Direct photon production in p + p collisions at s = 200 GeV at midrapidity

A Z Kiss, E Kistenev,J Klay,C Kleinboesing,L Kochenda,B Komkov,C Vale, Y Tsuchimoto,I Tserruya,Vn Tram,R S Towell,M Ishihara,D Isenhower,M Inaba,J Imrek, M Konno,Jan Koster,A Kozlov, A Kral, B M Johnson,K S Joo,M Wysocki,Koji Imai,Yoshihiko Ikeda,H Iinuma,C L Woody,D Winter,Sebastian White,J P Wessels,Fuwen Wei,Yasuo Watanabe,X R Wang,D Jouan,F Kajihara, S Kametani,A Kravitz,R Ichimiya,T Ichihara, Sanwen Huang, D Hornback,E Vznuzdaev,N Kamihara,J Kamin,H Themann,P Tarjan,T Horaguchi,B Hong,K Homma, V Vrba,K Boyle, M L Brooks,H Buesching,W Holzmann,A Veicht, J Velkovska,R Vertesi, A Vinogradov,M Virius,Yasuyuki Goto,V Bumazhnov,G Bunce,Xiaoyan Li,A Taranenko,M J Tannenbaum,Y I Makdisi, C Maguire,D Lynch, B Love,K Tanida,P Liebing,J S Haggerty,Y Berdnikov,C P Singh,T Liska, A Litvinenko,M Nguyen,J Newby,Kenichi Nakano,Tomoaki Nakamura,J Gosset,M Gonin,Hui Gong,A Glenn,I Garishvili,T Fusayasu,Hongxiang Liu,Y Fukao,K Fujiwara, A Berdnikov,Rachel Bennett,A D Frawley,S Belikov, A K Mohanty,A Malakhov,M D Malik,V I Manko,E Mannel,Y Mao,L Masek, H Masui,Y Morino,A Morreale,D P Morrison,T V Moukhanova,Y Nakamiya,I Nakagawa,Rui Han,A Bazilevsky,C Baumann,V Baublis,E P Hartouni,S Batsouli,S Bathe,Austin Basye,B Bassalleck,P D Barnes,K N Barish, A Baldisseri,L Baksay,G Baksay,M Bai,B K Singh, K S Sim,C Silvestre,D Silvermyr,C L Silva, A Sickles,P Shukla,K Shoji,M Shimomura,K Shigaki,T A Shibata,I Shein,Deepak Sharma, R Seto,V K Semenov,A Yu Semenov,R Seidl,J Seele,K Sedgwick,S Sawada,T Sato,V Samsonov,K Sakashita,S Sakai,T Sakaguchi,Norikazu Saito,B Sahlmueller,V L Rykov, H Hamagaki,V Babintsev,B Azmoun, T C Awes, R Averbeck,E T Atomssa,J Asai,L Aphecetche,Kaoru Aoki,K Haruna,E Haslum,R S Hayano, J P Alexander,A Hadj Henni,H A Gustafsson,T Gunji,Yoshikazu Tanaka,Ryo Tanabe,Xiaoyan He,H Albataineh,Y Akiba,N N Ajitanand,C Aidala, S Afanasiev, A Adare,A Taketani, P Ružicka, P A Rukoyatkin, P Rosnet, S S E Rosendahl,M Rosati,S D Rolnick,A Franz,J E Frantz,Z Fraenkel,M X Liu,M Heffner,T K Hemmick,T Hester,N Grau,R Granier De Cassagnac,T L Thomas,S L Fokin,F Fleuret,D Mukhopadhyay, G Roche,D Roach,Y Riabov,V Riabov,K Reygers,S Rembeczki,K F Read,I Ravinovich,A Rakotozafindrabe,Janusz Rak,Hui Qu,J Murata,M Mishra,J T Mitchell,E M Takagui,M Togawa,A Toia,D Ivanischev,L Tomasek,A Isupov,M Issah, Tomoyasu Isobe,B V Jacak,J Sziklai,A Sukhanov, C Suire,R Yang,A Yanovich,J Ying,S Yokkaichi,G R Young,I Younus,I E Yushmanov, J C Hill, M Hohlmann, M A L Leite,M J Leitch,Taewoo Lee,Kyu Bo Lee,D M Lee, A Lebedev,D Layton,J G Lajoie,W A Zajc,H Borel,J G Boissevain, C A Ogilvie,V Singh,M Slunecka,A A Bickley,M I Nagy,M Naglis,J L Nagle,S Nagamiya,A Soldatov,R A Soltz,S Butsyk, C M Camacho, Scott E Campbell,B Meredith,N Means,P L Mcgaughey,B S Chang,W C Chang, M Finger,D E Fields,B Fadem, K O Eyser, S Esumi, H En Yo,A Enokizono,T Engelmore,F Ellinghaus,Y V Efremenko,J L Charvet,S Chernichenko,C Y Chi, M Chiu,I J Choi, R K Choudhury,S Oda, E O Brien,A S Nyanin,R Nouicer,T Niita,G J Kunde, Kazuyoshi Kurita,Minoru Kuribayashi Kurosawa,M J Kweon, Keiichi Okada,Y Onuki, A Oskarsson,M Ouchida,K Ozawa, R Pak,A P T Palounek,V Pantuev, V Papavassiliou,Jiyoung Park,W J Park,S F Pate,H Pei, J C Peng,H Pereira,Jinping Jia, Y Miake,P Mikes,V Peresedov,V Dzhordzhadze, D Dutta,A Durum,A K Dubey,K A Drees,D Yu Peressounko,C Pinkenburg,Yue Shi Lai,A Drees,O Drapier,M Donadelli,A Dion,M L Purschke,A K Purwar, T Chujo,P Chung, A Churyn,M Mccumber, F Matathias, T Sugitate,V Cianciolo,Zvi Hirsh Citron,R Lacey,G S Kyle,Youngwoo Kwon,B A Cole,P Constantin,M Csanad,T Csorgő, W E Sondheim,T Dahms,S Dairaku,Kinkar Ch Das, G David,S P Stoll,A Ster,S P Sorensen,I V Sourikova,F Staley,Kunio Miki,J Jin,O Dietzsch,E J Desmond,A Deshpande,D D Enterria,A Denisov,O Zaudtke,P W Stankus,L Zolin,Shikun Zhou,Chunlin Zhang,M Stepanov, E Stenlund,S V Greene,M Grosse Perdekamp,B Lenzi,H W Van Hecke,A Milov, Yumiko Tomita, J S Kapustinsky,H Torii,Masanori Oka, J H Kang,K Yamaura, Y Yamaguchi,D Kawall,A V Kazantsev,T Kempel,A Khanzadeev,K M Kijima,J Kikuchi,Byung Ik Kim, D H Kim,E Kim, S H Kim,Wei Xie,H Valle, E Kinney,K Kiriluk

Physical Review D（2012）

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摘要

The differential cross section for the production of direct photons in p + p collisions at root s = 200 GeV at midrapidity was measured in the PHENIX detector at the Relativistic Heavy Ion Collider. Inclusive direct photons were measured in the transverse momentum range from 5: 5-25 GeV/c, extending the range beyond previous measurements. Event structure was studied with an isolation criterion. Next-to-leading-order perturbative-quantum-chromodynamics calculations give a good description of the spectrum. When the cross section is expressed versus x(T), the PHENIX data are seen to be in agreement with measurements from other experiments at different center-of-mass energies.

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