Suppression of Upsilon production in d plus Au and Au plus Au collisions at root S-NN=200 GeV uri icon

abstract

  • We report measurements of {hooked} meson production in p + p, d + Au, and Au + Au collisions using the STAR detector at RHIC. We compare the {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 {hooked}(1S + 2S + 3S) in the rapidity range |y| < 1 in d + Au collisions of R 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 of R 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 {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.

published proceedings

  • PHYSICS LETTERS B

altmetric score

  • 0.5

author list (cited authors)

  • Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., ... Zyzak, M.

citation count

  • 72

complete list of authors

  • 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||Bueltmann, S||Bunzarov, I||Burton, TP||Butterworth, J||Caines, H||Sanchez, M Calderon de la Barca||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||Leyva, A Davila||De Silva, LC||Debbe, RR||Dedovich, TG||Deng, J||Derevschikov, AA||de Souza, R Derradi||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||Ev

publication date

  • July 2014