Suppression of Back-to-Back Hadron Pairs at Forward Rapidity ind+AuCollisions atsNN=200  GeV

A Adare,S Nagamiya,S P Stoll,T Engelmore,J Hamblen,R Vértesi,T C Awes,J Kamin,R Han,M Inaba,I Garishvili,M Konno,Y Nakamiya,M Togawa,K I Hahn,R Lacey,M Naglis,T K Hemmick,S Bathe,R Seidl,V Pantuev,A K Mohanty,G Roche,J Velkovska,S Afanasiev,C L Woody,B M Johnson,K Shoji,I J Choi,D Yu Peressounko,G Baksay,I Younus,M Kawashima,K Homma,T Hester,D Ivanischev,M Kurosawa,V Riabov,L Zolin,T L Thomas,R Petti,H Buesching,P Lichtenwalner,N Apadula,C Silvestre,A Lebedev,Y V Efremenko,K Karatsu,T V Moukhanova,B Meredith,A Kravitz,A Litvinenko,W E Sondheim,R Bennett,J Lee,M Rosati,M Chiu,A V Kazantsev,Á Kiss,B Love,E J Kim,W Holzmann,P Christiansen,I Nakagawa,O Dietzsch,Z Fraenkel,Y Berdnikov,H Themann,M Mccumber,M Gonin,M J Leitch,M K Dayananda,D Silvermyr,K N Barish,E O’Brien,J Newby,K Fujiwara,A Toia,J L Nagle,D Winter,H Hamagaki,V Cianciolo,V Bumazhnov,D Roach,C Oakley,A Malakhov,V Babintsev,K Okada,Y I Makdisi,A Yanovich,A Berdnikov,W J Park,M Grosse Perdekamp,R Belmont,K Imai,Y Akiba,H Gong,M Csanád,H Liu,M Ouchida,S Edwards,R Tanabe,X He,V Peresedov,D Isenhower,J Murata,A Angerami,C Baumann,E T Atomssa,E Richardson,O Drapier,K Kurita,T Mibe,D Lynch,B K Singh,E Kistenev,B Azmoun,F Ellinghaus,L Kochenda,K Tanida,N N Ajitanand,I Danchev,J Koster,J S Haggerty,S Campbell,L Baksay,T Horaguchi,G Bunce,T Sakaguchi,R Averbeck,E J Desmond,M Kasai,S Yokkaichi,D Dutta,V Papavassiliou,Y Tanaka,R K Choudhury,T Dahms,R Nouicer,A Dion,M Hohlmann,N Grau,C Vale,T Fusayasu,A Král,Y Tsuchimoto,M Connors,M I Nagy,A Drees,D M Lee,D J Kim,Y Fukao,I Tserruya,S K Park,A Taketani,P L Mcgaughey,J Sziklai,A D Frawley,R M Wright,K Yamaura,I Shein,A Kim,M Shimomura,R Seto,S Dairaku,R Ichimiya,K Das,H En’Yo,I H Park,M Slunečka,T Gunji,R P Pisani,Y Mao,A Veicht,H Valle,R Yang,M J Tannenbaum,T Kempel,B I Kim,T Chujo,M Oka,M Heffner,T Liška,C P Singh,E Mannel,T Nakamura,S Huang,C Pinkenburg,K B Lee,V Baublis,B Hong,M Nihashi,D S Jumper,X Jiang,H Al-Bataineh,S Sawada,K Boyle,K Watanabe,J Ying,J Hanks,P Rukoyatkin,B Fadem,R S Towell,S Butsyk,E Kinney,V Samsonov,K F Read,N Means,A Franz,R Wei,C A Ogilvie,Y Iwanaga,A Deshpande,I E Yushmanov,K Miki,A Sukhanov,D Thomas,S Zhou,B Sahlmueller,E Haslum,Y Aramaki,A Bazilevsky,A C Mignerey,X R Wang,S Taneja,J Jin,A Datta,V Vrba,V Singh,R Pak,S Esumi,P Shukla,G J Kunde,I V Sourikova,M Ishihara,Y Miake,A Khanzadeev,R Hayano,H Masui,H Pei,G David,D Kawall,L Tomášek,Y Goto,M Virius,D Sharma,E Stenlund,A Enokizono,K S Sim,M Issah,A Glenn,M Proissl,M A L Leite,J C Hill,P Liebing,H W Van Hecke,A Durum,Y Ikeda,J H Kang,C L Silva,J Alexander,K Shigaki,P Chung,K Nakano,D Jouan,T Murakami,J E Frantz,J Rak,M Donadelli,J G Lajoie,M D Malik,M Finger,A Caringi,B Komkov,Y Riabov,E Vazquez-Zambrano,W A Zajc,X Li,G Grim,K S Joo,A Taranenko,F Matathias,K M Kijima,S Tarafdar,T Sugitate,C A Rosen,J Seele,S D Rolnick,I Ravinovich,R Granier De Cassagnac,G R Young,Z Conesa Del Valle,Y Watanabe,A Morreale,R A Soltz,J M Durham,G S Kyle,J Jia,K V Dharmawardane,M Nguyen,T Sato,F Kajihara,K A Drees,H J Moon,A Denisov,F Fleuret,B Bassalleck,K Sedgwick,D Hornback,L A Linden Levy,M Wysocki,H Pereira,K Ozawa,E Vznuzdaev,T Ichihara,M X Liu,K Sakashita,N Saito,P W Stankus,H Qu,S F Pate,H Torii,K Reygers,J Kapustinsky,D P Morrison,Y Onuki,M L Purschke,F Wei,A Isupov,J T Mitchell,E M Takagui,D E Fields,Y Morino,A Milov,M L Brooks,H Å Gustafsson ,S Fokin ,A M Sickles ,Y J Kwon ,B Jacak ,T Csörgõ ,Y Yamaguchi ,A Nyanin ,Kazuo Aoki ,T A Shibata ,S Oda ,Jun Kikuchi ,С Сано ,C A Aidala ,P Růžička ,Soren Pontoppidan Sorensen ,C Y ,S S.e Rosendahl ,S White ,B Cole ,Laurent D’orazio ,Mei Bai ,K Nakamura ,A Basye ,Yue Shi Lai ,J P Wessels ,T J Jones ,Z H Citron ,S K Nam ,S Greene ,С Беликов ,C Maguire ,V Manko ,Y J Kim ,D Blau ,J Bhom ,A Öskarsson ,Z Y You ,C H Chen ,J Choi ,O Chvála ,Jeongsu Bok ,J C Peng ,Daisuke Watanabe

doi:10.1103/physrevlett.107.172301

Abstract

Back-to-back hadron pair yields in d+Au and p+p collisions at sNN=200 GeV were measured with the PHENIX detector at the Relativistic Heavy Ion Collider. Rapidity separated hadron pairs were detected with the trigger hadron at pseudorapidity |η|<0.35 and the associated hadron at forward rapidity (deuteron direction, 3.0<η<3.8). Pairs were also detected with both hadrons measured at forward rapidity; in this case, the yield of back-to-back hadron pairs in d+Au collisions with small impact parameters is observed to be suppressed by a factor of 10 relative to p+p collisions. The kinematics of these pairs is expected to probe partons in the Au nucleus with a low fraction x of the nucleon momenta, where the gluon densities rise sharply. The observed suppression as a function of nuclear thickness, pT, and η points to cold nuclear matter effects arising at high parton densities.Received 2 June 2011DOI:https://doi.org/10.1103/PhysRevLett.107.172301© 2011 American Physical Society

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