/ Experiment-Nucl arXiv:1204.1526


Evolution of $\pi^0$ suppression in Au+Au collisions from $\sqrt{s_{NN}} = 39$ to 200 GeV


Adare, A. (Colorado U.) ; Afanasiev, S. (Dubna, JINR) ; Aidala, C. (Los Alamos) ; Ajitanand, N.N. (SUNY, Stony Brook) ; Akiba, Y. (Brookhaven) ; Akimoto, R. (Tokyo U.) ; Al-Ta'ani, H. (New Mexico State U.) ; Alexander, J. (SUNY, Stony Brook) ; Angerami, A. (Nevis Labs, Columbia U.) ; Aoki, K. (Nishina Ctr., RIKEN) ; Apadula, N. (SUNY, Stony Brook) ; Aramaki, Y. (Nishina Ctr., RIKEN) ; Asano, H. (Nishina Ctr., RIKEN) ; Aschenauer, E.C. (Brookhaven) ; Atomssa, E.T. (SUNY, Stony Brook) ; Awes, T.C. (Oak Ridge) ; Azmoun, B. (Brookhaven) ; Babintsev, V. (Serpukhov, IHEP) ; Bai, M. (Brookhaven) ; Bannier, B. (SUNY, Stony Brook) ; Barish, K.N. (UC, Riverside) ; Bassalleck, B. (New Mexico U.) ; Bathe, S. (Brookhaven) ; Baublis, V. (St. Petersburg, INP) ; Baumgart, S. (Nishina Ctr., RIKEN) ; Bazilevsky, A. (Brookhaven) ; Belmont, R. (Vanderbilt U.) ; Berdnikov, A. (St. Petersburg Polytechnic Inst.) ; Berdnikov, Y. (St. Petersburg Polytechnic Inst.) ; Bing, X. (Ohio U.) ; Blau, D.S. (Kurchatov Inst., Moscow) ; Boyle, K. (Brookhaven) ; Brooks, M.L. (Los Alamos) ; Buesching, H. (Brookhaven) ; Bumazhnov, V. (Serpukhov, IHEP) ; Butsyk, S. (New Mexico U.) ; Campbell, S. (SUNY, Stony Brook) ; Castera, P. (SUNY, Stony Brook) ; Chen, C.H. (SUNY, Stony Brook) ; Chi, C.Y. (Nevis Labs, Columbia U.) ; Chiu, M. (Brookhaven) ; Choi, I.J. (Illinois U., Urbana) ; Choi, J.B. (Chonbuk Natl. U.) ; Choi, S. (Seoul Natl. U.) ; Choudhury, R.K. (Bhabha Atomic Res. Ctr.) ; Christiansen, P. (Lund U.) ; Chujo, T. (Tsukuba U.) ; Chvala, O. (UC, Riverside) ; Cianciolo, V. (Oak Ridge) ; Citron, Z. (SUNY, Stony Brook) ; Cole, B.A. (Nevis Labs, Columbia U.) ; Connors, M. (SUNY, Stony Brook) ; Csanad, M. (Eotvos U.) ; Csorgo, T. (Budapest, RMKI) ; Dairaku, S. (Nishina Ctr., RIKEN) ; Datta, A. (Massachusetts U., Amherst) ; Daugherity, M.S. (Abilene Christian U.) ; David, G. (Brookhaven) ; Denisov, A. (Serpukhov, IHEP) ; Deshpande, A. (SUNY, Stony Brook) ; Desmond, E.J. (Brookhaven) ; Dharmawardane, K.V. (New Mexico State U.) ; Dietzsch, O. (Sao Paulo U.) ; Ding, L. (Iowa State U.) ; Dion, A. (Iowa State U.) ; Donadelli, M. (Sao Paulo U.) ; Drapier, O. (Ecole Polytechnique) ; Drees, A. (SUNY, Stony Brook) ; Drees, K.A. (Brookhaven) ; Durham, J.M. (SUNY, Stony Brook) ; Durum, A. (Serpukhov, IHEP) ; D'Orazio, L. (Maryland U.) ; Edwards, S. (Brookhaven) ; Efremenko, Y.V. (Oak Ridge) ; Engelmore, T. (Nevis Labs, Columbia U.) ; Enokizono, A. (Oak Ridge) ; Esumi, S. (Tsukuba U.) ; Eyser, K.O. (UC, Riverside) ; Fadem, B. (Muhlenberg Coll.) ; Fields, D.E. (New Mexico