HighpTdirect photon andπ0triggered azimuthal jet correlations and measurement ofkTfor isolated direct photons inp+pcollisions ats=200  GeV

A Adare,R Yang,W E Sondheim,M Stepanov,C R Cleven,Y I Makdisi,T L Thomas,K Kiriluk,K Das,Y Berdnikov,Z Fraenkel,J Seele,M I Nagy,P L Mcgaughey,A Romana,A K Purwar,K Haruna,S Kametani,S Afanasiev,J S Haggerty,S Mioduszewski,T C Awes,V Cianciolo,K Sakashita,J Murata,J Imrek,L Aphecetche,K O Eyser,M B Deaton,M Togawa,C Haegemann,E Vznuzdaev,K Nakano,P Mikeš,M J Kweon,H Delagrange,H Valle,G S Kyle,J G Lajoie,J Ying,Y Watanabe,O Zaudtke,Y Tsuchimoto,O Dietzsch,H Themann,K Boyle,A Durum,A Bazilevsky,N Grau,D E Fields,I Nakagawa,S P Stoll,J Newby,J E Frantz,T Niita,S D Rolnick,W C Chang,T Horaguchi,A A Bickley,W A Zajc,J Sziklai,V Babintsev,C A Ogilvie,A Dion,L Baksay,S Bathe,A Král,M J Tannenbaum,Y Akiba,K Shoji,N Kurihara,D Jouan,B Love,I Younus,A Yanovich,Y Ikeda,M Finger,A Berdnikov,Z Yasin,P Chung,D Kotchetkov,D M Lee,D Walker,Y Onuki,T Kempel,C Pinkenburg,A Franz,R Granier De Cassagnac,I Shein,R S Towell,R Tanabe,C Baumann,G R Young,H Al-Bataineh,L Mašek,I Tserruya,D Layton,K Dehmelt,F Kajihara,S Zhou,F Staley,R Lacey,R A Soltz,L Kochenda,K A Drees,A Kozlov,Y Tanaka,R Pak,M Issah,S H Aronson,G Bunce,V Singh,A Kravitz,G Roche,J L Nagle,D Ivanischev,H Masui,M Rosati,V L Rykov,V Dzhordzhadze,A Lebedev,N N Ajitanand,R Seidl,N Means,F Matathias,S Sawada,F Wei,C L Woody,V Bumazhnov,M J Leitch,A Shevel,S Rembeczki,N Kamihara,Y Morino,K N Barish,E Stenlund,R Ichimiya,A Deshpande,A D Frawley,Y Fukao,D Winter,M Naglis,E M Takagui,S Yokkaichi,M Virius,I J Choi,B Meredith,D Isenhower,A Taketani,A Churyn,D P Morrison,T Tabaru,A Veicht,J Egdemir,C Silvestre,A Drees,E P Hartouni,R K Choudhury,A Taranenko,E J Desmond,M Wysocki,M Konno,W S Emam,M L Brooks,T Liška,D Kawall,K Imai,D Mukhopadhyay,W Holzmann,A Ster,P Liebing,D Lynch,H W Van Hecke,B Komkov,K Tanida,T K Hemmick,I V Sourikova,T Hester,C P Singh,H Gong,K Sedgwick,G Baksay,I Ravinovich,D Hornback,E Kistenev,O Drapier,M A L Leite,G David,I Garishvili,M Chiu,S F Pate,A Isupov,T V Moukhanova,K Kurita,J H Kang,A Toia,J Kubart,K S Sim,A V Kazantsev,A Denisov,Y Nakamiya,J C Hill,P Tarján,T Hachiya,A Enokizono,B Fadem,S Nagamiya,B Azmoun,O O Omiwade,V Peresedov,S Dairaku,H Hiejima,R Bennett,T Engelmore,K M Kijima,S Esumi,K Okada,T Ichihara,M Heffner,E T Atomssa,C Vale,Y Goto,J Chiba,M P Comets,R Seto,B Bassalleck,H Pereira,J G Boissevain,J Asai,M Ouchida,D Roach,M Grosse Perdekamp,J Koster,V Baublis,S