J. ^[11] ; Kang, J. H. ^[24] ; Kapustinsky, J. ^[25] ; Karatsu, K. ^{[8, 6]} ; Kawall, D. ^{[3, 5]} ; Kawashima, M. ^{[51, 6]} ; Kazantsev, A. V. ^[38] ; Kempel, T. ^[46] ; Khanzadeev, A. ^[20] ; Kijima, K. M. ^[47] ; Kim, B. I. ^[48] ; Kim, D. H. ^[49] ; Kim, D. J. ^{[52, 53]} ; Kim, E. ^[54] ; Kim, E. J. ^[55] ; Kim, S. H. ^[24] ; Kim, Y. J. ^[42] ; Kinney, E. ^[1] ; Kiriluk, K. ^[1] ; Kiss, A. ^[31] ; Kistenev, E. ^[13] ; Klein-Boesing, C. ^[21] ; Kochenda, L. ^[20] ; Komkov, B. ^[20] ; Konno, M. ^[30] ; Koster, J. ^[42] ; Kotchetkov, D. ^[18] ; Kozlov, A. ^[39] ; Kral, A. ^[56] ; Kravitz, A. ^{[26, 27]} ; Kunde, G. J. ^[25] ; Kurita, K. ^{[51, 6]} ; Kurosawa, M. ^[6] ; Kwon, Y. ^[24] ; Kyle, G. S. ^[7] ; Lacey, R. ^[4] ; Lai, Y. S. ^{[26, 27]} ; Lajoie, J. G. ^[46] ; Lebedev, A. ^[46] ; Lee, D. M. ^[25] ; Lee, J. ^[43] ; Lee, K. ^[54] ; Lee, K. B. ^[48] ; Lee, K. S. ^[48] ; Leitch, M. J. ^[25] ; Leite, M. A. L. ^[34] ; Leitner, E. ^[22] ; Lenzi, B. ^[34] ; Li, X. ^[57] ; Liebing, P. ^[5] ; Levy, L. A. Linden ^[1] ; Liska, T. ^[56] ; Litvinenko, A. ^[2] ; Liu, H. ^{[25, 7]} ; Liu, M. X. ^[25] ; Love, B. ^[22] ; Luechtenborg, R. ^[21] ; Lynch, D. ^[13] ; Maguire, C. F. ^[22] ; Makdisi, Y. I. ^[15] ; Malakhov, A. ^[2] ; Malik, M. D. ^[18] ; Manko, V. I. ^[38] ; Mannel, E. ^{[26, 27]} ; Mao, Y. ^{[44, 6]} ; Masui, H. ^[30] ; Matathias, F. ^{[26, 27]} ; McCumber, M. ^[11] ; McGaughey, P. L. ^[25] ; Means, N. ^[11] ; Meredith, B. ^[42] ; Miake, Y. ^[30] ; Mignerey, A. C. ^[58] ; Mikes, P. ^{[59, 37]} ; Miki, K. ^{[30, 6]} ; Milov, A. ^[13] ; Mishra, M. ^[60] ; Mitchell, J. T. ^[13] ; Mohanty, A. K. ^[28] ; Morino, Y. ^[9] ; Morreale, A. ^[17] ; Morrison, D. P. ^[13] ; Moukhanova, T. V. ^[38] ; Murata, J. ^{[51, 6]} ; Nagamiya, S. ^[61] ; Nagle, J. L. ^[1] ; Naglis, M. ^[39] ; Nagy, M. I. ^[31] ; Nakagawa, I. ^{[5, 6]} ; Nakamiya, Y. ^[47] ; Nakamura, T. ^{[47, 61]} ; Nakano, K. ^{[62, 6]} ; Newby, J. ^[35] ; Nguyen, M. ^[11] ; Nouicer, R. ^[13] ; Nyanin, A. S. ^[38] ; O'Brien, E. ^[13] ; Oda, S. X. ^[9] ; Ogilvie, C. A. ^[46] ; Oka, M. ^[30] ; Okada, K. ^[5] ; Onuki, Y. ^[6] ; Oskarsson, A. ^[29] ; Ouchida, M. ^{[47, 6]} ; Ozawa, K. ^[9] ; Pak, R. ^[13] ; Pantuev, V. ^{[11, 63]} ; Papavassiliou, V. ^[7] ; Park, I. H. ^[43] ; Park, J. ^[54] ; Park, S. K. ^[48] ; Park, W. J. ^[48] ; Pate, S. F. ^[7] ; Pei, H. ^[46] ; Peng, J. -C. ^[42] ; Pereira, H. ^[64] ; Peresedov, V. ^[2] ; Peressounko, D. Yu. ^[38] ; Pinkenburg, C. ^[13] ; Pisani, R. P. ^[13] ; Proissl, M. ^[11] ; Purschke, M. L. ^[13] ; Purwar, A. K. ^[25] ; Qu, H. ^[45] ; Rak, J. ^{[52, 