U.) ; Finger, M. (Charles U.) ; M.Finger, Jr. (Charles U.) ; Fleuret, F. (Ecole Polytechnique) ; Fokin, S.L. (Kurchatov Inst., Moscow) ; Frantz, J.E. (Ohio U.) ; Franz, A. (Brookhaven) ; Frawley, A.D. (Florida State U.) ; Fukao, Y. (Nishina Ctr., RIKEN) ; Fusayasu, T. (Nagasaki Inst. Appl. Sci.) ; Gainey, K. (Abilene Christian U.) ; Gal, C. (SUNY, Stony Brook) ; Garishvili, A. (Tennessee U.) ; Garishvili, I. (LLNL, Livermore) ; Glenn, A. (LLNL, Livermore) ; Gong, X. (SUNY, Stony Brook) ; Gonin, M. (Ecole Polytechnique) ; Goto, Y. (Brookhaven) ; Granier de Cassagnac, R. (Ecole Polytechnique) ; Grau, N. (Nevis Labs, Columbia U.) ; Greene, S.V. (Vanderbilt U.) ; Grosse Perdekamp, M. (Illinois U., Urbana) ; Gunji, T. (Tokyo U.) ; Guo, L. (Los Alamos) ; Gustafsson, H.A. (Lund U.) ; Hachiya, T. (Nishina Ctr., RIKEN) ; Haggerty, J.S. (Brookhaven) ; Hahn, K.I. (Ewha Women's U., Seoul) ; Hamagaki, H. (Tokyo U.) ; Hanks, J. (Nevis Labs, Columbia U.) ; Hashimoto, K. (Rikkyo U.) ; Haslum, E. (Lund U.) ; Hayano, R. (Tokyo U.) ; He, X. (Georgia State U.) ; Hemmick, T.K. (SUNY, Stony Brook) ; Hester, T. (UC, Riverside) ; Hill, J.C. (Iowa State U.) ; Hollis, R.S. (UC, Riverside) ; Homma, K. (Hiroshima U.) ; Hong, B. (Korea U.) ; Horaguchi, T. (Tsukuba U.) ; Hori, Y. (Tokyo U.) ; Huang, S. (Vanderbilt U.) ; Ichihara, T. (Brookhaven) ; Iinuma, H. (KEK, Tsukuba) ; Ikeda, Y. (Tsukuba U.) ; Imrek, J. (Debrecen U.) ; Inaba, M. (Tsukuba U.) ; Iordanova, A. (UC, Riverside) ; Isenhower, D. (Abilene Christian U.) ; Issah, M. (Vanderbilt U.) ; Isupov, A. (Dubna, JINR) ; Ivanischev, D. (St. Petersburg, INP) ; Jacak, B.V. (SUNY, Stony Brook) ; Javani, M. (Georgia State U.) ; Jia, J. (SUNY, Stony Brook) ; Jiang, X. (Los Alamos) ; Johnson, B.M. (Brookhaven) ; Joo, K.S. (Myong Ji U.) ; Jouan, D. (Orsay, IPN) ; Kamin, J. (SUNY, Stony Brook) ; Kaneti, S. (SUNY, Stony Brook) ; Kang, B.H. (Hanyang U.) ; Kang, J.H. (Yonsei U.) ; Kang, J.S. (Hanyang U.) ; Kapustinsky, J. (Los Alamos) ; Karatsu, K. (Nishina Ctr., RIKEN) ; Kasai, M. (Rikkyo U.) ; Kawall, D. (Brookhaven) ; Kazantsev, A.V. (Kurchatov Inst., Moscow) ; Kempel, T. (Iowa State U.) ; Khanzadeev, A. (St. Petersburg, INP) ; Kijima, K.M. (Hiroshima U.) ; Kim, B.I. (Korea U.) ; Kim, C. (Korea U.) ; Kim, D.J. (Helsinki Inst. of Phys.) ; Kim, E.J. (Chonbuk Natl. U.) ; Kim, H.J. (Yonsei U.) ; Kim, K.B. (Chonbuk Natl. U.) ; Kim, Y.J. (Illinois U., Urbana) ; Kim, Y.K. (Hanyang U.) ; Kinney, E. (Colorado U.) ; Kiss, A. (Eotvos U.) ; Kistenev, E. (Brookhaven) ; Klatsky, J. (Florida State U.) ; Kleinjan, D. (UC, Riverside) ; Kline, P. (SUNY, Stony Brook) ; Komatsu, Y. (Tokyo U.) ; Komkov, B. (St. Petersburg, INP) ; Koster, J. (Illinois U., Urbana) ; Kotchetkov, D. (Ohio