Medium Modification of Jet Fragmentation inAu+AuCollisions atsNN=200  GeVMeasured in Direct Photon-Hadron Correlations

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Bathe,M Grosse Perdekamp,C Vale,V Bumazhnov,I Tserruya,S H Lee,W A Zajc,P Castera,I Ravinovich,T C Awes,R S Hollis,M Soumya,J Seele,K Boyle,M P Comets,B Bannier,T K Hemmick,W C Chang,E C Aschenauer,J L Nagle,V Papavassiliou,K Sedgwick,M Sano,A Taketani,W Holzmann,S P Stoll,J Imrek,M Mccumber,A Toia,J Egdemir,M Virius,I Shein,A Shevel,Y Hori,J Chiba,A Sukhanov,A Durum,W E Sondheim,R P Pisani,N Apadula,A Franz,S Kametani,K Imai,K Karatsu,J Hanks,M J Tannenbaum,P Chung,D Roach,A Kravitz,E Richardson,O Dietzsch,M Mishra,C Pinkenburg,A Bazilevsky,M Nihashi,E J Desmond,Z Yasin,M J Kweon,O Zaudtke,N N Ajitanand,Y Goto,B Sahlmueller,L Aphecetche,A Kozlov,D M Lee,E Tennant,M Ouchida,S D Rolnick,A D Frawley,I Nakagawa,T Todoroki,P L Mcgaughey,N Kamihara,I Danchev,C Mckinney,L Tomášek,T L Thomas,T Horaguchi,X Bing,S Rembeczki,S Tarafdar,T Ichihara,J Zimányi,R Belmont,H Masui,D Jouan,S Afanasiev,K O Eyser,M Togawa,Z Fraenkel,S Butsyk,M Proissl,V Cianciolo,M Naglis,R S Towell,A Isupov,D Lynch,J H Kang,M Leitgab,A K Purwar,Y Tanaka,M A L Leite,D Kotov,M Issah,R Lacey,P Mikeš,R Pak,T Liška,B Meredith,D Kleinjan,N Kurihara,C Haegemann,T Tabaru,J G Lajoie,C R Cleven,M Wysocki,C L Woody,S Nagamiya,C Silvestre,H Themann,K S Sim,A Taranenko,G S Kyle,G David,K N Barish,M Mendoza,F Matathias,S Batsouli,R Granier De Cassagnac,Y Riabov,Y Tsuchimoto,J Koster,S Mioduszewski,M Kasai,O O Omiwade,Y Morino,D Walker,V Peresedov,T Niida,C A Ogilvie,A Garishvili,R A Soltz,N Novitzky,M I Nagy,P Kline,A Berdnikov,J Ying,M Chiu,M J Leitch,J S Haggerty,C Gal,J Ide,S Zhou,A Enokizono,S H Aronson,E Vznuzdaev,K Okada,T Kempel,A Romana,E Stenlund,K S Lee,S Chernichenko,D K Mishra,H Gong,A Drees,S Wolin,A Veicht,E Kistenev,A Denisov,D P Morrison,K V Dharmawardane,S Yokkaichi,A V Kazantsev,R Petti,M Sarsour,B Komkov,D Mukhopadhyay,G Bunce,M Stepanov,A A Bickley,B Love,H W Van Hecke,V Baublis,V Dzhordzhadze,S Esumi,J Kubart,Y Watanabe,D Kawall,D S Jumper,J Newby,Y Onuki,Y I Makdisi,K A Drees,G Baksay,N Grau,S Motschwiller,J C Hill,Y Akiba,H Sakata,E P Hartouni,A Iordanova,M L Brooks,M Slunečka,D Isenhower,A Král,P Liebing,M Rosati,M Gonin,V L Rykov,L Mašek,M Tomášek,Mathias Wagner ,C Kim,Christian Klein-Boesing ,V Kochetkov,M Vargyas,P D Barnes,E O’Brien,J Wood ,H.-Å Gustafsson,F Fleuret,J Tojo,T Sakaguchi,R Nouicer,C Zhang,B Jacak ,J M Durham,S Fokin ,Susumu Sato ,Jeongsu Bok ,T Nakamura,M Makek,T Nagae,D Sharma,J Gösset ,I H Park,M Kurosawa,J Kamin,A Rakotozafindrabe,O Chvála ,P Růžička ,K Fujiwara,D Yu Peressounko,Kazuo Aoki ,D Silvermyr,S S.e Rosendahl ,B Lewis,E Kinney,Yasuhiro Tomita ,J Lee,Hiroyuki Harada ,D D’Enterria,R Akimoto,S Gadrat,F Křížek ,T Mibe,A Basye ,J Park,M Csanád,T Dahms,A Khanzadeev,Y Mao,Y Miyachi,S R Lee,A Baldisseri,P Rosnet,K Reygers,H En’Yo,B Cole ,M K Lee,V Pantuev,A Malakhov,V N Tram ,C Nattrass,Richard Reynolds ,T Gunji,C A Rosen,A K Dubey,B Norman ,W Xie,K Hashimoto,J L Klay ,T Chujo,K B Lee,G J Kunde,R Han,M Nguyen,M Mitrovski,H Hamagaki,Y S Lai,B I 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Shimomura,A K Mohanty,C Muñoz Camacho ,V Riabov,W J Park,M Kawashima,K Nakamura ,Y.-J Kim,J Alexander,S Takagi,M D Malik,H Pei,С Сано ,E Kim,Y Yamaguchi ,B K Singh,T Tsuji,R Vértesi,A Glenn,J P Wessels ,J Kapustinsky,S Miyasaka,М Фингер ,D Pal,X He,M X Liu,H Ohnìshì ,B H Park,Y Kwon,A Litvinenko,P Shukla,Á Kiss,O Jinnouchi,K Shigaki,M Oka,J Jia,K F Read,H Al-Ta’Ani,V Samsonov,S Oda ,E Mannel,K Ozawa,M Ishihara,А Виноградов ,A Nyanin ,D J Kim,P Constantin,Y V Efremenko,T A Shibata ,K Lee,A Zelenski,Mei Bai ,H Asano,D Mcglinchey,M Connors,B Lenzi,T Lee,M Reuter,X Jiang,T Csörgõ ,H Torii,L Isenhower,A Soldatov,Z Y You ,T Fusayasu,J Jin,V Vrba,P Christiansen,H Liu,S K Park,J C Peng ,B Lee

doi:10.1103/physrevlett.111.032301

Abstract

The jet fragmentation function is measured with direct photon-hadron correlations in p+p and Au+Au collisions at √[s(NN)]=200 GeV. The p(T) of the photon is an excellent approximation to the initial p(T) of the jet and the ratio z(T)=p(T)(h)/p(T)(γ) is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au+Au collisions while a photon isolation cut is applied in p+p. I(AA), the ratio of hadron yield opposite the photon in Au+Au to that in p+p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high z(T). The associated hadron yield at low z(T) is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.

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