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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
  • University of Tokyo
  • New Mexico State University
  • Columbia University
  • Kyoto University
  • Brookhaven National Laboratory
  • Oak Ridge National Laboratory
  • Kurchatov Institute
  • University of California, Riverside
  • University of New Mexico
  • Baruch College
  • Petersburg Nuclear Physics Institute (PNPI)
  • Vanderbilt University
  • St. Petersburg State Polytechnical University
  • Ohio University
  • Kurchatov Institute
  • University of Illinois at Urbana-Champaign
  • Chonbuk National University
  • Seoul National University
  • Bhabha Atomic Research Centre
  • Lund University
  • University of Tsukuba
  • Eötvös Loránd University
  • Hungarian Academy of Sciences
  • UMass Amherst
  • Abilene Christian University
  • 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
  • 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
  • Tokyo Institute of Technology
  • Institute for Nuclear Research of the Russian Academy of Sciences
  • Institut Pierre Simon Laplace, CNRS and CEA
  • Université Blaise Pascal
  • Banaras Hindu University
  • Institute of Physics of the Czech Academy of Sciences

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

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.

langue originaleAnglais
Numéro d'article152301
journalPhysical Review Letters
Volume109
Numéro de publication15
Les DOIs
étatPublié - 9 oct. 2012

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