U.) ; Kotov, D. (St. Petersburg Polytechnic Inst.) ; Kral, A. (Prague, Tech. U.) ; Krizek, F. (Helsinki Inst. of Phys.) ; Kunde, G.J. (Los Alamos) ; Kurita, K. (Rikkyo U.) ; Kurosawa, M. (Nishina Ctr., RIKEN) ; Kwon, Y. (Yonsei U.) ; Kyle, G.S. (New Mexico State U.) ; Lacey, R. (SUNY, Stony Brook) ; Lai, Y.S. (Nevis Labs, Columbia U.) ; Lajoie, J.G. (Iowa State U.) ; Lebedev, A. (Iowa State U.) ; Lee, B. (Hanyang U.) ; Lee, D.M. (Los Alamos) ; Lee, J. (Ewha Women's U., Seoul) ; Lee, K.B. (Korea U.) ; Lee, K.S. (Korea U.) ; Lee, S.H. (SUNY, Stony Brook) ; Lee, S.R. (Chonbuk Natl. U.) ; Leitch, M.J. (Los Alamos) ; Leite, M.A.L. (Sao Paulo U.) ; Leitgab, M. (Illinois U., Urbana) ; Lewis, B. (SUNY, Stony Brook) ; Lim, S.H. (Yonsei U.) ; Linden Levy, L.A. (Colorado U.) ; Litvinenko, A. (Dubna, JINR) ; Liu, M.X. (Los Alamos) ; Love, B. (Vanderbilt U.) ; Maguire, C.F. (Vanderbilt U.) ; Makdisi, Y.I. (Brookhaven) ; Makek, M. (Weizmann Inst.) ; Malakhov, A. (Dubna, JINR) ; Manion, A. (SUNY, Stony Brook) ; Manko, V.I. (Kurchatov Inst., Moscow) ; Mannel, E. (Nevis Labs, Columbia U.) ; Masumoto, S. (Tokyo U.) ; McCumber, M. (Colorado U.) ; McGaughey, P.L. (Los Alamos) ; McGlinchey, D. (Florida State U.) ; McKinney, C. (Illinois U., Urbana) ; Mendoza, M. (UC, Riverside) ; Meredith, B. (Illinois U., Urbana) ; Miake, Y. (Tsukuba U.) ; Mibe, T. (KEK, Tsukuba) ; Mignerey, A.C. (Maryland U.) ; Milov, A. (Weizmann Inst.) ; Mishra, D.K. (Bhabha Atomic Res. Ctr.) ; Mitchell, J.T. (Brookhaven) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Miyasaka, S. (Tokyo Inst. Tech.) ; Mohanty, A.K. (Bhabha Atomic Res. Ctr.) ; Moon, H.J. (Myong Ji U.) ; Morrison, D.P. (Brookhaven) ; Motschwiller, S. (Muhlenberg Coll.) ; Moukhanova, T.V. (Kurchatov Inst., Moscow) ; Murakami, T. (Nishina Ctr., RIKEN) ; Murata, J. (Rikkyo U.) ; Nagae, T. (Kyoto U.) ; Nagamiya, S. (KEK, Tsukuba) ; Nagle, J.L. (Colorado U.) ; Nagy, M.I. (Budapest, RMKI) ; Nakagawa, I. (Brookhaven) ; Nakamiya, Y. (Hiroshima U.) ; Nakamura, K.R. (Nishina Ctr., RIKEN) ; Nakamura, T. (Nishina Ctr., RIKEN) ; Nakano, K. (Tokyo Inst. Tech.) ; Nattrass, C. (Tennessee U.) ; Nederlof, A. (Muhlenberg Coll.) ; Nihashi, M. (Nishina Ctr., RIKEN) ; Nouicer, R. (Brookhaven) ; Novitzky, N. (Helsinki Inst. of Phys.) ; Nyanin, A.S. (Kurchatov Inst., Moscow) ; O'Brien, E. (Brookhaven) ; Ogilvie, C.A. (Iowa State U.) ; Okada, K. (Brookhaven) ; Oskarsson, A. (Lund U.) ; Ouchida, M. (Nishina Ctr., RIKEN) ; Ozawa, K. (Tokyo U.) ; Pak, R. (Brookhaven) ; Papavassiliou, V. (New Mexico State U.) ; Park, B.H. (Hanyang U.) ; Park, I.H. (Ewha Women's U., Seoul) ; Park, S.K. (Korea U.) ; Pate, S.F. (New Mexico State U.) ; Patel, L. (Georgia