Phys. Rev. Lett.
101,
232301
(2008)
[7 pages]
Suppression Pattern of Neutral Pions at High Transverse Momentum in Au+Au Collisions at √sNN=200 GeV and Constraints on Medium Transport Coefficients
A. Adare et al. PHENIX Collaboration
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A. Adare8, S. Afanasiev22, C. Aidala9, N. N. Ajitanand49, Y. Akiba43,44, H. Al-Bataineh38, J. Alexander49, A. Al-Jamel38, K. Aoki28,43, L. Aphecetche51, R. Armendariz38, S. H. Aronson3, J. Asai44, E. T. Atomssa29, R. Averbeck50, T. C. Awes39, B. Azmoun3, V. Babintsev18, G. Baksay14, L. Baksay14, A. Baldisseri11, K. N. Barish4, P. D. Barnes31, B. Bassalleck37, S. Bathe4, S. Batsouli9,39, V. Baublis42, F. Bauer4, A. Bazilevsky3, S. Belikov3,21,*, R. Bennett50, Y. Berdnikov46, A. A. Bickley8, M. T. Bjorndal9, J. G. Boissevain31, H. Borel11, K. Boyle50, M. L. Brooks31, D. S. Brown38, D. Bucher34, H. Buesching3, V. Bumazhnov18, G. Bunce3,44, J. M. Burward-Hoy31, S. Butsyk31,50, S. Campbell50, J.-S. Chai23, B. S. Chang58, J.-L. Charvet11, S. Chernichenko18, J. Chiba24, C. Y. Chi9, M. Chiu9,19, I. J. Choi58, T. Chujo55, P. Chung49, A. Churyn18, V. Cianciolo39, C. R. Cleven16, Y. Cobigo11, B. A. Cole9, M. P. Comets40, P. Constantin21,31, M. Csanád13, T. Csörgő25, T. Dahms50, K. Das15, G. David3, M. B. Deaton1, K. Dehmelt14, H. Delagrange51, A. Denisov18, D. d’Enterria9, A. Deshpande44,50, E. J. Desmond3, O. Dietzsch47, A. Dion50, M. Donadelli47, J. L. Drachenberg1, O. Drapier29, A. Drees50, A. K. Dubey57, A. Durum18, V. Dzhordzhadze4,52, Y. V. Efremenko39, J. Egdemir50, F. Ellinghaus8, W. S. Emam4, A. Enokizono17,30, H. En’yo43,44, B. Espagnon40, S. Esumi54, K. O. Eyser4, D. E. Fields37,44, M. Finger5,22, M. Finger, Jr.5,22, F. Fleuret29, S. L. Fokin27, B. Forestier32, Z. Fraenkel57,*, J. E. Frantz9,50, A. Franz3, A. D. Frawley15, K. Fujiwara43, Y. Fukao28,43, S.-Y. Fung4, T. Fusayasu36, S. Gadrat32, I. Garishvili52, F. Gastineau51, M. Germain51, A. Glenn8,52, H. Gong50, M. Gonin29, J. Gosset11, Y. Goto43,44, R. Granier de Cassagnac29, N. Grau21, S. V. Greene55, M. Grosse Perdekamp19,44, T. Gunji7, H.-Å. Gustafsson33, T. Hachiya17,43, A. Hadj Henni51, C. Haegemann37, J. S. Haggerty3, M. N. Hagiwara1, H. Hamagaki7, R. Han41, H. Harada17, E. P. Hartouni30, K. Haruna17, M. Harvey3, E. Haslum33, K. Hasuko43, R. Hayano7, M. Heffner30, T. K. Hemmick50, T. Hester4, J. M. Heuser43, X. He16, H. Hiejima19, J. C. Hill21, R. Hobbs37, M. Hohlmann14, M. Holmes55, W. Holzmann49, K. Homma17, B. Hong26, T. Horaguchi43,53, D. Hornback52, M. G. Hur23, T. Ichihara43,44, K. Imai28,43, J. Imrek12, M. Inaba54, Y. Inoue45,43, D. Isenhower1, L. Isenhower1, M. Ishihara43, T. Isobe7, M. Issah49, A. Isupov22, B. V. Jacak50,†, J. Jia9, J. Jin9, O. Jinnouchi44, B. M. Johnson3, K. S. Joo35, D. Jouan40, F. Kajihara7,43, S. Kametani7,56, N. Kamihara43,53, J. Kamin50, M. Kaneta44, J. H. Kang58, H. Kanou43,53, T. Kawagishi54, D. Kawall44, A. V. Kazantsev27, S. Kelly8, A. Khanzadeev42, J. Kikuchi56, D. H. Kim35, D. J. Kim58, E. Kim48, Y.-S. Kim23, E. Kinney8, A. Kiss13, E. Kistenev3, A. Kiyomichi43, J. Klay30, C. Klein-Boesing34, L. Kochenda42, V. Kochetkov18, B. Komkov42, M. Konno54, D. Kotchetkov4, A. Kozlov57, A. Král10, A. Kravitz9, P. J. Kroon3, J. Kubart5,20, G. J. Kunde31, N. Kurihara7, K. Kurita45,43, M. J. Kweon26, Y. Kwon52,58, G. S. Kyle38, R. Lacey49, Y.