Centrality dependence of low-momentum direct-photon production in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

A Adare,P L Mcgaughey,M Mendoza,Hironobu Iinuma, T Engelmore,A Morreale, Jiutong Sun,J P Wessels,J Ide,T Chujo,R Seidl,F Fleuret,P Chung,M Daugherity,A D Sukhanov,Atsushi Takahara, D C Lynch,H Masui,A Franz,Jaehong Park,E J Kim,K S Sim,A Litvinenko,T Csorgo,Prashant Shukla,E Haslum,Xin Gong,C Aidala,Kaushik Das,S D Rolnick,N A Sparks, Kazuhiko Hashimoto,A Rakotozafindrabe,Sebastian White,T V Moukhanova,A Drees,A Toia,L Guo,Xinjian He, R K Choudhury, Y Miake,Y Miyachi,N Grau,A Veicht, T Dahms,A Milov,B H Park,B V Jacak, F Ellinghaus,L Kochenda,V Pantuev,K Nakamura,V Cianciolo,B Lee, P Castera,M Gonin,M Slunecka,M Finger,D P Morrison,B Bassalleck,J S Haggerty,S Huang,C Gal,C Maguire, J Velkovska,V I Manko,S F Pate,Keiichi Fujiwara,J Seele,Yue Shi Lai,Xiaofen Li,Hideshi Torii,G R Young, J Klatsky,B K Singh,M Nihashi,E Kistenev,Y Riabov,W E Sondheim,H Pereira,A Durum,N Kamihara,K Tanida,M Csanad, A C Mignerey,D Isenhower,Takanori Sakaguchi,C Baumann,D Blau,I Nakagawa, T Sugitate,E T Atomssa,M L Brooks,K Boyle, Tetsuro Tsuji,A Ster, F Krizek,R Yang,V Bumazhnov,P A Rukoyatkin, K Shigaki, B Lenzi,S L Fokin,Samir S Taneja,G Roche,D Kotchetkov,S Nagamiya,J Koster,J Hamblen,L Baksay, Yoji Hori,E Mannel,Y Nakamiya,M X Liu,V Baublis,P Christiansen,S V Greene,S R Lee, J S Kapustinsky,D Yu Peressounko,T Liska,Shinichi Esumi,T Isobe,M Inaba,B Hong,G Baksay, A Manion,J Murata,S Edwards,S Oda,Tomoaki Nakamura, John B Hanks,J Jin, D Dutta,A Kiss,J Newby,Mamoru Ouchida,Jong Bo Choi,R Granier De Cassagnac,D Winter,K Sakashita,D M Reynolds, A Vinogradov,N Apadula,I H Park, K Gainey,M Wysocki, R S Hollis,K Yamaura,S P Tarafdar,K S Lee,J S Bok,I Garishvili,Y Aramaki,T Mibe,L Tomasek,D K Mishra, M Makek,C M Camacho, M A L Leite, S K Park,D Kleinjan,D M Lee,E Vazquezzambrano,M Bai,M Virius,M L Purschke,T Fusayasu,B Fadem,A Yanovich,E Tennant,S Sano,R M Wright,Hailong Pei,S P Stoll,S S E Rosendahl,M J Leitch,J Kamin,D Hornback,A S Nyanin,M J Tannenbaum,T A Shibata,R Bennett,D Mcglinchey,D Ivanishchev,A Kravitz,Masaharu Kasai,K Kurita, J C Hill,A Iordanova,T Gunji,Y Tanaka,P Kline,R S Towell,Jiangyong Jia,Basil S Lewis,Hyung Jin Kim,K B Kim,D K Sharma, E Kinney,A Dion, A Nederlof,R Pak, R Seto,I V Sourikova,Marton Vargyas,B Meredith,T Hachiya,K I Hahn,K Imai,A Denisov,M Grosse Perdekamp,Serguei Afanasiev,Hee Jung Moon, P Rosnet,H A Gustafsson,E Leitner,I Younus, Haijun Liu,C Mckinney,N Means,Kunio Miki,R Luechtenborg,F Kajihara,L Zolin, S P Whitaker,Y K Kim,J Rak,M Proissl,M Shimomura,H W Van Hecke,B Azmoun,R Petti,A Bazilevsky,H Albataineh,O Drapier, G David,M Chiu,D E Fields,P Constantin, A K Mohanty,S Belikov, Viktor Riabov, Ruifang Han,K O Eyser,C P Singh,T K Hemmick,Masaaki Oka,H Gong, A Garishvili,B Love,Zvi Hirsh Citron,C L Woody,C H Chen,S Butsyk,F Matathias,E Richardson,H Altaani,Eugene J Obrien,S