Evolution of pi(0) Suppression in Au plus Au Collisions from root s(NN)=39 to 200 GeV

  • Adare, A.
  • Afanasiev, S.
  • Aidala, C.
  • Ajitanand, N. N.
  • Akiba, Y.
  • ... Kim, Yong Kyun
  • 외 366명
Citations

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46
Citations

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52

초록

Neutral-pion pi(0) spectra were measured at midrapidity (vertical bar y vertical bar < 0.35) in Au + Au collisions at root s(NN) = 39 and 62.4 GeV and compared with earlier measurements at 200 GeV in a transverse-momentum range of 1 < p(T) < 10 GeV/c. 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 spectra for p + p collisions. The nuclear modification factors (RAA) show significant suppression, with a distinct energy, centrality, and p(T) dependence. Above p(T) = 7 GeV/c, R-AA is similar for root sNN = 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, for the same p(T) region, the relative importance of initial-state effects and soft processes increases at lower energies. The p(T) range where pi(0) spectra in central Au + Au collisions have the same power as in p + p collisions is approximate to 5 and 7 GeV/c for root sNN = 200 and 62.4 GeV, respectively. For the root sNN = 39 GeV data, it is not clear whether such a region is reached, and the x(T) dependence of the x(T)-scaling power-law exponent is very different from that observed in the root sNN = 62 and 200 GeV data, providing further evidence that initial-state effects and soft processes mask the in-medium suppression of hardscattered partons to higher p(T) as the collision energy decreases.