53]} ; Rakotozafindrabe, A. ^[10] ; Ravinovich, I. ^[39] ; Read, K. F. ^{[12, 41]} ; Reygers, K. ^[21] ; Riabov, V. ^[20] ; Riabov, Y. ^[20] ; Richardson, E. ^[58] ; Roach, D. ^[22] ; Roche, G. ^[65] ; Rolnick, S. D. ^[17] ; Rosati, M. ^[46] ; Rosen, C. A. ^[1] ; Rosendahl, S. S. E. ^[29] ; Rosnet, P. ^[65] ; Rukoyatkin, P. ^[2] ; Ruzicka, P. ^[59] ; Sahlmueller, B. ^[21] ; Saito, N. ^[61] ; Sakaguchi, T. ^[13] ; Sakashita, K. ^{[62, 6]} ; Samsonov, V. ^[20] ; Sano, S. ^{[66, 9]} ; Sato, T. ^[30] ; Sawada, S. ^[61] ; Sedgwick, K. ^[17] ; Seele, J. ^[1] ; Seidl, R. ^[42] ; Semenov, A. Yu. ^[46] ; Seto, R. ^[17] ; Sharma, D. ^[39] ; Shein, I. ^[14] ; Shibata, T. -A. ^{[62, 6]} ; Shigaki, K. ^[47] ; Shimomura, M. ^[30] ; Shoji, K. ^{[8, 6]} ; Shukla, P. ^[28] ; Sickles, A. ^[13] ; Silva, C. L. ^[34] ; Silvermyr, D. ^[12] ; Silvestre, C. ^[64] ; Sim, K. S. ^[48] ; Singh, B. K. ^[60] ; Singh, C. P. ^[60] ; Singh, V. ^[60] ; Slunecka, M. ^[37] ; Soltz, R. A. ^[35] ; Sondheim, W. E. ^[25] ; Sorensen, S. P. ^[41] ; Sourikova, I. V. ^[13] ; Sparks, N. A. ^[19] ; Stankus, P. W. ^[12] ; Stenlund, E. ^[29] ; Stoll, S. P. ^[13] ; Sugitate, T. ^[47] ; Sukhanov, A. ^[13] ; Sziklai, J. ^[32] ; Takagui, E. M. ^[34] ; Taketani, A. ^{[5, 6]} ; Tanabe, R. ^[30] ; Tanaka, Y. ^[40] ; Tanida, K. ^{[8, 5, 6]} ; Tannenbaum, M. J. ^[13] ; Tarafdar, S. ^[60] ; Taranenko, A. ^[4] ; Tarjan, P. ^[67] ; Themann, H. ^[11] ; Thomas, T. L. ^[18] ; Togawa, M. ^{[8, 6]} ; Toia, A. ^[11] ; Tomasek, L. ^[59] ; Torii, H. ^[47] ; Towell, R. S. ^[19] ; Tserruya, I. ^[39] ; Tsuchimoto, Y. ^[47] ; Vale, C. ^{[13, 46]} ; Valle, H. ^[22] ; Van Hecke, H. W. ^[25] ; Vazquez-Zambrano, E. ^{[26, 27]} ; Veicht, A. ^[42] ; Velkovska, J. ^[22] ; Vertesi, R. ^{[67, 32]} ; Vinogradov, A. A. ^[38] ; Virius, M. ^[56] ; Vrba, V. ^[59] ; Vznuzdaev, E. ^[20] ; Wang, X. R. ^[7] ; Watanabe, D. ^[47] ; Watanabe, K. ^[30] ; Watanabe, Y. ^{[5, 6]} ; Wei, F. ^[46] ; Wei, R. ^[4] ; Wessels, J. ^[21] ; White, S. N. ^[13] ; Winter, D. ^{[26, 27]} ; Wood, J. P. ^[19] ; Woody, C. L. ^[13] ; Wright, R. M. ^[19] ; Wysocki, M. ^[1] ; Xie, W. ^[5] ; Yamaguchi, Y. L. ^[9] ; Yamaura, K. ^[47] ; Yang, R. ^[42] ; Yanovich, A. ^[14] ; Ying, J. ^[45] ; Yokkaichi, S. ^{[5, 6]} ; You, Z. ^[44] ; Young, G. R. ^[12] ; Younus, I. ^[18] ; Yushmanov, I. E. ^[38] ; Zajc, W. A. ^{[26, 27]} ; Zhang, C. ^[12] ; Zhou, S. ^[57] ; Zolin, L. ^[2] ; Collaboration, PHENIX