State U.) ; Pei, H. (Iowa State U.) ; Peng, J.C. (Illinois U., Urbana) ; Pereira, H. (DAPNIA, Saclay) ; Peresedov, V. (Dubna, JINR) ; Peressounko, D.Yu. (Kurchatov Inst., Moscow) ; Petti, R. (SUNY, Stony Brook) ; Pinkenburg, C. (Brookhaven) ; Pisani, R.P. (Brookhaven) ; Proissl, M. (SUNY, Stony Brook) ; Purschke, M.L. (Brookhaven) ; Qu, H. (Abilene Christian U.) ; Rak, J. (Helsinki Inst. of Phys.) ; Ravinovich, I. (Weizmann Inst.) ; Read, K.F. (Tennessee U.) ; Reynolds, R. (SUNY, Stony Brook) ; Riabov, V. (St. Petersburg, INP) ; Riabov, Y. (St. Petersburg, INP) ; Richardson, E. (Maryland U.) ; Roach, D. (Vanderbilt U.) ; Roche, G. (Clermont-Ferrand U.) ; Rolnick, S.D. (UC, Riverside) ; Rosati, M. (Iowa State U.) ; Rukoyatkin, P. (Dubna, JINR) ; Sahlmueller, B. (SUNY, Stony Brook) ; Saito, N. (KEK, Tsukuba) ; Sakaguchi, T. (Brookhaven) ; Samsonov, V. (St. Petersburg, INP) ; Sano, M. (Tsukuba U.) ; Sarsour, M. (Georgia State U.) ; Sawada, S. (KEK, Tsukuba) ; Sedgwick, K. (UC, Riverside) ; Seidl, R. (Brookhaven) ; Sen, A. (Georgia State U.) ; Seto, R. (UC, Riverside) ; Sharma, D. (Weizmann Inst.) ; Shein, I. (Serpukhov, IHEP) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Shigaki, K. (Hiroshima U.) ; Shimomura, M. (Tsukuba U.) ; Shoji, K. (Nishina Ctr., RIKEN) ; Shukla, P. (Bhabha Atomic Res. Ctr.) ; Sickles, A. (Brookhaven) ; Silva, C.L. (Iowa State U.) ; Silvermyr, D. (Oak Ridge) ; Sim, K.S. (Korea U.) ; Singh, B.K. (Banaras Hindu U.) ; Singh, C.P. (Banaras Hindu U.) ; Singh, V. (Banaras Hindu U.) ; Slunecka, M. (Charles U.) ; Soltz, R.A. (LLNL, Livermore) ; Sondheim, W.E. (Los Alamos) ; Sorensen, S.P. (Tennessee U.) ; Soumya, M. (SUNY, Stony Brook) ; Sourikova, I.V. (Brookhaven) ; Stankus, P.W. (Oak Ridge) ; Stenlund, E. (Lund U.) ; Stepanov, M. (Massachusetts U., Amherst) ; Ster, A. (Budapest, RMKI) ; Stoll, S.P. (Brookhaven) ; Sugitate, T. (Hiroshima U.) ; Sukhanov, A. (Brookhaven) ; Sun, J. (SUNY, Stony Brook) ; Sziklai, J. (Budapest, RMKI) ; Takagui, E.M. (Sao Paulo U.) ; Takahara, A. (Tokyo U.) ; Taketani, A. (Brookhaven) ; Tanaka, Y. (Nagasaki Inst. Appl. Sci.) ; Taneja, S. (SUNY, Stony Brook) ; Tanida, K. (Seoul Natl. U.) ; Tannenbaum, M.J. (Brookhaven) ; Tarafdar, S. (Banaras Hindu U.) ; Taranenko, A. (SUNY, Stony Brook) ; Tennant, E. (New Mexico State U.) ; Themann, H. (SUNY, Stony Brook) ; Todoroki, T. (Tsukuba U.) ; Tomasek, L. (Prague, Inst. Plasma Phys.) ; Tomasek, M. (Prague, Inst. Plasma Phys.) ; Torii, H. (Hiroshima U.) ; Towell, R.S. (Abilene Christian U.) ; Tserruya, I. (Weizmann Inst.) ; Tsuchimoto, Y. (Tokyo U.) ; Tsuji, T. (Tokyo U.) ; Vale, C. (Brookhaven) ; van Hecke, H.W. (Los Alamos) ; Vargyas, M. (Eotvos