Centrality dependence of low-momentum direct-photon production in Au plus Au collisions at root s(NN)=200 GeV

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

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 sNN−−−√=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 Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240MeV/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 Nαpart, where α=1.38±0.03(stat)±0.07(syst).

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