Affiliation:Show less -

^[1] Univ Colorado, Boulder, CO 80309 - USA

^[2] Joint Inst Nucl Res, Dubna 141980 - Russia

^[3] Univ Massachusetts, Dept Phys, Amherst, MA 01003 - USA

^[4] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 - USA

^[5] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 - USA

^[6] RIKEN Nishina Ctr Accelerator Based Sci, Wako, Saitama 3510198 - Japan

^[7] New Mexico State Univ, Las Cruces, NM 88003 - USA

^[8] Kyoto Univ, Kyoto 6068502 - Japan

^[9] Univ Tokyo, Grad Sch Sci, Ctr Nucl Study, Bunkyo Ku, Tokyo 1130033 - Japan

^[10] Ecole Polytech, CNRS IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau - France

^[11] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 - USA

^[12] Oak Ridge Natl Lab, Oak Ridge, TN 37831 - USA

^[13] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 - USA

^[14] State Res Ctr Russian Federat, IHEP Protvino, Inst High Energy Phys, Protvino 142281 - Russia

^[15] Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 - USA

^[16] Florida Inst Technol, Melbourne, FL 32901 - USA

^[17] Univ Calif Riverside, Riverside, CA 92521 - USA

^[18] Univ New Mexico, Albuquerque, NM 87131 - USA

^[19] Abilene Christian Univ, Abilene, TX 79699 - USA

^[20] Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Regio - Russia

^[21] Univ Munster, Inst Kernphys, D-48149 Munster - Germany

^[22] Vanderbilt Univ, Nashville, TN 37235 - USA

^[23] St Petersburg State Polytech Univ, St Petersburg 195251 - Russia

^[24] Yonsei Univ, IPAP, Seoul 120749 - South Korea

^[25] Los Alamos Natl Lab, Los Alamos, NM 87545 - USA

^[26] Columbia Univ, New York, NY 10027 - USA

^[27] Nevis Labs, Irvington, NY 10533 - USA

^[28] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra - India

^[29] Lund Univ, Dept Phys, SE-22100 Lund - Sweden

^[30] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 305 - Japan

^[31] Eotvos Lorand Univ, ELTE, H-1117 Budapest - Hungary

^[32] Hungarian Acad Sci, Wigner Res Ctr Phys, Inst Particle & Nucl Phys, RMKI, H-1525 Budapest 114 - Hungary

^[33] Florida State Univ, Tallahassee, FL 32306 - USA

^[34] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

^[35] Lawrence Livermore Natl Lab, Livermore, CA 94550 - USA

^[36] Muhlenberg Coll, Allentown, PA 18104 - USA

^[37] Charles Univ Prague, CR-11636 Prague 1 - Czech Republic

^[38] Russian Res Ctr, Kurchatov Inst, Moscow 123098 - Russia

^[39] Weizmann Inst Sci, IL-76100 Rehovot - Israel

^[40] Nagasaki Inst Appl Sci, Nagasaki 8510193 - Japan

^[41] Univ Tennessee, Knoxville, TN 37996 - USA

^[42] Univ Illinois, Urbana, IL 61801 - USA

^[43] Ewha Womans Univ, Seoul 120750 - South Korea

^[44] Peking Univ, Beijing 100871 - Peoples R China

^[45] Georgia State Univ, Atlanta, GA 30303 - USA

^[46] Iowa State Univ, Ames, IA 50011 - USA

^[47] Hiroshima Univ, Higashihiroshima 7398526 - Japan

^[48] Korea Univ, Seoul 136701 - South Korea

^[49] Myongji Univ, Yongin 449728, Kyonggido - South Korea

^[50] Univ Paris 11, CNRS IN2P3, IPN Orsay, F-91406 Orsay - France

^[51] Rikkyo Univ, Dept Phys, Toshima Ku, Tokyo 1718501 - Japan

^[52] Helsinki Inst Phys, FI-40014 Jyvaskyla - Finland

^[53] Univ Jyvaskyla, FI-40014 Jyvaskyla - Finland

^[54] Seoul Natl Univ, Seoul - South Korea

^[55] Chonbuk Natl Univ, Jeonju 561756 - South Korea

^[56] Czech Tech Univ, Prague 16636 6 - Czech Republic

^[57] China Inst Atom Energy, Sci & Technol Nucl Data Lab, Beijing 102413 - Peoples R China

^[58] Univ Maryland, College Pk, MD 20742 - USA

^[59] Acad Sci Czech Republic, Inst Phys, Prague 18221 8 - Czech Republic

^[60] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh - India

^[61] High Energy Accelerator Org, KEK, Tsukuba, Ibaraki 3050801 - Japan

^[62] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551 - Japan

^[63] Russian Acad Sci, Inst Nucl Res, Moscow 117312 - Russia

^[64] CEA Saclay, Dapnia, F-91191 Gif Sur Yvette - France

^[65] Univ Clermont Ferrand, CNRS IN2P3, LPC, F-63177 Aubiere - France

^[66] Waseda Univ, Adv Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1620044 - Japan

^[67] Univ Debrecen, H-4010 Debrecen - Hungary

• Document type: Journal article
• Source: Physical Review Letters; v. 109, n. 12 SEP 19 2012.
• Web of Science Citations: 142

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). (AU)