Suppression Pattern Of Neutral Pions At High Transverse Momentum In Au Plus Au Collisions At Root S-Nn=200 Gev And Constraints On Medium Transport Coefficients

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

PHYSICAL REVIEW LETTERS（2008）

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摘要

For Au + Au collisions at 200 GeV, we measure neutral pion production with good statistics for transverse momentum, p(T), up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5 < p(T) < 20 GeV/c. Experimental uncertainties are small enough to constrain any model-dependent parametrization for the transport coefficient of the medium, e. g., <(q) over cap > 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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