U.) ; Vazquez-Zambrano, E. (Nevis Labs, Columbia U.) ; Veicht, A. (Nevis Labs, Columbia U.) ; Velkovska, J. (Vanderbilt U.) ; Vertesi, R. (Budapest, RMKI) ; Virius, M. (Prague, Tech. U.) ; Vossen, A. (Illinois U., Urbana) ; Vrba, V. (Prague, Inst. Plasma Phys.) ; Vznuzdaev, E. (St. Petersburg, INP) ; Wang, X.R. (New Mexico State U.) ; Watanabe, D. (Hiroshima U.) ; Watanabe, K. (Tsukuba U.) ; Watanabe, Y. (Brookhaven) ; Watanabe, Y.S. (Tokyo U.) ; Wei, F. (Iowa State U.) ; Wei, R. (SUNY, Stony Brook) ; White, S.N. (Brookhaven) ; Winter, D. (Nevis Labs, Columbia U.) ; Wolin, S. (Illinois U., Urbana) ; Woody, C.L. (Brookhaven) ; Wysocki, M. (Colorado U.) ; Yamaguchi, Y.L. (Tokyo U.) ; Yang, R. (Illinois U., Urbana) ; Yanovich, A. (Serpukhov, IHEP) ; Ying, J. (Georgia State U.) ; Yokkaichi, S. (Brookhaven) ; You, Z. (Los Alamos) ; Younus, I. (New Mexico U.) ; Yushmanov, I.E. (Kurchatov Inst., Moscow) ; Zajc, W.A. (Nevis Labs, Columbia U.) ; Zelenski, A. (Brookhaven) ; Zolin, L. (Dubna, JINR)

Pages: 7

Abstract: Neutral-pion, pi^0, spectra were measured at midrapidity (|y|<0.35) in Au+Au collisions at sqrt(s_NN) = 39 and 62.4 GeV and compared to earlier measurements at 200 GeV in the 1<p_T<10 GeV/c transverse-momentum (p_T) range. The high-p_T tail is well described by a power law in all cases and the powers decrease significantly with decreasing center-of-mass energy. The change of powers is very similar to that observed in the corresponding p+p-collision spectra. The nuclear-modification factors (R_AA) show significant suppression and a distinct energy dependence at moderate p_T in central collisions. At high p_T, R_AA is similar for 62.4 and 200 GeV at all centralities. Perturbative-quantum-chromodynamics calculations that describe R_AA well at 200 GeV, fail to describe the 39 GeV data, raising the possibility that the relative importance of initial-state effects and soft processes increases at lower energies. A conclusion that the region where hard processes are dominant is reached only at higher p_T, is also supported by the x_T dependence of the x_T-scaling power-law exponent.

Web-Page: http://inspirehep.net/record/1107625/files/arXiv:1204.1526.pdf; http://inspirehep.net/record/1107625/files/fig1_ab_InvYield_horizontal_final.png; http://inspirehep.net/record/1107625/files/fig3_a_RAAAveraged_pT_6_final.png; http://inspirehep.net/record/1107625/files/figs2_ab_RAAvspT_withVitev_v2_final.png; http://inspirehep.net/record/1107625/files/figs4_takao_final.png


Note: * Temporary entry *; 371 authors, 7 pages, 4 figures, and 1 table. Submitted to Phys. Rev. Lett. 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

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