标题:Suppression of Upsilon production in d plus Au and Au plus Au collisions at root S-NN=200 GeV
作者:Adamczyk, L.; Adkins, J. K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Alford, J.; Anson, C. D.; Aparin, A.; Arkhi 更多
作者机构:[Adamczyk, L.; Przybycien, M.] AGH Univ Sci & Technol, Krakow, Poland.; [Gliske, S.; Krueger, K.; Margetis, S.; Spinka, H. M.; Underwood, D. G.] Arg 更多
通讯作者:Sanchez, MCD
通讯作者地址:[Sanchez, MCD]Univ Calif Davis, Davis, CA 95616 USA.
来源:PHYSICS LETTERS B
出版年:2014
卷:735
页码:127-137
DOI:10.1016/j.physletb.2014.06.028
关键词:Upsilon suppression; Quarkonium in-medium; Relativistic heavy-ion; collisions; STAR
摘要:We report measurements of Upsilon meson production in p + p, d + Au, and Au + Au collisions using the STAR detector at RHIC. We compare the Upsilon yield to the measured cross section in p + p collisions in order to quantify any modifications of the yield in cold nuclear matter using d + Au data and in hot nuclear matter using Au + Au data separated into three centrality classes. Our p + p measurement is based on three times the statistics of our previous result. We obtain a nuclear modification factor for Upsilon (1S + 2S + 3S) in the rapidity range vertical bar y vertical bar < 1 in d + Au collisions of R-dAu = 0.79 +/- 0.24(stat.) +/- 0.03(syst.) +/- 0.10(p + p syst.). A comparison with models including shadowing and initial state parton energy loss indicates the presence of additional cold-nuclear matter suppression. Similarly, in the top 10% most-central Au + Au collisions, we measure a nuclear modification factor of R-AA = 0.49 +/- 0.1(stat.) +/- 0.02(syst.) +/- 0.06(p + p syst.), which is a larger suppression factor than that seen in cold nuclear matter. Our results are consistent with complete suppression of excited-state Upsilon mesons in Au + Au collisions. The additional suppression in Au + Au is consistent with the level expected in model calculations that include the presence of a hot, deconfined Quark-Gluon Plasma. However, understanding the suppression seen in d + Au is still needed before any definitive statements about the nature of the suppression in Au + Au can be made. (C) 2014 The Authors. Published by Elsevier B.V.
收录类别:SCIE
WOS核心被引频次:49
资源类型:期刊论文
TOP