| Thème(s) : |
 |
Physique/Physique Nucléaire Expérimentale
|
|
| Titre : |
|
Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature |
|
| Auteur : |
|
A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, A. Al-Jamel, K. Aoki, L. Aphecetche1, R. Armendariz, S.H. Aronson, J. Asai, E.T. Atomssa2, R. Averbeck, T.C. Awes, B. Azmoun, V. Babintsev, G. Baksay, L. Baksay, A. Baldisseri3, K.N. Barish, P.D. Barnes, B. Bassalleck, S. Bathe, S. Batsouli, V. Baublis, F. Bauer, A. Bazilevsky, S. Belikov, R. Bennett, Y. Berdnikov, A.A. Bickley, M.T. Bjorndal, J.G. Boissevain, H. Borel3, K. Boyle, M.L. Brooks, D.S. Brown, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, J.M. Burward-Hoy, S. Butsyk, S. Campbell, J.-S. Chai, B.S. Chang, J.-L. Charvet3, S. Chernichenko, J. Chiba, C.Y. Chi, M. Chiu, I.J. Choi, T. Chujo, P. Chung, A. Churyn, V. Cianciolo, C.R. Cleven, Y. Cobigo3, B.A. Cole, M.P. Comets4, P. Constantin, M. Csan'ad, T. Cs¨org˝o, T. Dahms, K. Das, G. David, M.B. Deaton, K. Dehmelt, H. Delagrange1, A. Denisov, D. d'Enterria, A. Deshpande, E.J. Desmond, O. Dietzsch, A. Dion, M. Donadelli, J.L. Drachenberg, O. Drapier2, A. Drees, A.K. Dubey, A. Durum, V. Dzhordzhadze, Y.V. Efremenko, J. Egdemir, F. Ellinghaus, W.S. Emam, A. Enokizono, H. En'yo, B. Espagnon4, S. Esumi, K.O. Eyser, D.E. Fields, M. Finger, M. Finger Jr., F. Fleuret2, S.L. Fokin, B. Forestier5, Z. Fraenkel, J.E. Frantz, A. Franz, A.D. Frawley, K. Fujiwara, Y. Fukao, S.-Y. Fung, T. Fusayasu, S. Gadrat5, I. Garishvili, F. Gastineau1, M. Germain1, A. Glenn, H. Gong, M. Gonin2, J. Gosset3, Y. Goto, R. Granier de Cassagnac2, N. Grau, S.V. Greene, M. Grosse Perdekamp, T. Gunji, H.-°a. Gustafsson, T. Hachiya, A. Hadj Henni1, C. Haegemann, J.S. Haggerty, M.N. Hagiwara, H. Hamagaki, R. Han, H. Harada, E.P. Hartouni, K. Haruna, M. Harvey, E. Haslum, K. Hasuko, R. Hayano, M. Heffner, T.K. Hemmick, T. Hester, J.M. Heuser, X. He, H. Hiejima, J.C. Hill, R. Hobbs, M. Hohlmann, M. Holmes, W. Holzmann, K. Homma, B. Hong, T. Horaguchi, D. Hornback, M.G. Hur, T. Ichihara, K. Imai, M. Inaba, Y. Inoue, D. Isenhower, L. Isenhower, M. Ishihara, T. Isobe, M. Issah, A. Isupov, B.V. Jacak, J. Jia, J. Jin, O. Jinnouchi, B.M. Johnson, K.S. Joo, D. Jouan4, F. Kajihara, S. Kametani, N. Kamihara, J. Kamin, M. Kaneta, J.H. Kang, H. Kanou, T. Kawagishi, D. Kawall, A.V. Kazantsev, S. Kelly, A. Khanzadeev, J. Kikuchi, D.H. Kim, D.J. Kim, E. Kim, Y.-S. Kim, E. Kinney, A. Kiss, E. Kistenev, A. Kiyomichi, J. Klay, C. Klein-Boesing, L. Kochenda, V. Kochetkov, B. Komkov, M. Konno, D. Kotchetkov, A. Kozlov, A. Kr'al, A. Kravitz, P.J. Kroon, J. Kubart, G.J. Kunde, N. Kurihara, K. Kurita, M.J. Kweon, Y. Kwon, G.S. Kyle, R. Lacey, Y.-S. Lai, J.G. Lajoie, A. A. Lebedev, Y. Le Bornec4, S. Leckey, D.M. Lee, M.K. Lee, T. Lee, M.J. Leitch, M.A.L. Leite, B. Lenzi, H. Lim, T. Liˇska, A. Litvinenko, M.X. Liu, X. Li, X.H. Li, B. Love, D. Lynch, C.F. Maguire, Y.I. Makdisi, A. Malakhov, M.D. Malik, V.I. Manko, Y. Mao, L. Maˇsek, H. Masui, F. Matathias, M.C. McCain, M. Mccumber, P.L. McGaughey, Y. Miake, P. Mikeˇs, K. Miki, T.E. Miller, A. Milov, S. Mioduszewski, G.C. Mishra, M. Mishra, J.T. Mitchell, M. Mitrovski, A. Morreale, D.P. Morrison, J.M. Moss, T.V. Moukhanova, D. Mukhopadhyay, J. Murata, S. Nagamiya, Y. Nagata, J.L. Nagle, M. Naglis, I. Nakagawa, Y. Nakamiya, T. Nakamura, K. Nakano, J. Newby, M. Nguyen, B.E. Norman, A.S. Nyanin, J. Nystrand, E. O'Brien, S.X. Oda, C.A. Ogilvie, H. Ohnishi, I.D. Ojha, H. Okada, K. Okada, M. Oka, O.O. Omiwade, A. Oskarsson, I. Otterlund, M. Ouchida, K. Ozawa, R. Pak, D. Pal, A.P.T. Palounek, V. Pantuev, V. Papavassiliou, J. Park, W.J. Park, S.F. Pate, H. Pei, J.