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Azimuthal di-hadron correlations in d+Au and Au+Au collisions at sqrt{s_(NN)}=200 GeV from STAR

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arxiv 1004.2377 v2 pith:A6ZHTSNN submitted 2010-04-14 nucl-ex

Azimuthal di-hadron correlations in d+Au and Au+Au collisions at sqrt{s_(NN)}=200 GeV from STAR

STAR Collaboration: M.M. Aggarwal , Z. Ahammed , A.V. Alakhverdyants , I. Alekseev , J. Alford , B.D. Anderson , Daniel Anson , D. Arkhipkin
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G.S. Averichev J. Balewski L.S. Barnby S. Baumgart D.R. Beavis R. Bellwied M.J. Betancourt R.R. Betts A. Bhasin A.K. Bhati H. Bichsel J. Bielcik J. Bielcikova B. Biritz L.C. Bland B.E. Bonner J. Bouchet E. Braidot A.V. Brandin A. Bridgeman E. Bruna S. Bueltmann I. Bunzarov T.P. Burton X.Z. Cai H. Caines M. Calderon O. Catu D. Cebra R. Cendejas M.C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H.F. Chen J.H. Chen J.Y. Chen J. Cheng M. Cherney A. Chikanian K.E. Choi W. Christie P. Chung R.F. Clarke M.J.M. Codrington R. Corliss J.G. Cramer H.J. Crawford D. Das S. Dash A. Davila Leyva L.C. De Silva R.R. Debbe T.G. Dedovich A.A. Derevschikov R. Derradi de Souza L. Didenko P. Djawotho S.M. Dogra X. Dong J.L. Drachenberg J.E. Draper J.C. Dunlop M.R. Dutta Mazumdar L.G. Efimov E. Elhalhuli M. Elnimr J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun O. Evdokimov P. Fachini R. Fatemi J. Fedorisin R.G. Fersch P. Filip E. Finch V. Fine Y. Fisyak C.A. Gagliardi D.R. Gangadharan M.S. Ganti E.J. Garcia-Solis A. Geromitsos F. Geurts V. Ghazikhanian P. Ghosh Y.N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick S.M. Guertin A. Gupta N. Gupta W. Guryn B. Haag A. Hamed L-X. Han J.W. Harris J.P. Hays-Wehle M. Heinz S. Heppelmann A. Hirsch E. Hjort A.M. Hoffman G.W. Hoffmann D.J. Hofman B. Huang H.Z. Huang T.J. Humanic L. Huo G. Igo P. Jacobs W.W. Jacobs C. Jena F. Jin C.L. Jones P.G. Jones J. Joseph E.G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan K. Kauder D. Keane A. Kechechyan D. Kettler D.P. Kikola J. Kiryluk A. Kisiel S.R. Klein A.G. Knospe A. Kocoloski D.D. Koetke T. Kollegger J. Konzer I. Koralt L. Koroleva W. Korsch L. Kotchenda V. Kouchpil P. Kravtsov K. Krueger M. Krus L. Kumar P. Kurnadi M.A.C. Lamont J.M. Landgraf S. LaPointe J. Lauret A. Lebedev R. Lednicky C-H. Lee J.H. Lee W. Leight M.J. LeVine C. Li L. Li N. Li W. Li X. Li Y. Li Z.M. Li G. Lin S.J. Lindenbaum M.A. Lisa F. Liu H. Liu J. Liu T. Ljubicic W.J. Llope R.S. Longacre W.A. Love Y. Lu E.V. Lukashov X. Luo G.L. Ma Y.G. Ma D.P. Mahapatra R. Majka O.I. Mall L.K. Mangotra R. Manweiler S. Margetis C. Markert H. Masui H.S. Matis Yu.A. Matulenko D. McDonald T.S. McShane A. Meschanin R. Milner N.G. Minaev S. Mioduszewski A. Mischke M.K. Mitrovski B. Mohanty M.M. Mondal B. Morozov D.A. Morozov M.G. Munhoz B.K. Nandi C. Nattrass T.K. Nayak J.M. Nelson P.K. Netrakanti M.J. Ng L.V. Nogach