-S. Lai9, J. G. Lajoie21, A. Lebedev21, Y. Le Bornec40, S. Leckey50, D. M. Lee31, M. K. Lee58, T. Lee48, M. J. Leitch31, M. A. L. Leite47, B. Lenzi47, H. Lim48, T. Liška10, A. Litvinenko22, M. X. Liu31, X. Li6, X. H. Li4, B. Love55, D. Lynch3, C. F. Maguire55, Y. I. Makdisi3, A. Malakhov22, M. D. Malik37, V. I. Manko27, Y. Mao41,43, L. Mašek5,20, H. Masui54, F. Matathias9,50, M. C. McCain19, M. McCumber50, P. L. McGaughey31, Y. Miake54, P. Mikeš5,20, K. Miki54, T. E. Miller55, A. Milov50, S. Mioduszewski3, G. C. Mishra16, M. Mishra2, J. T. Mitchell3, M. Mitrovski49, A. Morreale4, D. P. Morrison3, J. M. Moss31, T. V. Moukhanova27, D. Mukhopadhyay55, J. Murata45,43, S. Nagamiya24, Y. Nagata54, J. L. Nagle8, M. Naglis57, I. Nakagawa43,44, Y. Nakamiya17, T. Nakamura17, K. Nakano43,53, J. Newby30, M. Nguyen50, B. E. Norman31, A. S. Nyanin27, J. Nystrand33, E. O’Brien3, S. X. Oda7, C. A. Ogilvie21, H. Ohnishi43, I. D. Ojha55, H. Okada28,43, K. Okada44, M. Oka54, O. O. Omiwade1, A. Oskarsson33, I. Otterlund33, M. Ouchida17, K. Ozawa7, R. Pak3, D. Pal55, A. P. T. Palounek31, V. Pantuev50, V. Papavassiliou38, J. Park48, W. J. Park26, S. F. Pate38, H. Pei21, J.-C. Peng19, H. Pereira11, V. Peresedov22, D. Yu. Peressounko27, C. Pinkenburg3, R. P. Pisani3, M. L. Purschke3, A. K. Purwar31,50, H. Qu16, J. Rak21,37, A. Rakotozafindrabe29, I. Ravinovich57, K. F. Read39,52, S. Rembeczki14, M. Reuter50, K. Reygers34, V. Riabov42, Y. Riabov42, G. Roche32, A. Romana29,*, M. Rosati21, S. S. E. Rosendahl33, P. Rosnet32, P. Rukoyatkin22, V. L. Rykov43, S. S. Ryu58, B. Sahlmueller34, N. Saito28,43,44, T. Sakaguchi3,7,56, S. Sakai54, H. Sakata17, V. Samsonov42, H. D. Sato28,43, S. Sato3,24,54, S. Sawada24, J. Seele8, R. Seidl19, V. Semenov18, R. Seto4, D. Sharma57, T. K. Shea3, I. Shein18, A. Shevel42,49, T.-A. Shibata43,53, K. Shigaki17, M. Shimomura54, T. Shohjoh54, K. Shoji28,43, A. Sickles50, C. L. Silva47, D. Silvermyr39, C. Silvestre11, K. S. Sim26, C. P. Singh2, V. Singh2, S. Skutnik21, M. Slunečka5,22, W. C. Smith1, A. Soldatov18, R. A. Soltz30, W. E. Sondheim31, S. P. Sorensen52, I. V. Sourikova3, F. Staley11, P. W. Stankus39, E. Stenlund33, M. Stepanov38, A. Ster25, S. P. Stoll3, T. Sugitate17, C. Suire40, J. P. Sullivan31, J. Sziklai25, T. Tabaru44, S. Takagi54, E. M. Takagui47, A. Taketani43,44, K. H. Tanaka24, Y. Tanaka36, K. Tanida43,44, M. J. Tannenbaum3, A. Taranenko49, P. Tarján12, T. L. Thomas37, M. Togawa28,43, A. Toia50, J. Tojo43, L. Tomášek20, H. Torii43, R. S. Towell1, V-N. Tram29, I. Tserruya57, Y. Tsuchimoto17,43, S. K. Tuli2, H. Tydesjö33, N. Tyurin18, C. Vale21, H. Valle55, H. W. van Hecke31, J. Velkovska55, R. Vertesi12, A. A. Vinogradov27, M. Virius10, V. Vrba20, E. Vznuzdaev42, M. Wagner28,43, D. Walker50, X. R. Wang38, Y. Watanabe43,44, J. Wessels34, S. N. White3, N. Willis40, D. Winter9, C. L. Woody3, M. Wysocki8, W. Xie4,44, Y. L. Yamaguchi56, A. Yanovich18, Z. Yasin4, J. Ying16, S. Yokkaichi43,44, G. R. Young39, I. Younus37, I. E. Yushmanov27, W. A. Zajc9, O. Zaudtke34, C. Zhang9,39, S. Zhou6, J. Zimányi25,*, and L. Zolin22 (PHENIX Collaboration)
1Abilene Christian University, Abilene, Texas 79699, USA
2Department of Physics, Banaras Hindu University, Varanasi 221005, India
3Brookhaven National Laboratory, Upton, New York 11973-5000, USA
4University of California-Riverside, Riverside, California 92521, USA
5Charles University, Ovocný trh 5, Praha 1, 116 36, Prague, Czech Republic
6China Institute of Atomic Energy (CIAE), Beijing, People’s Republic of China
7Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
8University of Colorado, Boulder, Colorado 80309, USA
9Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA
10Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic
11Dapnia, CEA Saclay, F-91191, Gif-sur-Yvette, France
12Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary
13ELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, Hungary
14Florida Institute of Technology, Melbourne, Florida 32901, USA
15Florida State University, Tallahassee, Florida 32306, USA
16Georgia State University, Atlanta, Georgia 30303, USA
17Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
18IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, Russia
19University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
20Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
21Iowa State University, Ames, Iowa 50011, USA
22Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
23KAERI, Cyclotron Application Laboratory, Seoul, Korea
24KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
25KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), H-1525 Budapest 114, POBox 49, Budapest, Hungary
26Korea University, Seoul, 136-701, Korea
27Russian Research Center “Kurchatov Institute”, Moscow, Russia
28Kyoto University, Kyoto 606-8502, Japan
29Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, France
30Lawrence Livermore National Laboratory, Livermore, California 94550, USA
31Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
32LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France
33Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
34Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
35Myongji University, Yongin, Kyonggido 449-728, Korea
36Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
37University of New Mexico, Albuquerque, New Mexico 87131, USA
38New Mexico State University, Las Cruces, New Mexico 88003, USA
39Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
40IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, France
41Peking University, Beijing, People’s Republic of China
42PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, 188300, Russia
43RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
44RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
45Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
46Saint Petersburg State Polytechnic University, St. Petersburg, Russia
47Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
48System Electronics Laboratory, Seoul National University, Seoul, Korea
49Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA
50Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA
51SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722-44307, Nantes, France
52University of Tennessee, Knoxville, Tennessee 37996, USA
53Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
54Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
55Vanderbilt University, Nashville, Tennessee 37235, USA
56Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
57Weizmann Institute, Rehovot 76100, Israel
58Yonsei University, IPAP, Seoul 120-749, Korea
Received 25 January 2008; published 3 December 2008
For Au+Au collisions at 200 GeV, we measure neutral pion production with good statistics for transverse momentum, pT, up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5<pT<20 GeV/c. Experimental uncertainties are small enough to constrain any model-dependent parametrization for the transport coefficient of the medium, e.g., ⟨q̂⟩ in the parton quenching model. The spectral shape is similar for all collision classes, and the suppression does not saturate in Au+Au collisions.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.232301
DOI:
10.1103/PhysRevLett.101.232301
*Deceased †PHENIX Spokesperson: jacak@skipper.physics.sunysb.edu
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