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Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV

  • A. Adare
  • , S. Afanasiev
  • , C. Aidala
  • , N. N. Ajitanand
  • , Y. Akiba
  • , R. Akimoto
  • , H. Al-Ta'Ani
  • , J. Alexander
  • , A. Angerami
  • , K. Aoki
  • , N. Apadula
  • , Y. Aramaki
  • , H. Asano
  • , E. C. Aschenauer
  • , E. T. Atomssa
  • , T. C. Awes
  • , B. Azmoun
  • , V. Babintsev
  • , M. Bai
  • , B. Bannier
  • K. N. Barish, B. Bassalleck, S. Bathe, V. Baublis, S. Baumgart, A. Bazilevsky, R. Belmont, A. Berdnikov, Y. Berdnikov, X. Bing, D. S. Blau, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, S. Butsyk, S. Campbell, P. Castera, C. H. Chen, C. Y. Chi, M. Chiu, I. J. Choi, J. B. Choi, S. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, M. Connors, M. Csanád, T. Csörgo, S. Dairaku, A. Datta, M. S. Daugherity, G. David, A. Denisov, A. Deshpande, E. J. Desmond, K. V. Dharmawardane, O. Dietzsch, L. Ding, A. Dion, M. Donadelli, O. Drapier, A. Drees, K. A. Drees, J. M. Durham, A. Durum, L. D'Orazio, S. Edwards, Y. V. Efremenko, T. Engelmore, A. Enokizono, S. Esumi, K. O. Eyser, B. Fadem, D. E. Fields, M. Finger, M. Finger, F. Fleuret, S. L. Fokin, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukao, T. Fusayasu, K. Gainey, C. Gal, A. Garishvili, I. Garishvili, A. Glenn, X. Gong, M. Gonin, Y. Goto, R. Granier De Cassagnac, N. Grau, S. V. Greene, M. Grosse Perdekamp, T. Gunji, L. Guo, H. A. Gustafsson, T. Hachiya, J. S. Haggerty, K. I. Hahn, H. Hamagaki, J. Hanks, K. Hashimoto, E. Haslum, R. Hayano, X. He, T. K. Hemmick, T. Hester, J. C. Hill, R. S. Hollis, K. Homma, B. Hong, T. Horaguchi, Y. Hori, S. Huang, T. Ichihara, H. Iinuma, Y. Ikeda, J. Imrek, M. Inaba, A. Iordanova, D. Isenhower, M. Issah, A. Isupov, D. Ivanischev, B. V. Jacak, M. Javani, J. Jia, X. Jiang, B. M. Johnson, K. S. Joo, D. Jouan, J. Kamin, S. Kaneti, B. H. Kang, J. H. Kang, J. S. Kang, J. Kapustinsky, K. Karatsu, M. Kasai, D. Kawall, A. V. Kazantsev, T. Kempel, A. Khanzadeev, K. M. Kijima, B. I. Kim, C. Kim, D. J. Kim, E. J. Kim, H. J. Kim, K. B. Kim, Y. J. Kim, Y. K. Kim, E. Kinney, A. Kiss, E. Kistenev, J. Klatsky, D. Kleinjan, P. Kline, Y. Komatsu, B. Komkov, J. Koster, D. Kotchetkov, D. Kotov, A. Král, F. Krizek, G. J. Kunde, K. Kurita, M. Kurosawa, Y. Kwon, G. S. Kyle, R. Lacey, Y. S. Lai, J. G. Lajoie, A. Lebedev, B. Lee, D. M. Lee, J. Lee, K. B. Lee, K. S. Lee, S. H. Lee, S. R. Lee, M. J. Leitch, M. A.L. Leite, M. Leitgab, B. Lewis, S. H. Lim, L. A. Linden Levy, A. Litvinenko, M. X. Liu, B. Love, C. F. Maguire, Y. I. Makdisi, M. Makek, A. Malakhov, A. Manion, V. I. Manko, E. Mannel, S. Masumoto, M. McCumber, P. L. McGaughey, D. McGlinchey, C. McKinney, M. Mendoza, B. Meredith, Y. Miake, T. Mibe, A. C. Mignerey, A. Milov, D. K. Mishra, J. T. Mitchell, Y. Miyachi, S. Miyasaka, A. K. Mohanty, H. J. Moon, D. P. Morrison, S. Motschwiller, T. V. Moukhanova, T. Murakami, J. Murata, T. Nagae, S. Nagamiya, J. L. Nagle, M. I. Nagy, I. Nakagawa, Y. Nakamiya, K. R. Nakamura, T. Nakamura, K. Nakano, C. Nattrass, A. Nederlof, M. Nihashi, R. Nouicer, N. Novitzky, A. S. Nyanin, E. O'Brien, C. A. Ogilvie, K. Okada, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, V. Pantuev, V. Papavassiliou, B. H. Park, I. H. Park, S. K. Park, S. F. Pate, L. Patel, H. Pei, J. C. Peng, H. Pereira, V. Peresedov, D. Yu Peressounko, R. Petti, C. Pinkenburg, R. P. Pisani, M. Proissl, M. L. Purschke, H. Qu, J. Rak, I. Ravinovich, K. F. Read, R. Reynolds, V. Riabov, Y. Riabov, E. Richardson, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, P. Rukoyatkin, B. Sahlmueller, N. Saito, T. Sakaguchi, V. Samsonov, M. Sano, M. Sarsour, S. Sawada, K. Sedgwick, R. Seidl, A. Sen, R. Seto, D. Sharma, I. Shein, T. A. Shibata, K. Shigaki, M. Shimomura, K. Shoji, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, K. S. Sim, B. K. Singh, C. P. Singh, V. Singh, M. Slunečka, R. A. Soltz, W. E. Sondheim, S. P. Sorensen, M. Soumya, I. V. Sourikova, P. W. Stankus, E. Stenlund, M. Stepanov, A. Ster, S. P. Stoll, T. Sugitate, A. Sukhanov, J. Sun, J. Sziklai, E. M. Takagui, A. Takahara, A. Taketani, Y. Tanaka, S. Taneja, K. Tanida, M. J. Tannenbaum, S. Tarafdar, A. Taranenko, E. Tennant, H. Themann, T. Todoroki, L. Tomáek, M. Tomáek, H. Torii, R. S. Towell, I. Tserruya, Y. Tsuchimoto, T. Tsuji, C. Vale, H. W. Van Hecke, M. Vargyas, E. Vazquez-Zambrano, A. Veicht, J. Velkovska, R. Vértesi, M. Virius, A. Vossen, V. Vrba, E. Vznuzdaev, X. R. Wang, D. Watanabe, K. Watanabe, Y. Watanabe, Y. S. Watanabe, F. Wei, R. Wei, S. N. White, D. Winter, S. Wolin, C. L. Woody, M. Wysocki, Y. L. Yamaguchi, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, Z. You, I. Younus, I. E. Yushmanov, W. A. Zajc, A. Zelenski, L. Zolin
  • University of Colorado Boulder
  • Joint Institute for Nuclear Research, Dubna
  • MST-8, Los Alamos National Laboratory
  • Stony Brook University
  • RIKEN Nishina Center for Accelerator-Based Science
  • Riken BNL Research Center
  • Center for Nuclear Study
  • University of Tokyo
  • New Mexico State University
  • Columbia University
  • Kyoto University
  • Physics Department
  • Brookhaven National Laboratory
  • Oak Ridge National Laboratory
  • Kurchatov Institute
  • Collider-Accelerator Department
  • University of California, Riverside
  • University of New Mexico
  • Baruch College
  • Petersburg Nuclear Physics Institute (PNPI)
  • Vanderbilt University
  • St. Petersburg State Polytechnical University
  • Astrophysical Institute
  • Ohio University
  • Kurchatov Institute
  • University of Illinois at Urbana-Champaign
  • Chonbuk National University
  • Department of Physics and Astronomy
  • Seoul National University
  • Bhabha Atomic Research Centre
  • Department of Physics
  • Lund University
  • Institute of Physics
  • University of Tsukuba
  • Eötvös Loránd University
  • Institute for Particle and Nuclear Physics
  • Hungarian Academy of Sciences
  • Department of Physics
  • UMass Amherst
  • Abilene Christian University
  • Instituto de Fisica
  • University of São Paulo
  • Iowa State University
  • University of Maryland, College Park
  • Muhlenberg College
  • Charles University
  • Florida State University
  • Nagasaki Institute of Applied Science
  • University of Tennessee
  • Lawrence Livermore National Laboratory
  • Ewha Womans University
  • Department of Physics
  • Rikkyo University
  • Georgia State University
  • Hiroshima University
  • Korea University
  • High Energy Accelerator Research Organization (KEK)
  • University of Debrecen
  • Myongji University
  • Université Paris-Saclay
  • Hanyang University
  • Yonsei University
  • University of Jyväskylä
  • Czech Technical University in Prague
  • Weizmann Institute of Science Israel
  • Department of Physics
  • Tokyo Institute of Technology
  • Institute for Nuclear Research of the Russian Academy of Sciences
  • Institut Pierre Simon Laplace, CNRS and CEA
  • Université Blaise Pascal
  • Department of Physics
  • Banaras Hindu University
  • Institute of Physics of the Czech Academy of Sciences

