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Centrality dependence of charged hadron and strange hadron elliptic flow from $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions

B.I. Abelev M.M. Aggarwal Z. Ahammed B.D. Anderson D. Arkhipkin G.S. Averichev Y. Bai J. Balewski O. Barannikova L.S. Barnby J. Baudot 1 S. Baumgart D.R. Beavis R. Bellwied F. Benedosso R.R. Betts S. Bhardwaj A. Bhasin A.K. Bhati H. Bichsel J. Bielcik J. Bielcikova L.C. Bland M. Bombara B.E. Bonner M. Botje E. Braidot A.V. Brandin S. Bueltmann T.P. Burton M. Bystersky X.Z. Cai H. Caines M. Calderon de la Barca Sanchez J. Callner O. Catu D. Cebra 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 S.U. Chung R.F. Clarke M.J.M. Codrington J.P. Coffin 1 T.M. Cormier M.R. Cosentino J.G. Cramer H.J. Crawford D. Das S. Dash M. Daugherity M.M. de Moura T.G. Dedovich M. Dephillips A.A. Derevschikov R. Derradi de Souza L. Didenko T. Dietel P. Djawotho S.M. Dogra X. Dong J.L. Drachenberg J.E. Draper F. Du J.C. Dunlop M.R. Dutta Mazumdar W.R. Edwards L.G. Efimov E. Elhalhuli V. Emelianov J. Engelage G. Eppley B. Erazmus 2 Magali Estienne 1 L. Eun P. Fachini R. Fatemi J. Fedorisin A. Feng P. Filip E. Finch V. Fine Y. Fisyak C.A. Gagliardi L. Gaillard M.S. Ganti E. Garcia-Solis V. Ghazikhanian P. Ghosh Y.N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S.M. Guertin Anupam Gupta N. Gupta W. Guryn B. Haag T.J. Hallman A. Hamed J.W. Harris W. He M. Heinz S. Heppelmann B. Hippolyte 1 A. Hirsch A.M. Hoffman G.W. Hoffmann D.J. Hofman R.S. Hollis H.Z. Huang E.W. Hughes T.J. Humanic G. Igo A. Iordanova P. Jacobs W.W. Jacobs P. Jakl F. Jin P.G. Jones E.G. Judd S. Kabana 2 K. Kajimoto K. Kang J. Kapitan M. Kaplan D. Keane A. Kechechyan D. Kettler V.Yu. Khodyrev J. Kiryluk A. Kisiel S.R. Klein A.G. Knospe A. Kocoloski D.D. Koetke T. Kollegger M. Kopytine L. Kotchenda V. Kouchpil P. Kravtsov V.I. Kravtsov K. Krueger C. Kuhn 1 A. Kumar L. Kumar P. Kurnadi M.A.C. Lamont J.M. Landgraf S. Lange S. Lapointe F. Laue J. Lauret A. Lebedev R. Lednicky C.-H. Lee M.J. Levine C. Li Y. Li G. Lin X. Lin S.J. Lindenbaum M.A. Lisa F. Liu Hong Liu J. Liu L. Liu T. Ljubicic W.J. Llope R.S. Longacre W.A. Love Y. Lu T. Ludlam D. Lynn G.L. Ma J.G. Ma Y.G. Ma D.P. Mahapatra R. Majka L.K. Mangotra R. Manweiler S. Margetis C. Markert H.S. Matis Yu.A. Matulenko T.S. Mcshane A. Meschanin J. Millane M.L. Miller N.G. Minaev S. Mioduszewski A. Mischke J. Mitchell B. Mohanty D.A. Morozov M.G. Munhoz B.K. Nandi C. Nattrass T.K. Nayak J.M. Nelson C. Nepali P.K. Netrakanti M.J. Ng L.V. Nogach S.B. Nurushev G. Odyniec A. Ogawa H. Okada V. Okorokov M. Oldenberg D. Olson M. Pachr S.K. Pal Y. Panebratsev T. Pawlak T. Peitzmann V. Perevoztchikov C. Perkins W. Peryt S.C. Phatak M. Planinic J. Pluta N. Poljak N. Porile A.M. Poskanzer M. Potekhin B.V.K.S. Potukuchi D. Prindle C. Pruneau N.K. Pruthi J. Putschke I.A. Qattan R. Raniwala S. Raniwala R.L. Ray D. Relyea A. Ridiger H.G. Ritter J.B. Roberts O.V. Rogachevskiy J.L. Romero A. Rose C. Roy 2 L. Ruan M.J. Russcher V. Rykov R. Sahoo 2 I. Sakrejda T. Sakuma S. Salur J. Sandweiss M. Sarsour J. Schambach R.P. Scharenberg N. Schmitz K. Schwada J. Seger I. Selyuzhenkov P. Seyboth Alexandre Shabetai 1 E. Shahaliev M. Shao M. Sharma S.S. Shi X.