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 , Ryoichi Akimoto , J P Alexander , Kazuhiro Aoki , N Apadula , H Asano , 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 , Douglas L Black , D Blau , Jinwoong Bok , K Boyle , M L Brooks , J Bryslawskyj , H Buesching , V Bumazhnov , S Butsyk , Simon F Campbell , C H Chen , C Y Chi , M Chiu , Il Ju Choi , Jae Bang Choi , Sungho Choi , P Christiansen , T Chujo , V Cianciolo , B A Cole , N J Cronin , N Crossette , M Csanad , T Csorgő , A K Datta , M Daugherity , G David , K Dehmelt , A Denisov , A Deshpande , E J Desmond , Ling Ding , J H Do , O Drapier , A Drees , K A Drees , J M Durham , A Durum , L Dorazio , T Engelmore , A Enokizono , S Esumi , K O Eyser , B Fadem , D E Fields , M Finger , Frederic Fleuret , S L Fokin , J E Frantz , A Franz , A D Frawley , Y Fukao , K Gainey , C Gal , Pankaj Garg , A Garishvili , I Garishvili , F Giordano , A Glenn , Xiaojing Gong , M Gonin , Y Goto , R Granier De Cassagnac , N Grau , S V Greene , M Grosse Perdekamp , Yuzong Gu , T Gunji , H Guragain , J S Haggerty , K I Hahn , H Hamagaki , J Hanks , Kengo Hashimoto , R S Hayano , Xiaoxiao He , T K Hemmick , T Hester , J C Hill , R S Hollis , K Homma , Byungyou Hong , Tomoyuki Hoshino , Jianguo Huang , S Huang , T Ichihara , Y Ikeda , Koji 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 , Seiichi Kanda , Byung Ha Kang , J H Kang , J S Kapustinsky , D Kawall , A V Kazantsev , J A Key , V Khachatryan , P K Khandai , A Khanzadeev , K M Kijima , C Kim , Dae Jung Kim , Eung Ju Kim , Y J Kim , E Kistenev , J Klatsky , D Kleinjan , P Kline , T Koblesky , Monika Kofarago , B Komkov , Jan Koster , D Kotchetkov , D Kotov , F Krizek , K Kurita , M Kurosawa , Y Kwon , R F Lacey , Yue Shi Lai , J G Lajoie , A Lebedev , D M Lee , Guan Huei Lee , Jongwon Lee , Kyong Sei Lee , S H Lee , M J Leitch , M Leitgab , Basil S Lewis , Xiaoran Li , Seong Hoon Lim , M X Liu , David A Lynch , C Maguire , Y I Makdisi , M Makek , A Manion , V I Manko , E Mannel , Takeo Maruyama , M Mccumber , P L Mcgaughey , D Mcglinchey , C Mckinney , A Meles , M E 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 , Michael A Moskowitz , T V Moukhanova , Tetsuya Murakami , Junji Murata , T Nagae , S Nagamiya , J L Nagle , M I Nagy , I Nakagawa , Y Nakamiya , K Nakamura , Tetsuya Nakamura , Kaoru Nakano , C Nattrass , P K Netrakanti , M Nihashi , T Niida , R Nouicer , Tomas Novak , N Novitzky , A S Nyanin , Eugene J Obrien , C A Ogilvie , Hideyuki Oide , Kei Okada , , Kazue Ozawa , R Pak , V Pantuev , V Papavassiliou , I H Park , Sang Keun Park , S F Pate , L Patel , J C Peng , Dennis Perepelitsa , G D N Perera , D Yu Peressounko , J Perry , R Petti , C Pinkenburg , R P Pisani , M L Purschke , Huimin Qu , J Rak , I Ravinovich , K F Read , Daniel R Reynolds , Viktor Riabov , Y Riabov , E H Richardson , N Riveli , D Roach , S D Rolnick , M Rosati , Min Sang 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 , Arunabha Sen , R Seto , P Sett , D P Sharma , Alan Shaver , I Shein , T A Shibata , K Shigaki , M Shimomura , K Shoji , P K Shukla , A Sickles , C L Silva , D Silvermyr , B K Singh , C P Singh , V Singh , M Skolnik , M Slunecka , S Solano , R A Soltz , W E Sondheim , S P Sorensen , M Soumya , I V Sourikova , P W Stankus , Peter Steinberg , E Stenlund , M Stepanov , A Ster , S P Stoll , M R Stone , T Sugitate , A Sukhanov , Jian Sun , Atsushi Takahara , A Taketani , K Tanida , M J Tannenbaum , S Tarafdar , A Taranenko , E Tennant , A Timilsina , T Todoroki , M Tomasek , H Torii , R S Towell , I Tserruya , H W Van Hecke , Marton Vargyas , E Vazquezzambrano , A Veicht , J Velkovska , R Vertesi , M Virius , V Vrba , E Vznuzdaev , X R Wang , Denjiro Watanabe , Ken Watanabe , Y Watanabe , Fangfei Wei , S P Whitaker , S Wolin , C L Woody , M Wysocki , Y Yamaguchi , A Yanovich , S Yokkaichi , I Yoon , Z You , I Younus , I E Yushmanov , W A Zajc , A Zelenski , S Zhou PHYSICAL REVIEW C（2014）
摘要
We report on J/psi production from asymmetric Cu + Au heavy-ion collisions at root 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 inAu + 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.
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