Azimuthal anisotropy in Cu+Au collisions at sqrt{s_{_{NN}}} = 200 GeV

STAR Collaboration: L. Adamczyk , J. R. Adams , J. K. Adkins , G. Agakishiev , M. M. Aggarwal , Z. Ahammed , N. N. Ajitanand , I. Alekseev

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D. M. Anderson R. Aoyama A. Aparin D. Arkhipkin E. C. Aschenauer M. U. Ashraf A. Attri G. S. Averichev X. Bai V. Bairathi K. Barish A. Behera R. Bellwied A. Bhasin A. K. Bhati P. Bhattarai J. Bielcik J. Bielcikova L. C. Bland I. G. Bordyuzhin J. Bouchet J. D. Brandenburg A. V. Brandin D. Brown J. Bryslawskyj I. Bunzarov J. Butterworth H. Caines M. Calder\'on de la Barca S\'anchez J. M. Campbell D. Cebra I. Chakaberia P. Chaloupka Z. Chang N. Chankova-Bunzarova A. Chatterjee S. Chattopadhyay X. Chen J. H. Chen J. Cheng M. Cherney W. Christie G. Contin H. J. Crawford S. Das T. G. Dedovich J. Deng I. M. Deppner A. A. Derevschikov L. Didenko C. Dilks X. Dong J. L. Drachenberg J. E. Draper J. C. Dunlop L. G. Efimov N. Elsey J. Engelage G. Eppley R. Esha S. Esumi O. Evdokimov J. Ewigleben O. Eyser R. Fatemi S. Fazio P. Federic P. Federicova J. Fedorisin Z. Feng P. Filip E. Finch Y. Fisyak C. E. Flores J. Fujita L. Fulek C. A. Gagliardi F. Geurts A. Gibson M. Girard D. Grosnick D. S. Gunarathne Y. Guo A. Gupta W. Guryn A. I. Hamad A. Hamed A. Harlenderova J. W. Harris L. He S. Heppelmann N. Herrmann A. Hirsch S. Horvat X. Huang H. Z. Huang T. Huang B. Huang T. J. Humanic P. Huo G. Igo W. W. Jacobs A. Jentsch J. Jia K. Jiang S. Jowzaee E. G. Judd S. Kabana D. Kalinkin K. Kang D. Kapukchyan K. Kauder H. W. Ke D. Keane A. Kechechyan Z. Khan D. P. Kiko{\l}a C. Kim I. Kisel A. Kisiel L. Kochenda M. Kocmanek T. Kollegger L. K. Kosarzewski A. F. Kraishan L. Krauth P. Kravtsov K. Krueger N. Kulathunga L. Kumar J. Kvapil J. H. Kwasizur R. Lacey J. M. Landgraf K. D. Landry J. Lauret A. Lebedev R. Lednicky J. H. Lee W. Li C. Li X. Li Y. Li J. Lidrych T. Lin M. A. Lisa F. Liu P. Liu Y. Liu H. Liu T. Ljubicic W. J. Llope M. Lomnitz R. S. Longacre S. Luo X. Luo G. L. Ma R. Ma Y. G. Ma L. Ma N. Magdy R. Majka D. Mallick S. Margetis C. Markert H. S. Matis D. Mayes K. Meehan J. C. Mei Z. W. Miller N. G. Minaev S. Mioduszewski D. Mishra S. Mizuno B. Mohanty M. M. Mondal D. A. Morozov M. K. Mustafa Md. Nasim T. K. Nayak J. M. Nelson D. B. Nemes M. Nie G. Nigmatkulov T. Niida L. V. Nogach T. Nonaka S. B. Nurushev G. Odyniec A. Ogawa K. Oh V. A. Okorokov D. Olvitt Jr. B. S. Page R. Pak Y. Pandit Y. Panebratsev B. Pawlik H. Pei C. Perkins J. Pluta K. Poniatowska J. Porter M. Posik A. M. Poskanzer N. K. Pruthi M. Przybycien J. Putschke A. Quintero S. Ramachandran R. L. Ray R. Reed M. J. Rehbein H. G. Ritter J. B. Roberts O. V. Rogachevskiy J. L. Romero J. D. Roth L. Ruan J. Rusnak O. Rusnakova N. R. Sahoo P. K. Sahu S. Salur J. Sandweiss M. Saur J. Schambach A. M. Schmah W. B. Schmidke N. Schmitz B. R. Schweid J. Seger M. Sergeeva R. Seto P. Seyboth N. Shah E. Shahaliev P. V. Shanmuganathan M. Shao W. Q. Shen S. S. Shi Z. Shi Q. Y. Shou E. P. Sichtermann R. Sikora M. Simko S. Singha M. J. Skoby N. Smirnov D. Smirnov W. Solyst P. Sorensen H. M. Spinka B. Srivastava T. D. S. Stanislaus D. J. Stewart M. Strikhanov B. Stringfellow A. A. P. Suaide T. Sugiura M. Sumbera B. Summa X. Sun Y. Sun X. M. Sun B. Surrow D. N. Svirida Z. Tang A. H. Tang A. Taranenko T. Tarnowsky A. Tawfik J. Th\"ader J. H. Thomas A. R. Timmins D. Tlusty T. Todoroki M. Tokarev S. Trentalange R. E. Tribble P. Tribedy S. K. Tripathy B. A. Trzeciak O. D. Tsai B. Tu T. Ullrich D. G. Underwood I. Upsal G. Van Buren G. van Nieuwenhuizen A. N. Vasiliev F. Videb{\ae}k S. Vokal S. A. Voloshin A. Vossen G. Wang F. Wang Y. Wang G. Webb J. C. Webb L. Wen G. D. Westfall H. Wieman S. W. Wissink R. Witt Y. Wu Z. G. Xiao G. Xie W. Xie Q. H. Xu Y. F. Xu J. Xu N. Xu Z. Xu C. Yang S. Yang Q. Yang Y. Yang Z. Ye L. Yi K. Yip I. -K. Yoo N. Yu H. Zbroszczyk W. Zha J. B. Zhang J. Zhang S. Zhang L. Zhang X. P. Zhang Z. Zhang Y. Zhang J. Zhao C. Zhong C. Zhou L. Zhou X. Zhu Z. Zhu M. Zyzak