Kaneti, A Kozlov,I Ravinovich,J Imrek,C Silvestre,P Liebing,S Zhou, M Soumya,Wenjun Xie,X R Wang,T Todoroki,A Malakhov, M Donadelli,M Tomasek,Austin Basye,K F Read,J E Frantz,O Chvala, R S Hayano,Z Fraenkel,M Kurosawa,G J Kunde,Y Goto,C Vale, M Javani,J G Lajoie,M D Malik,H Enyo,A Kral, M Hohlmann,I E Yushmanov,E M Takagui,X Bing,K Sedgwick,D Jouan,M Nguyen,Zhengrui You,D Kotov,J T Mitchell,E C Aschenauer,R Vertesi,M Heffner,L Patel,T Horaguchi,S Yokkaichi,D Roach, R A Soltz,L Dorazio,Seungmoon Choi, L A Linden Levy,Keiko Homma,A Sickles,Yukio Ikeda,C Nattrass,I J Choi,A V Kazantsev,M Issah,A K Purwar, A Oskarsson, Takeshi Murakami,Dai Watanabe,D Ivanischev, V Papavassiliou, A Angerami,Naoki Saito,Y Berdnikov, E Stenlund,K N Barish,A Vossen,A A Bickley,K Reygers,M Rosati,A D Frawley,H Valle,M Stepanov,M Sarsour, Chengwei Zhang,C Kim,A Zelenski, Y Yamaguchi,A Berdnikov, J P Alexander,Mikio Konno, H Asano,N N Ajitanand, B H Kang,H Buesching,R Ichimiya,G S Kyle,X Jiang,Y Onuki, A Lebedev,K S Joo,P Ruzicka,R Akimoto, S Motschwiller,D Kawall,J P Wood,P W Stankus,Y Tsuchimoto,K Aoki,J Sziklai,Sung Hoon Kim,T L Thomas,S Wolin,A Sen,C Pinkenburg, M Leitgab,K Ozawa,R Tanabe,G Bunce, T C Awes,H Themann,Takao Sato,S H Lim,C Y Chi,E J Desmond,Motoshi Kawashima,J C Peng, D Silvermyr,R Wei,Y Fukao,Koji Nakano,S Bathe,Y I Makdisi,Y Kwon,J Lee,K Kiriluk,V Samsonov,A Taketani,O Dietzsch,W J Park, M Sano,M Ishihara,B Sahlmueller,Liangxin Ding,T Nagae,K Shoji,I Shein, Fangling Wei, S Miyasaka,B A Cole,B Bannier,S Kametani,Kenji Okada,A Yu Semenov,J Ying,T Ichihara,R Nouicer,Y Morino,Y V Efremenko, Shoji Sawada,S Campbell,M Mishra, N Novitzky,T Hester,H Qu,S P Sorensen,B I Kim,Dong Jo Kim,R Belmont,E P Hartouni,T Kempel,M Togawa, S Masumoto,K V Dharmawardane,K M Kijima, R Averbeck,Y Watanabe,A Isupov, Vikram Singh,K Karatsu, V Vrba,W A Zajc,R Lacey,B M Johnson,V Babintsev, I Tserruya,Y Mao,B Komkov,D S Jumper,K A Drees, C A Ogilvie,S Baumgart,A Glenn, H Hamagaki,C L Silva,J M Durham,S Dairaku,Y Akiba,E Vznuzdaev,V Peresedov,I Danchev,M Naglis,Asoke G Datta,P Tarjan,Yasuhiro Komatsu,A Taranenko,Kota Watanabe,J L Nagle,M Mccumber, J H Kang, N Riveli,W Holzmann,P Mikes,A Enokizono,A Deshpande,M Connors,R P Pisani,M I Nagy,Craig A Rosen,A Khanzadeev

PHYSICAL REVIEW C（2015）

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摘要

The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au + Au collisions at root s(NN) = 200 GeV down to pT = 0.4 GeV/c. Photons are detected via photon conversions to e(+)e(-) pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the N-coll-scaled yield measured in p + p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/c in the pT range 0.6-2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with N-part(alpha), where alpha = 1.38 +/- 0.03(stat) +/- 0.07(syst).

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slope,gold,scaling

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