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Suppression of Υ{hooked} production in d + Au and Au + Au collisions at sNN=200GeV

  • Author(s): Adamczyk, L
  • Adkins, JK
  • Agakishiev, G
  • Aggarwal, MM
  • Ahammed, Z
  • Alekseev, I
  • Alford, J
  • Anson, CD
  • Aparin, A
  • Arkhipkin, D
  • Aschenauer, EC
  • Averichev, GS
  • Balewski, J
  • Banerjee, A
  • Barnovska, Z
  • Beavis, DR
  • Bellwied, R
  • Bhasin, A
  • Bhati, AK
  • Bhattarai, P
  • Bichsel, H
  • Bielcik, J
  • Bielcikova, J
  • Bland, LC
  • Bordyuzhin, IG
  • Borowski, W
  • Bouchet, J
  • Brandin, AV
  • Brovko, SG
  • Bültmann, S
  • Bunzarov, I
  • Burton, TP
  • Butterworth, J
  • Caines, H
  • Calderon de la Barca Sanchez, M
  • Cebra, D
  • Cendejas, R
  • Cervantes, MC
  • Chaloupka, P
  • Chang, Z
  • Chattopadhyay, S
  • Chen, HF
  • Chen, JH
  • Chen, L
  • Cheng, J
  • Cherney, M
  • Chikanian, A
  • Christie, W
  • Chwastowski, J
  • Codrington, MJM
  • Corliss, R
  • Cramer, JG
  • Crawford, HJ
  • Cui, X
  • Das, S
  • Davila Leyva, A
  • De Silva, LC
  • Debbe, RR
  • Dedovich, TG
  • Deng, J
  • Derevschikov, AA
  • Derradi de Souza, R
  • Dhamija, S
  • di Ruzza, B
  • Didenko, L
  • Dilks, C
  • Ding, F
  • Djawotho, P
  • Dong, X
  • Drachenberg, JL
  • Draper, JE
  • Du, CM
  • Dunkelberger, LE
  • Dunlop, JC
  • Efimov, LG
  • Engelage, J
  • Engle, KS
  • Eppley, G
  • Eun, L
  • Evdokimov, O
  • Fatemi, R
  • Fazio, S
  • Fedorisin, J
  • Filip, P
  • Finch, E
  • Fisyak, Y
  • Flores, CE
  • Gagliardi, CA
  • Gangadharan, DR
  • Garand, D
  • Geurts, F
  • Gibson, A
  • Girard, M
  • Gliske, S
  • Grosnick, D
  • Guo, Y
  • Gupta, A
  • Gupta, S
  • Guryn, W
  • Haag, B
  • et al.
Abstract

We report measurements of Υ{hooked} meson production in p + p, d + Au, and Au + Au collisions using the STAR detector at RHIC. We compare the Υ{hooked} 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 Υ{hooked}(1S + 2S + 3S) in the rapidity range |y| < 1 in d + Au collisions ofR dAu= 0.79 ± 0.24(stat.) ± 0.03(syst.) ± 0.10(p + psyst.). 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 ofR A A= 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 Υ{hooked} 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. © 2014.

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