Journal
PHYSICS LETTERS B
Volume 735, Issue -, Pages 127-137Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2014.06.028
Keywords
Upsilon suppression; Quarkonium in-medium; Relativistic heavy-ion collisions; STAR
Funding
- RHIC Operations Group
- NERSC Center at LBNL
- KISTI Center in Korea
- Open Science Grid consortium
- U.S. NSF
- CNRS/IN2P3
- FAPESP-CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC
- CAS
- Korean Research Foundation, GA
- MSMT of the Czech Republic
- FIAS of Germany
- DAE
- DST
- CSIR of India
- National Science Centre of Poland
- National Research Foundation [NRF-2012004024]
- RosAtom of Russia
- RCF at BNL
- Office of NP within the U.S. DOE Office of Science
- Offices of HEP within the U.S. DOE Office of Science
- MoE of China
- MoST of China
- Ministry of Science, Education and Sports of the Republic of Croatia
- Direct For Mathematical & Physical Scien [1068833] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1404281, 1352081] Funding Source: National Science Foundation
- Division Of Physics [1068833] Funding Source: National Science Foundation
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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.
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