-H. Shi E.P. Sichtermann F. Simon R.N. Singaraju M.J. Skoby N. Smirnov R. Snellings P. Sorensen J. Sowinski H.M. Spinka B. Srivastava A. Stadnik T.D.S. Stanislaus D. Staszak R. Stock M. Strikhanov B. Stringfellow A.A.P. Suaide M.C. Suarez N.L. Subba M. Sumbera X.M. Sun Z. Sun B. Surrow T.J.M. Symons A. Szanto De J. Takahashi A.H. Tang Z. Tang T. Tarnowsky D. Thein J.H. Thomas J. Tian A.R. Timmins S. Timoshenko M. Tokarev V.N. Tram A.L. Trattner S. Trentalange R.E. Tribble O.D. Tsai J. Ulery T. Ullrich D.G. Underwood G. van Buren N. van der Kolk M. van Leeuwen A.M. Vander Molen R. Varma G.M.S. Vasconcelos I.M. Vasilevski A.N. Vasiliev F. Videbaek S.E. Vigdor Y.P. Viyogi S. Vokal S.A. Voloshin M. Wada W.T. Waggoner F. Wang G. Wang J.S. Wang Q. Wang X. Wang X.L. Wang Y. Wang J.C. Webb G.D. Westfall C. Whitten H. Wieman S.W. Wissink R. Witt J. Wu Y. Wu N. Xu Q.H. Xu Z. Xu P. Yepes I.-K. Yoo Q. Yue M. Zawisza H. Zbroszczyk W. Zhan H. Zhang S. Zhang W.M. Zhang Y. Zhang Z.P. Zhang Y. Zhao C. Zhong J. Zhou R. Zoulkarneev Y. Zoulkarneeva J.X. Zuo
Abstract : We present STAR results on the elliptic flow v_2 of charged hadrons, strange and multi-strange particles from sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC. The detailed study of the centrality dependence of v_2 over a broad transverse momentum range is presented. Comparison of different analysis methods are made in order to estimate systematic uncertainties. In order to discuss the non-flow effect, we have performed the first analysis of v_2 with the Lee-Yang Zero method for K_s^0 and Lambda. In the relatively low p_T region, p_T <= 2 GeV/c, a scaling with m_T - m is observed for identified hadrons in each centrality bin studied. We do not observe v_2(p_T) scaled by the participant eccentricity to be independent of centrality. At higher p_T, 2 GeV/c <= p_T <= 6 GeV/c, v_2 scales with quark number for all hadrons studied. For the multi-strange hadron Omega, which does not suffer appreciable hadronic interactions, the values of v_2 are consistent with both m_T - m scaling at low p_T and number-of-quark scaling at intermediate p_T. As a function of collision centrality, an increase of p_T-integrated v_2 scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.
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Submitted on : Monday, January 28, 2008 - 2:00:40 PM
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B.I. Abelev, M.M. Aggarwal, Z. Ahammed, B.D. Anderson, D. Arkhipkin, et al.. Centrality dependence of charged hadron and strange hadron elliptic flow from $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions. Physical Review C, American Physical Society, 2008, 77, pp.054901. ⟨10.1103/PhysRevC.77.054901⟩. ⟨in2p3-00221135⟩

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