Research output: Contribution to journal › Article › peer-review

52 Citations (Scopus)

Abstract

Neutral-pion π0 spectra were measured at midrapidity (|y|<0.35) in Au+Au collisions at √sNN=39 and 62.4GeV and compared with earlier measurements at 200GeV in a transverse-momentum range of 1<p T<10GeV/c. The high-pT 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 spectra for p+p collisions. The nuclear modification factors (RAA) show significant suppression, with a distinct energy, centrality, and pT dependence. Above pT=7GeV/c, R AA is similar for √sNN=62.4 and 200GeV at all centralities. Perturbative-quantum-chromodynamics calculations that describe RAA well at 200GeV fail to describe the 39GeV data, raising the possibility that, for the same pT region, the relative importance of initial-state effects and soft processes increases at lower energies. The p T range where π0 spectra in central Au+Au collisions have the same power as in p+p collisions is 5 and 7GeV/c for √sNN=200 and 62.4GeV, respectively. For the √sNN=39GeV data, it is not clear whether such a region is reached, and the xT dependence of the xT-scaling power-law exponent is very different from that observed in the √sNN=62 and 200GeV data, providing further evidence that initial-state effects and soft processes mask the in-medium suppression of hard-scattered partons to higher pT as the collision energy decreases.

Original languageEnglish
Article number152301
JournalPhysical Review Letters
Volume109
Issue number15
DOIs
Publication statusPublished - 9 Oct 2012

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