Direct photon production in d+Au collisions at sqrt(s_NN)=200 GeV

A Adare,S S Adler, S Afanasiev, C Aidala,N N Ajitanand,Y Akiba,H Albataineh,A Aljamel,J P Alexander, A Angerami,K Aoki,N Apadula, L Aphecetche,Yukihiko Aramaki,R Armendariz,S H Aronson,J Asai,E T Atomssa, R Averbeck, T C Awes,B Azmoun,V Babintsev,Minli Bai,G Baksay,L Baksay, A Baldisseri,K N Barish,P D Barnes,B Bassalleck,Austin Basye,S Bathe,S Batsouli,V Baublis, F Bauer,Christian R Baumann,A Bazilevsky,S Belikov,R Belmont,R Bennett,A Berdnikov,Y Berdnikov,Jihyun Bhom,A A Bickley,M T Bjorndal, D Blau,J G Boissevain,J S Bok,H Borel,K Boyle,M L Brooks,David Brown,N Bruner,D Bucher,H Buesching,V Bumazhnov,G Bunce,J M Burwardhoy,S Butsyk, C M Camacho,X Camard,S Campbell,A Caringi,P Chand,B S Chang,W C Chang,J L Charvet,Ch Chen,S Chernichenko,C Y Chi,J Chiba, M Chiu,I J Choi,Jae Boong Choi, R K Choudhury,P Christiansen, T Chujo,P Chung,A Churyn,O Chvala,V Cianciolo,Zvi Hirsh Citron,Y Cobigo,B A Cole,M P Comets,Z Conesa Del Valle,M Connors,P Constantin,M Csanad, T Csoergo,J P Cussonneau, T Dahms,S Dairaku,I Danchev,K Das, A Datta, G David,M K Dayananda,F Deak,H Delagrange,A Denisov, D Denterria,A Deshpande,E J Desmond,A Devismes,K V Dharmawardane,O Dietzsch,A Dion, M Donadelli,J L Drachenberg,O Drapier,A Drees,K A Drees,A K Dubey,J M Durham,A Durum,Dipanwita Dutta,V Dzhordzhadze,L Dorazio,S Edwards,Y V Efremenko, F Ellinghaus,T Engelmore,A Enokizono,H Enyo,B Espagnon, S Esumi,K O Eyser,B Fadem,D E Fields,C Finck,Michael Finger,F Fleuret,S L Fokin, B D Fox,Z Fraenkel,J E Frantz,A Franz,A D Frawley,Kosaku Fujiwara,Y Fukao,S Y Fung,T Fusayasu,S Gadrat,I Garishvili,M Germain,A Glenn,Haiyan Gong,M Gonin,J Gosset,Y Goto,R Granier De Cassagnac,N Grau,S V Greene,G Grim,M Grosse Perdekamp,T Gunji,Hansake Gustafsson,T Hachiya,A Hadj Henni,J S Haggerty,K I Hahn, H Hamagaki,J Hamblen,Rui Han,J Hanks,A G Hansen,E P Hartouni,K Haruna,M Harvey,E Haslum,K Hasuko, R S Hayano,X He,M Heffner,T K Hemmick,T Hester,J Heuser, P Hidas,H Hiejima, J C Hill,Robert E Hobbs, M Hohlmann,W Holzmann,K Homma,Byungyou Hong,A D Hoover,T Horaguchi, Donald Eric Hornback, Shaohua Huang,T Ichihara,R Ichimiya,H Iinuma,Yasuo Ikeda,V V Ikonnikov,K Imai,J Imrek,M Inaba,D Isenhower,L Isenhower,Masaharu Ishihara,T Isobe,M Issah,A Isupov,D Ivanischev,Yoshitaka Iwanaga,B V Jacak, Jiangyong Jia,Xue Jiang, Jungil Jin, O Jinnouchi,B M Johnson,Sterling C Johnson,T W Jones,K S Joo,D Jouan,D S Jumper,F Kajihara,S Kametani,N Kamihara,J Kamin,M Kaneta, J H Kang, J S Kapustinsky,K Karatsu,Masaharu Kasai,K Katou,Takeo Kawabata,D Kawall,M Kawashima,A V Kazantsev,S Kelly,T Kempel,B Khachaturov,A Khanzadeev,K M Kijima, Aram Kim,B I Kim,D H Kim,Eun Ji Kim,Gi Beom Kim,H J Kim,S H Kim,Y J Kim, E Kinney,K Kiriluk,A Kiss,E Kistenev,A Kiyomichi,J Klay,C Kleinboesing,D Kleinjan,H Kobayashi,L Kochenda,V Kochetkov,R Kohara,B Komkov,M Konno,J Koster,D Kotchetkov, A Kozlov, A Kral,A Kravitz,P J Kroon,C H Kuberg,G J Kunde,K Kurita,Minoru Kuribayashi Kurosawa,M J Kweon,Y Kwon,G S Kyle,R Lacey,Yue Shi Lai,J G Lajoie,D Layton,A A Lebedev,Y Le Bornec,S Leckey, D M Lee,J Lee,Kyong Sei Lee,T Lee,M J Leitch, M A L Leite, B Lenzi,X H Li,P Lichtenwalner,P Liebing,H Lim,L A Linden Levy,T Liska,A Litvinenko,Hui Liu,M X Liu,B Love,David W Lynch, C Maguire,Y I Makdisi,A Malakhov,M D Malik,V I Manko,E Mannel,Y Mao,G Martinez,L Masek,H Masui,F Matathias,Tadashi Matsumoto, M C Mccain,M Mccumber,P L Mcgaughey,D Mcglinchey,N Means,B Meredith, Y Miake,T Mibe, A C Mignerey,P Mikes,Kunio Miki,T E Miller, A Milov,S Mioduszewski,G C Mishra,M Mishra,J T Mitchell, A K Mohanty,Hee Jung Moon,Y Morino,A Morreale,D P Morrison,J Moss,T V Moukhanova,D Mukhopadhyay,M Muniruzzaman,Toshio Murakami,J Murata,S Nagamiya,J L Nagle,M Naglis,M I Nagy,I Nakagawa,Y Nakamiya,K Nakamura,Tomoaki Nakamura,Kazuhiko Nakano

PHYSICAL REVIEW C（2013）

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摘要

Direct photons have been measured in root s(NN) = 200 GeV d + Au collisions at midrapidity. A wide p(T) range is covered by measurements of nearly real virtual photons (1 < p(T) < 6 GeV/c) and real photons (5 < p(T) < 16 GeV/c). The invariant yield of the direct photons in d + Au collisions over the scaled p + p cross section is consistent with unity. Theoretical calculations assuming standard cold-nuclear-matter effects describe the data well for the entire p(T) range. This indicates that the large enhancement of direct photons observed in Au + Au collisions for 1.0 < p(T) < 2.5 GeV/c is attributable to a source other than the initial-state nuclear effects.

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