-C. Peng, H. Pereira3, V. Peresedov, D.Yu. Peressounko, C. Pinkenburg, R.P. Pisani, M.L. Purschke, A.K. Purwar, H. Qu, J. Rak, A. Rakotozafindrabe2, I. Ravinovich, K.F. Read, S. Rembeczki, M. Reuter, K. Reygers, V. Riabov, Y. Riabov, G. Roche5, A. Romana2, M. Rosati, S.S.E. Rosendahl, P. Rosnet5, P. Rukoyatkin, V.L. Rykov, S.S. Ryu, B. Sahlmueller, N. Saito, T. Sakaguchi, S. Sakai, H. Sakata, V. Samsonov, H.D. Sato, S. Sato, S. Sawada, J. Seele, R. Seidl, V. Semenov, R. Seto, D. Sharma, T.K. Shea, I. Shein, A. Shevel, T.-A. Shibata, K. Shigaki, M. Shimomura, T. Shohjoh, K. Shoji, A. Sickles, C.L. Silva, D. Silvermyr, C. Silvestre3, K.S. Sim, C.P. Singh, V. Singh, S. Skutnik, M. Slunecka, W.C. Smith, A. Soldatov, R.A. Soltz, W.E. Sondheim, S.P. Sorensen, I.V. Sourikova, F. Staley3, P.W. Stankus, E. Stenlund, M. Stepanov, A. Ster, S.P. Stoll, T. Sugitate, C. Suire4, J.P. Sullivan, J. Sziklai, T. Tabaru, S. Takagi, E.M. Takagui, A. Taketani, K.H. Tanaka, Y. Tanaka, K. Tanida, M.J. Tannenbaum, A. Taranenko, P. Tarj'an, T.L. Thomas, M. Togawa, A. Toia, J. Tojo, L. Tom'aˇsek, H. Torii, R.S. Towell, V.-N. Tram2, I. Tserruya, Y. Tsuchimoto, S.K. Tuli, H. Tydesj¨o, N. Tyurin, C. Vale, H. Valle, H.W. Van Hecke, J. Velkovska, R. Vertesi, A.A. Vinogradov, M. Virius, V. Vrba, E. Vznuzdaev, M. Wagner, D. Walker, X.R. Wang, Y. Watanabe, J. Wessels, S.N. White, N. Willis4, D. Winter, C.L. Woody, M. Wysocki, W. Xie, Y.L. Yamaguchi, A. Yanovich, Z. Yasin, J. Ying, S. Yokkaichi, G.R. Young, I. Younus, I.E. Yushmanov, W.A. Zajc, O. Zaudtke, C. Zhang, S. Zhou, J. Zim'anyi, L. Zolin |
|
| Laboratoire : |
|
|
|
| Résumé : |
|
The production of low mass e+e- pairs for m_{e+e-} < 300 MeV/c^2 and 1 < p_T <5 GeV/c is measured in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV. Enhanced e+e- pair yield above hadronic sources is observed in Au+Au collisions. Treating the excess as internal conversion of direct photons, the invariant yield of direct photons is deduced. In central Au+Au collisions, the excess over p+p is exponential in p_T}, with inverse slope T = 221 +/- 23 (stat) +/- 18 (syst) MeV. Hydrodynamical models with initial temperatures T_init ~ 300-600 MeV at times of 0.6 - 0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition at ~ 170 MeV. |
|
| Collaboration/Projet : |
|
PHENIX |
|
|
| Type de publication : |
|
Articles dans des revues avec comité de lecture |
|
Date de publication
ou d'écriture : |
|
2010 |
|
| Nom du périodique : |
|
| Physical Review Letters (Phys. Rev. Lett.) |
| Publisher |
American Physical Society |
| ISSN |
0031-9007 (eISSN : 1079-7114) |
|
|
| Volume : |
|
104 |
|
| Page/Article : |
|
132301 |
|
|
| Identifiant local : |
|
SUBATECH-Plasma |
|
| Classification PACS : |
|
13.85.Qk, 13.20.Fc, 13.20.He, 25.75.Dw |
|
| Commentaire : |
|
421 authors from 58 institutions, 6 pages, 4 figures. Submitted to Physical Review Letters. 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 |
|
Récupérer au format
