Suppression Pattern of Neutral Pions at High Transverse Momentum inAu+AuCollisions atsNN=200  GeVand Constraints on Medium Transport Coefficients

A Adare,D D’Enterria,A Milov,S P Stoll,Y Goto,J Nystrand,E O’Brien,J Chiba,J Kamin,O Zaudtke,F Ellinghaus,M Ouchida,T Hester,Y Fukao,M Hohlmann,A Denisov,D J Kim,E Kistenev,V Papavassiliou,R Pak,C A Ogilvie,B Azmoun,K Boyle,T Sugitate,Z Yasin,J Zimányi,M Grosse Perdekamp,T Gunji,K O Eyser,S Gadrat,V Singh,A Dion,C R Cleven,E T Atomssa,A Enokizono,A Isupov,I J Choi,C Vale,S Butsyk,G C Mishra,M P Comets,D Winter,Y I Makdisi,V Vrba,W C Smith,I Garishvili,R P Pisani,E M Takagui,V Samsonov,Z Fraenkel,Y Inoue,D Lynch,V Baublis,T E Miller,A Romana,H Borel,B Komkov,S Nagamiya,M Konno,M Slunečka,O Drapier,S K Tuli,H.-Å Gustafsson,M Donadelli,V Babintsev,R Seidl,J Rak,C L Woody,O Jinnouchi,E J Desmond,A Morreale,C Silvestre,H Sakata,W J Park,K Homma,J Ying,J G Lajoie,R S Towell,J Park,Y Tanaka,T K Hemmick,M J Tannenbaum,B Lenzi,N Kurihara,A Shevel,Y.-S Kim,D S Brown,H Tydesjö,E Kinney,C L Silva,K Das,K S Sim,R Hayano,R Hobbs,B Bassalleck,T Liška,H Valle,H Buesching,I Nakagawa,E P Hartouni,C Zhang,D Hornback,M Reuter,D Jouan,M Csanád,A Glenn,H Hiejima,P D Barnes,M Nguyen,K Shigaki,D M Lee,T Kawagishi,H Pereira,N N Ajitanand,M Mishra,K Imai,T Isobe,B Sahlmueller,J M Heuser,P J Kroon,A A Bickley,D P Morrison,D Kawall,D Silvermyr,H Al-Bataineh,A V Kazantsev,C Suire,S H Aronson,A Toia,S S Ryu,V Cianciolo,M Issah,K Dehmelt,M G Hur,X He,K F Read,T C Awes,M Inaba,A Khanzadeev,H En’Yo,Y Le Bornec,M A L Leite,M C Mccain,S Takagi,M Harvey,M Togawa,K Kurita,J Egdemir,P Mikeš,H Hamagaki,A D Frawley,R Granier De Cassagnac,K S Joo,A Kozlov,V Riabov,E Vznuzdaev,J Newby,P Rosnet,A Baldisseri,Y Berdnikov,A K Dubey,Y Cobigo,A K Purwar,S Kelly,H Okada,I D Ojha,K Tanida,W E Sondheim,C Haegemann,S Batsouli,G R Young,P Rukoyatkin,V Semenov,N Tyurin,S Sakai,I Younus,M D Malik,A Yanovich,A Kiyomichi,S N White,Y Riabov,J M Burward-Hoy,F Fleuret,A Bazilevsky,J S Haggerty,H Qu,J Murata,H W Van Hecke,R A Soltz,D Kotchetkov,T Fusayasu,A Drees,A Ster,B Love,S Skutnik,J H Kang,M Wysocki,D E Fields,F Kajihara,M Ishihara,B M Johnson,K Ozawa,K Nakano,F Matathias,H Lim,A Franz,S Leckey,T Horaguchi,T Nakamura,I E Yushmanov,D Sharma,K Reygers,K Okada,R Averbeck,J Velkovska,T Chujo,P Tarján,M J Leitch,E Kim,Y Tsuchimoto,D Yu Peressounko,F Staley,O O Omiwade,H Delagrange,K Shoji,H Gong,K Miki,S F Pate,V Bumazhnov,T Lee,M X Liu,M B Deaton,J L Nagle,J Alexander,M L Brooks,W A Zajc,C