S.B. Nurushev G. Odyniec A. Ogawa V. Okorokov E.W. Oldag D. Olson M. Pachr B.S. Page S.K. Pal Y. Pandit Y. Panebratsev T. Pawlak T. Peitzmann V. Perevoztchikov C. Perkins W. Peryt S.C. Phatak P. Pile M. Planinic M.A. Ploskon J. Pluta D. Plyku N. Poljak A.M. Poskanzer B.V.K.S. Potukuchi C.B. Powell D. Prindle C. Pruneau N.K. Pruthi P.R. Pujahari J. Putschke H. Qiu R. Raniwala S. Raniwala R.L. Ray R. Redwine R. Reed H.G. Ritter J.B. Roberts O.V. Rogachevskiy J.L. Romero A. Rose C. Roy L. Ruan R. Sahoo S. Sakai I. Sakrejda T. Sakuma S. Salur J. Sandweiss E. Sangaline J. Schambach R.P. Scharenberg N. Schmitz T.R. Schuster J. Seele J. Seger I. Selyuzhenkov P. Seyboth E. Shahaliev M. Shao M. Sharma S.S. Shi E.P. Sichtermann F. Simon R.N. Singaraju M.J. Skoby N. Smirnov P. Sorensen J. Sowinski H.M. Spinka B. Srivastava T.D.S. Stanislaus D. Staszak J.R. Stevens R. Stock M. Strikhanov B. Stringfellow A.A.P. Suaide M.C. Suarez N.L. Subba M. Sumbera X.M. Sun Y. Sun Z. Sun B. Surrow D.N. Svirida T.J.M. Symons A. Szanto De Toledo J. Takahashi A.H. Tang Z. Tang L.H. Tarini T. Tarnowsky D. Thein J.H. Thomas J. Tian A.R. Timmins S. Timoshenko D. Tlusty M. Tokarev T.A. Trainor V.N. Tram S. Trentalange R.E. Tribble O.D. Tsai J. Ulery T. Ullrich D.G. Underwood G. Van Buren M. van Leeuwen G. van Nieuwenhuizen J.A. Vanfossen Jr. R. Varma G.M.S. Vasconcelos A.N. Vasiliev F. Videbaek Y.P. Viyogi S. Vokal S.A. Voloshin M. Wada M. Walker F. Wang G. Wang H. Wang J.S. Wang Q. Wang X.L. Wang Y. Wang G. Webb J.C. Webb G.D. Westfall C. Whitten Jr. H. Wieman S.W. Wissink R. Witt Y.F. Wu W. Xie H. Xu N. Xu Q.H. Xu W. Xu Y. Xu Z. Xu L. Xue Y. Yang P. Yepes K. Yip I-K. Yoo Q. Yue M. Zawisza H. Zbroszczyk W. Zhan J.B. Zhang S. Zhang W.M. Zhang X.P. Zhang Y. Zhang Z.P. Zhang J. Zhao C. Zhong J. Zhou W. Zhou X. Zhu Y.H. Zhu R. Zoulkarneev Y. Zoulkarneeva
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keywords associatedcollisionsaway-sidedphigevcparticleparticlesazimuthal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Yields, correlation shapes, and mean transverse momenta \pt{} of charged particles associated with intermediate to high-\pt{} trigger particles ($2.5 < \pt < 10$ \GeVc) in d+Au and Au+Au collisions at $\snn=200$ GeV are presented. For associated particles at higher $\pt \gtrsim 2.5$ \GeVc, narrow correlation peaks are seen in d+Au and Au+Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle $\pt < 2$ \GeVc, a large enhancement of the near- ($\dphi \sim 0$) and away-side ($\dphi \sim \pi$) associated yields is found, together with a strong broadening of the away-side azimuthal distributions in Au+Au collisions compared to d+Au measurements, suggesting that other particle production mechanisms play a role. This is further supported by the observed significant softening of the away-side associated particle yield distribution at $\dphi \sim \pi$ in central Au+Au collisions.

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