System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions at $\sqrt{s_{_{NN}}}$=200 GeV

A Adare,P L Mcgaughey,H Iinuma,A Morreale,C R Cleven,T Fusayasu,J Kikuchi,T Chujo,R Seidl,C Maguire,Pauchoo Chung,J Jin,Taewoo Lee,David C Lynch,H Masui,A Franz,K S Sim,Hirohide Ohnishi,A Litvinenko,T Csorgo,E Haslum,Yoichiro Watanabe,C Aidala,S Mioduszewski,K Das,A K Dubey,M J Tannenbaum,A Rakotozafindrabe,S N White,T V Moukhanova,A Drees,A Toia, Xiuzhen He,S Batsouli, Y Miake,J P Wessels,N Grau, Jaesung Park,B V Jacak,S Chernichenko,A Shevel,F Ellinghaus,L Kochenda,V Pantuev, V Papavassiliou,J Gosset,M Togawa,M Gonin,M Slunecka,M J Leitch,M Finger,D P Morrison,B Bassalleck,J S Haggerty,J Velkovska,V I Manko,S F Pate,C Haegemann, Kitao Fujiwara,J Seele,Yue Shi Lai,Xuewei Li,H Torii,G R Young,E Kistenev,Y Riabov,W E Sondheim,H Pereira,A Durum,N Kamihara,K Tanida,M Csanad,D Isenhower,Takanori Sakaguchi,I Nakagawa,K N Barish,E T Atomssa,M L Brooks,K Boyle,J Asai,A Ster,V Bumazhnov,P A Rukoyatkin,K Shigaki,B Lenzi,B S Chang,S L Fokin,N Kurihara,T Tabaru, Guillaume De La Roche,D Kotchetkov,S Nagamiya,L Baksay,T Gunji,Y Nakamiya,M X Liu,V Baublis,Shunichi Sato,S V Greene,D Yu Peressounko,T Liska, S Esumi,T Isobe,Masayuki Inaba,B Hong,G Baksay,J Murata,S Oda,T Nakamura, A Z Kiss,Shingo Sakai,J Newby,M Ouchida,R Granier De Cassagnac,D Mukhopadhyay,D Winter,M K Lee, A Vinogradov,N Apadula,R Armendariz,M Reuter, D Denterria,M B Deaton,I Garishvili,L Tomasek, M A L Leite,V Singh,Dong Min Lee,M Virius,M L Purschke,H Kanou,A Soldatov,F Fleuret,A Yanovich,Hao Pei,S P Stoll, S S E Rosendahl,Yorinao Inoue,J Kamin,O Jinnouchi,D Hornback,A S Nyanin,T A Shibata, R A Bennett,D Mcglinchey,A Kravitz,M Mitrovski,K Kurita,J C Hill,H Hiejima,Vn Tram,M P Comets,Y Tanaka,R S Towell,H Delagrange,Jinfeng Jia,O Zaudtke,D N Sharma,S Gadrat, E Kinney,A Dion,R Pak,Y Berdnikov, R Seto,I V Sourikova, E Obrien,T Hachiya,Kohzoh Imai, A S Denisov,M Grosse Perdekamp,A Churyn,Serguei Afanasiev, P Rosnet,H A Gustafsson,E Kim,T E Miller,I Younus,Kenji Miki,F Kajihara,L Zolin,J Rak,M Shimomura,B Azmoun,A Bazilevsky,H Albataineh,O Drapier, G David,M Chiu,D E Fields,P Constantin,S Belikov,V Riabov,M Donadelli,K O Eyser,C P Singh,T K Hemmick,Mikio Oka,Huili Gong,H Borel,B Love,J L Charvet,S Skutnik,C L Woody,S Butsyk,L Masek,F Matathias,T Dahms,B M Johnson,Shuichi Takagi,C Silvestre,Andrey V Kozlov,I Ravinovich,F Staley,A Kiyomichi,S Zhou,Weibo Xie,X R Wang,S H Aronson,A Malakhov,S P Sorensen,K F Read,J E Frantz,R S Hayano,Z Fraenkel,G J Kunde,Y Goto,M D Malik,H Enyo,A Kral,B Norman, M Hohlmann,I E Yushmanov,E M Takagui,A Hadj Henni, C Suire,D Jouan,M Nguyen,J T Mitchell,R Vertesi,M Heffner,V Babintsev,S Yokkaichi,R A Soltz,Kensuke Homma,David A Walker,A Sickles,I J Choi,A V Kazantsev,M Issah,A K Purwar, A Oskarsson, A Milov,V Cianciolo,K Dehmelt,Nagahiro Saito,S Rembeczki, E Stenlund,T Sugitate,A A Bickley,K Reygers,M Rosati,A D Frawley,J Zimanyi,V Dzhordzhadze,H Valle, M E Stepanov,P D Barnes,C Zhang, Y Yamaguchi,M Wysocki,C Kleinboesing, James Pellegrino Alexander, Masakazu Konno,R Hobbs,N N Ajitanand,H Buesching,G S Kyle, A Lebedev,K S Joo,D Kawall,C Vale,Y Tsuchimoto,K Aoki,J Sziklai,J G Lajoie,T L Thomas,V K Semenov,C Pinkenburg,J Egdemir,Y Nagata,K Ozawa,G Bunce,Rui Han,T C Awes,C Y Chi,E J Desmond,V Samsonov,J C Peng,D Silvermyr,J Kubart,V L Rykov,L Aphecetche,Yoshio Fukao, Kazumi Nakano,S Bathe,Y I Makdisi,Y Kwon,A Taketani,O Dietzsch,O O Omiwade, H Hamagaki,M Ishihara,B Sahlmueller,P Mikes,J Chiba,K Shoji,I Shein,Z Yasin,B A Cole,S Kametani,Kiyoki Okada,J Ying,A Romana,T Ichihara,R Nouicer,Y V Efremenko,Shigeki Sawada,S A Campbell,D Pal, Mamata Mishra,T Hester,H Qu,H Sakata,M J Kweon,Dong Joon Kim,L Isenhower,E P Hartouni,V Kochetkov, A Baldisseri, R Averbeck,A Isupov,H W Van Hecke, Michael R Wagner, V Vrba,W A Zajc,W S Emam,R Lacey,M Kaneta,T Horaguchi,I Tserruya,Y Mao, J Tojo,B Komkov,K Haruna,C A Ogilvie,S Baumgart,A Glenn, W J Park,C L Silva,J Klay,J M Durham,Y Akiba,E Vznuzdaev,J G Boissevain,V Peresedov,M Naglis,P Tarjan,A Taranenko,J L Nagle,P W Stankus, J H Kang,W Holzmann,A P T Palounek,A Enokizono,A Deshpande,Hiroshi Harada,M Mccumber,A Khanzadeev

PHYSICAL REVIEW C（2014）

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摘要

The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open-heavy-flavor production in Cu + Cu collisions at v root s(NN) = 200 GeV through the measurement of electrons at midrapidity that originate from semileptonic decays of charm and bottom hadrons. In peripheral Cu + Cu collisions an enhanced production of electrons is observed relative to p + p collisions scaled by the number of binary collisions. In the transverse momentum range from 1 to 5 GeV/c the nuclear modification factor is R-AA similar to 1.4. As the system size increases to more central Cu + Cu collisions, the enhancement gradually disappears and turns into a suppression. For p(T) > 3 GeV/c, the suppression reaches R-AA similar to 0.8 in the most central collisions. The p(T) and centrality dependence of R-AA in Cu + Cu collisions agree quantitatively with R-AA in d + Au and Au + Au collisions, if compared at a similar number of participating nucleons < N-part >.

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