Nuclear matter effects on J/psi production in asymmetric Cu+Au collisions at sqrt{s_{_{NN}}} = 200 GeV

C. Aidala , N.N. Ajitanand , Y. Akiba , R. Akimoto , J. Alexander , K. Aoki , N. Apadula , H. Asano

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E.T. Atomssa T.C. Awes B. Azmoun V. Babintsev M. Bai X. Bai B. Bannier K.N. Barish S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier R. Belmont A. Berdnikov Y. Berdnikov X. Bing D. Black D.S. Blau J. Bok K. Boyle M.L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C.Y. Chi M. Chiu I.J. Choi J.B. Choi S. Choi P. Christiansen T. Chujo V. Cianciolo B.A. Cole N. Cronin N. Crossette M. Csan\'ad T. Cs\"org\H{o} A. Datta M.S. Daugherity G. David K. Dehmelt A. Denisov A. Deshpande E.J. Desmond L. Ding J.H. Do O. Drapier A. Drees K.A. Drees J.M. Durham A. Durum L. D'Orazio T. Engelmore A. Enokizono S. Esumi K.O. Eyser B. Fadem D.E. Fields M. Finger Jr. F. Fleuret S.L. Fokin J.E. Frantz A. Franz A.D. Frawley Y. Fukao K. Gainey C. Gal P. Garg A. Garishvili I. Garishvili F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S.V. Greene M. Grosse Perdekamp Y. Gu T. Gunji H. Guragain J.S. Haggerty K.I. Hahn H. Hamagaki J. Hanks K. Hashimoto R. Hayano X. He T.K. Hemmick T. Hester J.C. Hill R.S. Hollis K. Homma B. Hong T. Hoshino J. Huang S. Huang T. Ichihara Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B.V. Jacak S.J. Jeon M. Jezghani J. Jia X. Jiang B.M. Johnson K.S. Joo D. Jouan D.S. Jumper J. Kamin S. Kanda B.H. Kang J.H. Kang J.S. Kang J. Kapustinsky D. Kawall A.V. Kazantsev J.A. Key V. Khachatryan P.K. Khandai A. Khanzadeev K.M. Kijima C. Kim D.J. Kim E.-J. Kim Y.-J. Kim Y.K. Kim E. Kistenev J. Klatsky D. Kleinjan P. Kline T. Koblesky M. Kofarago B. Komkov J. Koster D. Kotchetkov D. Kotov F. Krizek K. Kurita M. Kurosawa Y. Kwon R. Lacey Y.S. Lai J.G. Lajoie A. Lebedev D.M. Lee G.H. Lee J. Lee K.B. Lee K.S. Lee S.H. Lee M.J. Leitch M. Leitgab B. Lewis X. Li S.H. Lim M.X. Liu D. Lynch C.F. Maguire Y.I. Makdisi M. Makek A. Manion V.I. Manko E. Mannel T. Maruyama M. McCumber P.L. McGaughey D. McGlinchey C. McKinney A. Meles M. Mendoza B. Meredith Y. Miake T. Mibe A.C. Mignerey A. Milov D.K. Mishra J.T. Mitchell S. Miyasaka S. Mizuno A.K. Mohanty D.P. Morrison M. Moskowitz T.V. Moukhanova T. Murakami J. Murata T. Nagae S. Nagamiya J.L. Nagle M.I. Nagy I. Nakagawa Y. Nakamiya K.R. Nakamura T. Nakamura K. Nakano C. Nattrass P.K. Netrakanti M. Nihashi T. Niida R. Nouicer T. Novak N. Novitzky A.S. Nyanin E. O'Brien C.A. Ogilvie H. Oide K. Okada A. Oskarsson K. Ozawa R. Pak V. Pantuev V. Papavassiliou I.H. Park S. Park S.K. Park S.F. Pate L. Patel J.-C. Peng D. Perepelitsa G.D.N. Perera D.Yu. Peressounko J. Perry R. Petti C. Pinkenburg R.P. Pisani M.L. Purschke H. Qu J. Rak I. Ravinovich K.F. Read D. Reynolds V. Riabov Y. Riabov E. Richardson N. Riveli D. Roach S.D. Rolnick M. Rosati M.S. Ryu B. Sahlmueller N. Saito T. Sakaguchi H. Sako V. Samsonov M. Sarsour S. Sato S. Sawada K. Sedgwick J. Seele R. Seidl Y. Sekiguchi A. Sen R. Seto P. Sett D. Sharma A. Shaver I. Shein T.-A. Shibata K. Shigaki M. Shimomura K. Shoji P. Shukla A. Sickles C.L. Silva D. Silvermyr B.K. Singh C.P. Singh V. Singh M. Skolnik M. Slune\v{c}ka S. Solano R.A. Soltz W.E. Sondheim S.P. Sorensen M. Soumya I.V. Sourikova P.W. Stankus P. Steinberg E. Stenlund M. Stepanov A. Ster S.P. Stoll M.R. Stone T. Sugitate A. Sukhanov J. Sun A. Takahara A. Taketani K. Tanida M.J. Tannenbaum S. Tarafdar A. Taranenko E. Tennant A. Timilsina T. Todoroki M. Tom\'a\v{s}ek H. Torii R.S. Towell I. Tserruya H.W. van Hecke M. Vargyas E. Vazquez-Zambrano A. Veicht J. Velkovska R. V\'ertesi M. Virius V. Vrba E. Vznuzdaev X.R. Wang D. Watanabe K. Watanabe Y. Watanabe Y.S. Watanabe F. Wei S. Whitaker S. Wolin C.L. Woody M. Wysocki Y.L. Yamaguchi A. Yanovich S. Yokkaichi I. Yoon Z. You I. Younus I.E. Yushmanov W.A. Zajc A. Zelenski S. Zhou

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keywords directioncollisionsau-goingexpectednuclearproductionsuppressionasymmetric

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We report on $J/\psi$ production from asymmetric Cu+Au heavy-ion collisions at $\sqrt{s_{_{NN}}}$=200 GeV at the Relativistic Heavy Ion Collider at both forward (Cu-going direction) and backward (Au-going direction) rapidities. The nuclear modification of $J/\psi$ yields in Cu$+$Au collisions in the Au-going direction is found to be comparable to that in Au$+$Au collisions when plotted as a function of the number of participating nucleons. In the Cu-going direction, $J/\psi$ production shows a stronger suppression. This difference is comparable in magnitude and has the same sign as the difference expected from shadowing effects due to stronger low-$x$ gluon suppression in the larger Au nucleus. The relative suppression is opposite to that expected from hot nuclear matter dissociation, since a higher energy density is expected in the Au-going direction.

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Nuclear matter effects on J/psi production in asymmetric Cu+Au collisions at sqrt{s_{_{NN}}} = 200 GeV

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