Direct Observation of Dijets in CentralAu+AuCollisions atsNN=200  GeV

J R Adams ,M Oldenburg,B Hippolyte,J M Landgraf,H Zhang,P Djawotho,J Sandweiss,M J Horner,B K Nandi,J E Gonzalez,T Peitzmann,M Swanger,W W Jacobs,D Relyea,Y Zhang,G Sood,M A Lisa,Q H Xu,J H Chen,S K Pal,T Ludlam,G Odyniec,E G Judd,V I Kravtsov,T S Mcshane,H Jiang,G Wang,A Lebedev,S C Phatak,G Lin,K Kang,S B Nurushev,B Stringfellow,M Pachr,A Tai,D Lynn,M Estienne,R Majka,N Gupta,A Stadnik,T J Humanic,A Chikanian,T Tarnowsky,M Strikhanov,H S Matis,W J Llope,G W Hoffmann,S Lange,J Putschke,V Eckardt,Yu A Matulenko,M M De Moura,A Bellingeri-Laurikainen,S Raniwala,D Keane,V Perevoztchikov,Y Guo,C A Gagliardi,S M Guertin,S A Voloshin,L K Mangotra,X Dong,J Engelage,J E Draper,Z Liu,J Kiryluk,F Du,Z Xu,R Raniwala,S Salur,P K Netrakanti,S Mioduszewski,Y Lu,X L Wang,C O Blyth,P Yepes,J H Thomas,I Sakrejda,C Markert,E Shahaliev,H Bichsel,J Pluta,B D Anderson,C Mironov,P Chaloupka,N Smirnov,M R Cosentino,R V Cadman,M Kaplan,K Krueger,J Cheng,R Varma,R Sahoo,A Ridiger,S Margetis,A K Bhati,A I Pavlinov,W M Zhang,A Kechechyan,F Simon,Z Sun,Y G Gorbunov,D Cebra,Y Fisyak,A Shabetai,E Potrebenikova,A H Tang,P Jacobs,W R Edwards,C J Mcclain,G Rakness,R S Longacre,M Kopytine,B C Kim,K Schweda,M Anderson,Q Li,W A Love,A M Poskanzer,S W Wissink,M Daugherity,M J Levine,O V Rogachevskiy,S Das,P Seyboth,G Igo,M Botje,M R Dutta Mazumdar,W He,W Q Shen,G D Westfall,P G Jones,B I Bezverkhny,R E Tribble,J Bouchet,H Z Huang,R Picha,N Poljak,J W Watson,S V Razin,H A Choi,N Van Der Kolk,A Wetzler,Z P Zhang,H Caines,G Eppley,J C Webb,S J Lindenbaum,C Roy,J W Harris,T W Henry,V Okorokov,Y Panebratsev,R Zoulkarneev,D G Underwood,A M Vander Molen,D D Koetke,A Rose,W Christie,S S Shimanskiy,T D Gutierrez,L V Nogach,D Prindle,J G Cramer,V Ghazikhanian,J Takahashi,L Gaillard,K Filimonov,B E Bonner,D Das,M Sarsour,A A Derevschikov,J C Dunlop,O Catu,R Stock,V Kouchpil,N G Minaev,J Wu,M G Munhoz,J L Romero,J Schambach,J Porter,D Grosnick,R Fatemi,I Selyuzhenkov,M Heinz,E Finch,G S Averichev,T Ullrich,R Vernet,S Hepplemann,J Baudot,B Surrow,C F Moore,D Olson,E Sugarbaker,L Ruan,D Magestro,T D S Stanislaus,J Wood,A Bravar,W T Waggoner,S Lapointe,J Reinnarth,M S Ganti,M Cherney,L Liu,A Hirsch,M Lopez-Noriega,J Seger,A R Timmins,Y Wang,J S Wang,Y Zhao,A Stolpovsky,R L Ray,N Schmitz,H J Crawford,E M Kislov,T Dietel,T K Nayak,T M Cormier,S Timoshenko,A Mischke,T Pawlak,D P Mahapatra,H Gos,H Wieman,W Peryt,J Lauret,C Pruneau,G Van Buren,T J Hallman,L Didenko,S Bekele,V I Yurevich,S Kabana,Z Ahammed,M Dephillips,P Filip,F Liu,B Erazmus,P Ghosh,A Meschanin,J Gans,P Jakl,M Van Leeuwen,F Laue,P Sorensen,A Ogawa,L G Efimov,A Bhasin,V Fine,M J Russcher,J P Coffin,S Trentalange,W J Dong,N Porile,C Nattrass,M Shao,V V Belaga,R Manweiler,C Whitten,X Z Cai,R Witt,H Long,P Fachini,I M Vasilevski,H G Ritter,H Liu,S Bhardwaj,H F Chen,A N Zubarev,Y Bai,V B Dunin,R P Scharenberg,M Calderón De La Barca Sánchez,F Wang,O D Tsai,Y Zoulkarneeva,T J M Symons,Y P Viyogi,J Balewski,D Thein,Y Chen,A Kisiel,J Kapitan,L S Barnby,N Xu,S Chattopadhyay,A V Brandin,R Bellwied,Y Li,M Potekhin,L C Bland,C Kuhn,J Castillo,T G Dedovich,C Li,J Liu,B Srivastava,J X Zuo,B Haag,E W Hughes,B Mohanty,M M Aggarwal,J Amonett,J Ulery,W Zhan,A Szanto De Toledo,M Sharma,S R Klein,A Hamed,P S Sazhin,M Tokarev,D Arkhipkin,C Perkins,L Kotchenda,O Barannikova,J M Nelson,E Hjort,J Speltz,T Kollegger,M A.c Lamont ,M Šumbera ,M Krämer ,M Bysterský ,Jiang Fu ,G L ,C H Lee ,J Fedorišin ,J Sowiński ,B Potukuchi ,П Кравцов ,J Bielčík ,А А Кузнецов ,В А Никитин ,Д А Морозов ,S Vokál ,Zhong Chen ,Alexandre Alarcon Do Passo Suaide ,S Lehocká ,Fei Jia ,А И Куликов ,Yu Melnick ,Michael L Miller ,Z Chajęcki ,L M Garcia Martin ,J Roberts ,R Singaraju ,A Vasiliev ,H Spinka ,J T Mitchell ,L Molnár ,J G ,T Ljubičić ,D Mishra ,Ajay Kumar ,S Panitkin ,M Planinić ,В А Петров ,Y G ,S Dogra ,J Bielčíková ,В Емелянов ,K S.f.f Guimaraes ,K Kowalik ,S Huang ,I K Yoo ,Raimond Snellings ,V Yu Khodyrev ,S Blyth ,S.e Vigdor ,R Lednický ,O G Grebenyuk ,F Retière ,E P Sichtermann

doi:10.1103/physrevlett.97.162301

Abstract

The STAR Collaboration at the Relativistic Heavy Ion Collider reports measurements of azimuthal correlations of high transverse momentum (pT) charged hadrons in Au+Au collisions at higher pT than reported previously. As (pT) is increased, a narrow, back-to-back peak emerges above the decreasing background, providing a clear dijet signal for all collision centralities studied. Using these correlations, we perform a systematic study of dijet production and suppression in nuclear collisions, providing new constraints on the mechanisms underlying partonic energy loss in dense matter.

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