Pinkenburg,J L Drachenberg,J Asai,X H Li,E Stenlund,P W Stankus,B V Jacak,M Rosati,S Rembeczki,M L Purschke,N Grau,P L Mcgaughey,K Hasuko,M T Bjorndal,S Campbell,S Zhou,R Lacey,T Tabaru,S Bathe,Y Nagata,T Shohjoh,A Hadj Henni,A Deshpande,K N Barish,N Saito,A Malakhov,K Haruna,J Sziklai,P Chung,J Tojo,R Han,R Bennett,R Seto,M Heffner,J Jin,T Sakaguchi,J T Mitchell,I Shein,V Dzhordzhadze,L Mašek,G Roche,S Esumi,J Imrek,D Pal,J C Hill,M Holmes,I Tserruya,A Churyn,D Mukhopadhyay,M Virius,M Chiu,H Pei,H Masui,T L Thomas,J Jia,Y Mao,I Otterlund,L Tomášek,M Mitrovski,W S Emam,A Soldatov,T Dahms,A Kravitz,A Taranenko,N Willis,O Dietzsch,M Oka,C P Singh,X Li,L Kochenda,I Ravinovich,S Mioduszewski,N Kamihara,D H Kim,E Haslum,Y Watanabe,Y Nakamiya,S Sawada,G Bunce,D Isenhower,D Walker,J P Sullivan,A Litvinenko,G J Kunde,V Peresedov,V Pantuev,L Isenhower,Y Miake,A Al-Jamel,A Lebedev,G David,K Fujiwara,A Durum,G Baksay,M Kaneta,M Gonin,M Stepanov,B Espagnon,F Bauer,A S Nyanin,A Rakotozafindrabe,Y Akiba,Y V Efremenko,L Zolin,B Hong,S Kametani,W Holzmann,T K Shea,J Seele,L Aphecetche,I V Sourikova,G S Kyle,P Constantin,T V Moukhanova,J G Boissevain,M K Lee,S Chernichenko,M Naglis,M Shimomura,J E Frantz,V L Rykov,Y Kwon,D Bucher,J Kubart,M Mccumber,H Torii,F Gastineau,X R Wang,M J Kweon,B Forestier,M Germain,A Taketani,T Hachiya,T Ichihara,A Král,W Xie,S Yokkaichi,V Kochetkov,S Afanasiev,L Baksay,A M Sickles ,Jun Kikuchi ,B Norman ,S Sörensen ,S S.e Rosendahl ,Susumu Sato ,Kazuhiro Tanaka ,Masayuki Hagiwara ,H Sato ,B Cole ,C Y ,C A Aidala ,S Greene ,S Oda ,Y Yamaguchi ,J L Charvet ,S Fokin ,B Chang ,J L Klay ,J S Chai ,H Ohnìshì ,М Фингер ,Y S Lai ,J P Wessels ,T A Shibata ,V N Tram ,A P.t Palounek ,S Y Fung ,A Öskarsson ,Mathias Wagner ,Kazuo Aoki ,T Csörgõ ,Hiroyuki Harada ,J Moss ,C Maguire ,R Vértesi ,Christian Klein-Boesing ,V Manko ,С Беликов ,J Gösset ,Á Kiss ,J C Peng ,А Виноградов ,R Arméndariz ,Hideaki Kano

doi:10.1103/physrevlett.101.232301

Abstract

For Au + Au collisions at 200 GeV, we measure neutral pion production with good statistics for transverse momentum, pT, up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5 < pT < 20 GeV/c. Experimental uncertainties are small enough to constrain any model-dependent parametrization for the transport coefficient of the medium, e.g., q in the parton quenching model. The spectral shape is similar for all collision classes, and the suppression does not saturate in Au + Au collisions.

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