키워드

INCLUSIVE PROCESSESColliding beam acceleratorsQuantum theory
제목
Evolution of pi(0) Suppression in Au plus Au Collisions from root s(NN)=39 to 200 GeV
저자
Adare, A.Afanasiev, S.Aidala, C.Ajitanand, N. N.Akiba, Y.Akimoto, R.Al-Ta'ani, H.Alexander, J.Angerami, A.Aoki, K.Apadula, N.Aramaki, Y.Asano, H.Aschenauer, E. C.Atomssa, E. T.Awes, T. C.Azmoun, B.Babintsev, V.Bai, M.Bannier, B.Barish, K. N.Bassalleck, B.Bathe, S.Baublis, V.Baumgart, S.Bazilevsky, A.Belmont, R.Berdnikov, A.Berdnikov, Y.Bing, X.Blau, D. S.Boyle, K.Brooks, M. L.Buesching, H.Bumazhnov, V.Butsyk, S.Campbell, S.Castera, P.Chen, C. -H.Chi, C. Y.Chiu, M.Choi, I. J.Choi, J. B.Choi, S.Choudhury, R. K.Christiansen, P.Chujo, T.Chvala, O.Cianciolo, V.Citron, Z.Cole, B. A.Connors, M.Csanad, M.Csoergo, T.Dairaku, S.Datta, A.Daugherity, M. S.David, G.Denisov, A.Deshpande, A.Desmond, E. J.Dharmawardane, K. V.Dietzsch, O.Ding, L.Dion, A.Donadelli, M.Drapier, O.Drees, A.Drees, K. A.Durham, J. M.Durum, A.D'Orazio, L.Edwards, S.Efremenko, Y. V.Engelmore, T.Enokizono, A.Esumi, S.Eyser, K. O.Fadem, B.Fields, D. E.Finger, M.Finger, M., Jr.Fleuret, F.Fokin, S. L.Frantz, J. E.Franz, A.Frawley, A. D.Fukao, Y.Fusayasu, T.Gainey, K.Gal, C.Garishvili, A.Garishvili, I.Glenn, A.Gong, X.Gonin, M.Goto, Y.de Cassagnac, R. GranierGrau, N.Greene, S. V.Perdekamp, M. GrosseGunji, T.Guo, L.Gustafsson, H. -A.Hachiya, T.Haggerty, J. S.Hahn, K. I.Hamagaki, H.Hanks, J.Hashimoto, K.Haslum, E.Hayano, R.He, X.Hemmick, T. K.Hester, T.Hill, J. C.Hollis, R. S.Homma, K.Hong, B.Horaguchi, T.Hori, Y.Huang, S.Ichihara, T.Iinuma, H.Ikeda, Y.Imrek, J.Inaba, M.Iordanova, A.Isenhower, D.Issah, M.Isupov, A.Ivanischev, D.Jacak, B. V.Javani, M.Jia, J.Jiang, X.Johnson, B. M.Joo, K. S.Jouan, D.Kamin, J.Kaneti, S.Kang, B. H.Kang, J. H.Kang, J. S.Kapustinsky, J.Karatsu, K.Kasai, M.Kawall, D.Kazantsev, A. V.Kempel, T.Khanzadeev, A.Kijima, K. M.Kim, B. I.Kim, C.Kim, D. J.Kim, E. -J.Kim, H. J.Kim, K. -B.Kim, Y. -J.Kim, Yong KyunKinney, E.Kiss, A.Kistenev, E.Klatsky, J.Kleinjan, D.Kline, P.Komatsu, Y.Komkov, B.Koster, J.Kotchetkov, D.Kotov, D.Kral, A.Krizek, F.Kunde, G. J.Kurita, K.Kurosawa, M.Kwon, Y.Kyle, G. S.Lacey, R.Lai, Y. S.Lajoie, J. G.Lebedev, A.Lee, B.Lee, D. M.Lee, J.Lee, K. B.Lee, K. S.Lee, S. H.Lee, S. R.Leitch, M. J.Leite, M. A. L.Leitgab, M.Lewis, B.Lim, S. H.Levy, L. A. LindenLitvinenko, A.Liu, M. X.Love, B.Maguire, C. F.Makdisi, Y. I.Makek, M.Malakhov, A.Manion, A.Manko, V. I.Mannel, E.Masumoto, S.McCumber, M.McGaughey, P. L.McGlinchey, D.McKinney, C.Mendoza, M.Meredith, B.Miake, Y.Mibe, T.Mignerey, A. C.Milov, A.Mishra, D. K.Mitchell, J. T.Miyachi, Y.Miyasaka, S.Mohanty, A. K.Moon, H. J.Morrison, D. P.Motschwiller, S.Moukhanova, T. V.Murakami, T.Murata, J.Nagae, T.Nagamiya, S.Nagle, J. L.Nagy, M. I.Nakagawa, I.Nakamiya, Y.Nakamura, K. R.Nakamura, T.Nakano, K.Nattrass, C.Nederlof, A.Nihashi, M.Nouicer, R.Novitzky, N.Nyanin, A. S.O'Brien, E.Ogilvie, C. A.Okada, K.Oskarsson, A.Ouchida, M.Ozawa, K.Pak, R.Pantuev, V.Papavassiliou, V.Park, B. H.Park, I. H.Park, S. K.Pate, S. F.Patel, L.Pei, H.Peng, J. -C.Pereira, H.Peresedov, V.Peressounko, D. Yu.Petti, R.Pinkenburg, C.Pisani, R. P.Proissl, M.Purschke, M. L.Qu, H.Rak, J.Ravinovich, I.Read, K. F.Reynolds, R.Riabov, V.Riabov, Y.Richardson, E.Roach, D.Roche, G.Rolnick, S. D.Rosati, M.Rukoyatkin, P.Sahlmueller, B.Saito, N.Sakaguchi, T.Samsonov, V.Sano, M.Sarsour, M.Sawada, S.Sedgwick, K.Seidl, R.Sen, A.Seto, R.Sharma, D.Shein, I.Shibata, T. -A.Shigaki, K.Shimomura, M.Shoji, K.Shukla, P.Sickles, A.Silva, C. L.Silvermyr, D.Sim, K. S.Singh, B. K.Singh, C. P.Singh, V.Slunecka, M.Soltz, R. A.Sondheim, W. E.Sorensen, S. P.Soumya, M.Sourikova, I. V.Stankus, P. W.Stenlund, E.Stepanov, M.Ster, A.Stoll, S. P.Sugitate, T.Sukhanov, A.Sun, J.Sziklai, J.Takagui, E. M.Takahara, A.Taketani, A.Tanaka, Y.Taneja, S.Tanida, K.Tannenbaum, M. J.Tarafdar, S.Taranenko, A.Tennant, E.Themann, H.Todoroki, T.Tomasek, L.Tomasek, M.Torii, H.Towell, R. S.Tserruya, I.Tsuchimoto, Y.Tsuji, T.Vale, C.van Hecke, H. W.Vargyas, M.Vazquez-Zambrano, E.Veicht, A.Velkovska, J.Vertesi, R.Virius, M.Vossen, A.Vrba, V.Vznuzdaev, E.Wang, X. R.Watanabe, D.Watanabe, K.Watanabe, Y.Watanabe, Y. S.Wei, F.Wei, R.White, S. N.Winter, D.Wolin, S.Woody, C. L.Wysocki, M.Yamaguchi, Y. L.Yang, R.Yanovich, A.Ying, J.Yokkaichi, S.You, Z.Younus, I.Yushmanov, I. E.Zajc, W. A.Zelenski, A.Zolin, L.
DOI
10.1103/PhysRevLett.109.152301
발행일
2012-10
유형
Article
저널명
Physical Review Letters
109
15
페이지
1 ~ 7

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