Neutral pion production with respect to centrality and reaction plane in Au+Au collisions at √sNN=200 GeV

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题名:	Neutral pion production with respect to centrality and reaction plane in Au+Au collisions at √sNN=200 GeV
作者:	彭仁傑;Al-Bataineh, H.;Aoki, K.;Baksay, L.;Basye, A. T.;Bathe, S.;Bazilevsky, A.;Belmont, R.;Berdnikov, Y.;Bok, J. S.;Brooks, M. L.;Camacho, C. M.;Chi, C. Y.;Choi, I. J.;Chung, P.;Danchev, I.;Datta, A.;Durum, A.;Edwards, S.;Engelmore, T.;En&apos, H.;yo;Fadem, B.;Finger, M.;Fleuret, F.;Franz, A.;Frawley, A. D.;Cassagnac, R. Granier de;Grau, N.;Greene, S. V.;Perdekamp, M. Grosse;Haggerty, J. S.;Hemmick, T. K.;Hester, T.;Hill, J. C.;Homma, K.;Ichimiya, R.;Inaba, M.;Ishihara, M.;Issah, M.;Ivanischev, D.;Karatsu, K.;Kim, B. I.;Kistenev, E.;Konno, M.;Kwon, Y.;Lee, K.;Litvinenko, A.;Lynch, D.;Masui, H.;Nagle, J. L.;Naglis, M.;Nagy, M. I.;Nouicer, R.;Ogilvie, C. A.;Oka, M.;Okada, K.;Oskarsson, A.;Pak, R.;Pantuev, V.;Papavassiliou, V.;Park, W. J.;Pate, S. F.;Peresedov, V.;Purwar, A. K.;Rak, J.;Rakotozafindrabe, A.;Read, K. F.;Reygers, K.;Roach, D.;Rosati, M.;Rosen, C. A.;Sakashita, K.;Samsonov, V.;Sato, T.;Seidl, R.;Semenov, A. Yu.;Shimomura, M.;Shoji, K.;Silvestre, C.;Singh, B. K.;Sondheim, W. E.;Sorensen, S. P.;Stoll, S. P.;Sukhanov, A.;Tanida, K.;Togawa, M.;Toia, A.;Tsuchimoto, Y.;Vale, C.;Veicht, A.;Vinogradov, A. A.;Watanabe, Y.;Wood, J. P.;Wright, R. M.;Wysocki, M.;Yamaguchi, Y. L.;Yamaura, K.;Yang, R.;Yokkaichi, S.;Zajc, W. A.;Zolin, L.
贡献者:	高能與強場物理研究中心
关键词:	FOS: Physical sciences;Nuclear Experiment;Nuclear Experiment (nucl-ex)
日期:	2013-03-28
上传时间:	2026-04-23 12:05:50 (UTC+8)
出版者:	American Physical Society;American Physical Society (APS)
摘要:	摘要： The PHENIX experiment has measured the production of neutral pions in Au+Au collisions at sqrt(s_NN)=200 GeV. The new data offer a fourfold increase in recorded luminosity, providing higher precision and a larger reach in transverse momentum, p_T, to 20 GeV/c. The production ratio of eta/pi^0 is 0.46+/-0.01(stat)+/-0.05(syst), constant with p_T and collision centrality. The observed ratio is consistent with earlier measurements, as well as with the p+p and d+Au values. The production of pi^0 is suppressed by a factor of 5, as in earlier findings. However, with the improved statistical precision a small but significant rise of the nuclear modification factor, R_AA, vs p_T, with a slope of 0.0106+/-^(0.0034)_(0.0029)[GeV/c]^-1, is discernible in central collisions. A phenomenological extraction of the average fractional parton energy loss shows a decrease with increasing p_T. To study the path length dependence of suppression, the pi^0 yield was measured at different angles with respect to the event plane; a strong azimuthal dependence of the pi^0 R_AA is observed. The data are compared to theoretical models of parton energy loss as a function of the path length, L, in the medium. Models based on pQCD are insufficient to describe the data, while a hybrid model utilizing pQCD for the hard interactions and AdS/CFT for the soft interactions is consistent with the data. 383 authors, 70 institutions, 21 pages, 22 figures, 8 tables. Submitted to Phys. Rev. C. v2 has minor changes in review process. 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 出版者： American Physical Society (APS) 出版日期： 2013-03-28 出處： Physical Review C, 2013-03, Vol.87 (3) 識別號： ISSN: 0556-2813 識別號： DOI: 10.48550/arxiv.1208.2254 識別號： DOI: 10.1103/physrevc.87.034911
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