Batsouli,S H Kim,A Hadj Henni,H Sakata,P W Stankus,B M Johnson,I E Yushmanov,B Sahlmueller,M Slunečka,S Chernichenko,A Sukhanov,V Papavassiliou,S Butsyk,M Mccumber,M Gonin,Y Riabov,J Zimányi,A Malakhov,R Hobbs,E Kim,M L Purschke,M Donadelli,A M Sickles ,Jun Kikuchi ,A Semenov ,B Norman ,S Sörensen ,S S.e Rosendahl ,Susumu Sato ,Y Yamaguchi ,B Cole ,S White ,C Y ,C A Aidala ,S Greene ,S Oda ,J L Charvet ,S Fokin ,A Basye ,B Chang ,J L Klay ,Yasuhiro Tomita ,C Muñoz Camacho ,H Ohnìshì ,J P Wessels ,T A Shibata ,A Nyanin ,V N Tram ,A P.t Palounek ,A Öskarsson ,B Jacak ,L Tomášlek ,Mathias Wagner ,Kazuo Aoki ,Mei Bai ,T Csörgõ ,Hiroyuki Harada ,C Maguire ,Z H Citron ,Yue Shi Lai ,P Růžička ,Christian Klein-Boesing ,V Manko ,С Беликов ,J Gösset ,J C Peng ,А Виноградов ,R Arméndariz ,Hideaki Kano ,M Inaba,M Ishihara,N Saito,Á Kiss,E Haslum,J Jia,S Campbell,D Silvermyr,A Khanzadeev,T Isobe,H Buesching,A Soldatov,P Rosnet,F Ellinghaus,O Jinnouchi,Y Miake,K Reygers,V Vrba,B Hong,M Shimomura,S Skutnik,J T Mitchell,X R Wang,G J Kunde,T Fusayasu,M Kaneta,L Isenhower,H Borel,J Rak,A Kiyomichi,H En’Yo,K Ozawa,P D Barnes,M Csanád,H Torii,V Pantuev,P Shukla,H Liu,M Kurosawa,F Fleuret,D D’Enterria,Y V Efremenko,K S Joo,M Mishra,R Han,H Hamagaki,A Litvinenko,T Sugitate,M X Liu,S Takagi,J Alexander,Y Mao,W J Park,T Sakaguchi,T Chujo,H Iinuma,S Gadrat,J Tojo,H Pei,K B Lee,C Suire,K Fujiwara,R Hayano,Y Kwon,A Morreale,C L Silva,Y Nagata,X He,M D Malik,M Connors,M Nguyen,B I Kim,K F Read,M Hohlmann,Y Inoue,A K Dubey,B K Singh,T Lee,R Averbeck,C Zhang,D Dutta,R Vértesi,A Rakotozafindrabe,V Riabov,T Gunji,V Kochetkov,M Mitrovski,D J Kim,B Lenzi,M Oka,E Mannel,P Constantin,T Dahms,K Yamaura,A Glenn,D Sharma,W Xie,J Kamin,E O’Brien,J Park,J Jin,S Taneja,R Nouicer,E Kinney,S Sakai,L Zolin,K Shigaki,D Pal,X Li,V Samsonov,A Milov,M Reuter,T Nakamura,K Miki,P Rukoyatkin,V Semenov,A K Mohanty,T Sato,A Baldisseri,H Qu,M K Lee,D H Kim,S Huang,J Velkovska,D Yu Peressounko,J Kapustinsky,H.-Å Gustafsson,T E Miller,K Homma

doi:10.1103/physrevd.82.072001

Abstract

Correlations of charged hadrons of 1 < pT < 10 GeV/c with high pT direct photons and pi^ 0 mesons in the range 5 <pT < 15 GeV/c are used to study jet fragmentation in the photon+jet and di-jet channels, respectively. The magnitude of the partonic transverse momentum, kT, is obtained by comparing to a model incorporating a Gaussian kT smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.

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