Nuclear effects on hadron production ind+Aucollisions atsNN=200GeV revealed by comparison withp+pdata

S S Adler,M J Kweon,M L Brooks,R K Choudhury,D Kotchetkov,H Delagrange,T Ichihara,A Lebedev,M Gonin,H Buesching,F Fleuret,G S Kyle,M Konno,J M Burward-Hoy,B Bassalleck,J M Heuser,H Hiejima,A Drees,V Samsonov,I Tserruya,J L Drachenberg,P Rosnet,W J Park,J L Nagle,N N Ajitanand,M P Comets,R P Pisani,K Imai,E J Desmond,Y Tsuchimoto,J Zimányi,D Mukhopadhyay,A Romana,S S Ryu,E Vznuzdaev,S Butsyk,K Kurita,A Milov,T Hachiya,S C Johnson,T J Uam,D Jouan,A Durum,Y I Makdisi,P Chand,M Muniruzzaman,G C Mishra,T Nakamura,A Ster,S Sakai,V Dzhordzhadze,T E Miller,Y Cobigo,E M Takagui,V L Rykov,C L Woody,E Stenlund,S H Aronson,S Bathe,S P Stoll,T Chujo,H Pereira,M Togawa,M X Liu,S Kametani,J Tojo,G Bunce,M Harvey,O Drapier,S Chernichenko,A Denisov,K S Sim,D M Lee,A V Kazantsev,C Pinkenburg,E P Hartouni,F Staley,I Ravinovich,M Velkovsky,R Hayano,Y V Efremenko,A Taranenko,T K Shea,S Afanasiev,F K Wohn,B M Johnson,R Santo,J G Boissevain,P Tarján,L Kochenda,S Yokkaichi,R S Towell,Y Watanabe,A Deshpande,R Kohara,A Pierson,J H Kang,A Kozlov,V Babintsev,N Tyurin,N Grau,S Nagamiya,Y Riabov,M J Tannenbaum,K Hasuko,V V Ikonnikov,B D Fox,M C Mccain,L Aphecetche,K Das,K Oyama,R Granier De Cassagnac,J Chiba,M Rosati,Y Fukao,J G Lajoie,T Horaguchi,S Batsouli,S Esumi,D Isenhower,A Soldatov,I E Yushmanov,Y Tanaka,G R Young,V Papavassiliou,F Matathias,C A Ogilvie,G Roche,J E Frantz,K N Barish,C H Kuberg,O Dietzsch,H Lim,R Averbeck,D E Fields,A Malakhov,K Tanida,W C Chang,E Kinney,M Inuzuka,K F Read,A Franz,A Yanovich,R A Soltz,I J Choi,V Baublis,M Issah,T K Hemmick,P W Stankus,T C Awes,A Taketani,A Hoover,N Kamihara,D J Kim,B Komkov,Y Le Bornec,J P Sullivan,W A Zajc,A K Purwar,H W Van Hecke,J Jia,S Zhou,D P Morrison,J Park,M Stepanov,L Isenhower,J Newby,E Kistenev,T L Thomas,V Pantuev,N Willis,F Kajihara,Y Akiba,S Mioduszewski,I Otterlund,K Ozawa,M L Purschke,Y Goto,A Bazilevsky,M Heffner,S F Pate,W E Sondheim,V Bumazhnov,K Katou,D Pal,W Xie,K Okada,N Bruner,J Nystrand,V Semenov,V Kochetkov,I V Sourikova,M J Leitch,A Devismes,M A L Leite,I D Ojha,R Seto,I Shein,A Kiyomichi,M Chiu,A Al-Jamel,Z Fraenkel,P J Kroon,J C Hill,V Cianciolo,S Leckey,M Grosse Perdekamp,T Matsumoto,X H Li,S Kelly,J S Haggerty,H Masui,V Peresedov,X R Wang,A D Frawley,T Sugitate,L Sanfratello,R Lacey,B Khachaturov,Y Mao,A Isupov,G David,W Holzmann,M T Bjorndal,X Camard,A K Mohanty,A Baldisseri,S Sawada,J Rak,P L Mcgaughey,D Bucher,M Ishihara,L Zolin,B Cole ,C Y ,М А Volkov ,H Tydesjö,O Jinnouchi,G J Kunde,T Csörgõ ,S White ,S Greene ,G Martı́nez ,C L Silva,D Dutta,H Hamagaki,C A Aidala ,N Saito,Hisao Kobayashi ,A Hansen ,D S Brown,H Sato ,J M Qualls,C Finck,D D’enterria ,P Hidas,G B Kim ,А Виноградов ,J M Moss,С Беликов ,R Arméndariz ,H J Kim,A Öskarsson ,J P Cussonneau,K Homma,M Reuter,E O’brien ,M Inaba,S Y Fung ,E Kim,J Gösset ,S Sörensen ,J C Peng ,Kazuhiro Tanaka ,S Takagi,B Jacak ,J Velkovska,A P.t Palounek ,K Reygers,S Fokin ,Kazuo Aoki ,M Shimomura,H Torii,Y Kwon,A Nyanin ,T Sakaguchi,K S Joo,S S.e Rosendahl ,H Ohnìshì ,X He,M Csanád,B Hong,S Gadrat,A Litvinenko,P D Barnes,Á Kiss ,Jun Kikuchi ,F Deák ,J Alexander,K Shigaki,Susumu Sato ,J T Mitchell,V.n Penev ,D Silvermyr,M Kaneta,T A Shibata ,H Pei,V Manko ,A Glenn,Y Miake,A Khanzadeev,Y Schütz ,H Borel,M Germain,P Constantin,V Veszprémi,C Zhang,A M Sickles ,H.-Å Gustafsson,H En’yo ,T Kawabata,R Hobbs,V N Tram ,Christian Klein-Boesing ,H Okada,F Bauer,B Espagnon,V Riabov,C Maguire ,Xiaopeng Zong

doi:10.1103/physrevc.74.024904

Abstract

PHENIX has measured the centrality dependence of midrapidity pion, kaon, and proton transverse momentum distributions in d+Au and p+p collisions at root s(NN) = 200 GeV. The p+p data provide a reference for nuclear effects in d+Au and previously measured Au+Au collisions. Hadron production is enhanced in d+Au, relative to independent nucleon-nucleon scattering, as was observed in lower energy collisions. The nuclear modification factor for (anti)protons is larger than that for pions. The difference increases with centrality but is not sufficient to account for the abundance of baryon production observed in central Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The centrality dependence in d+Au shows that the nuclear modification factor increases gradually with the number of collisions encountered by each participant nucleon. We also present comparisons with lower energy data as well as with parton recombination and other theoretical models of nuclear effects on particle production.

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