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keywords collisionsflowdirectedsqrtobservedsimilarazimuthalcharged

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The azimuthal anisotropic flow of identified and unidentified charged particles has been systematically studied in Cu+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV for harmonics $n=$ 1-4 in the pseudorapidity range $|\eta|<1$. The directed flow in Cu+Au collisions is compared with the rapidity-odd and, for the first time, the rapidity-even components of charged particle directed flow in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200~GeV. The slope of the directed flow pseudorapidity dependence in Cu+Au collisions is found to be similar to that in Au+Au collisions, with the intercept shifted toward positive $\eta$ values, i.e., the Cu-going direction. The mean transverse momentum projected onto the spectator plane, $\langle p_x\rangle$, in Cu+Au collision also exhibits approximately linear dependence on $\eta$ with the intercept at about $\eta\approx-0.4$, closer to the rapidity of the Cu+Au system center-of-mass. The observed dependencies find natural explanation in a picture of the directed flow originating partly due the "tilted source" and partly due to the rapidity dependent asymmetry in the initial density distribution. Charge-dependence of the $\langle p_x\rangle$ was also observed in Cu+Au collisions, indicating an effect of the initial electric field created by charge difference of the spectator protons in two colliding nuclei. The rapidity-even component of directed flow in Au+Au collisions is close to that in Pb+Pb collisions at $\sqrt{s_{_{NN}}}$ = 2.76 TeV, indicating a similar magnitude of dipole-like fluctuations in the initial-state density distribution. Higher harmonic flow in Cu+Au collisions exhibits similar trends to those observed in Au+Au and Pb+Pb collisions and is qualitatively reproduced by a viscous hydrodynamic model and a multi-phase transport model. For all harmonics with $n\ge2$ we observe an approximate scaling of $v_n$ with the number of constituent quarks.

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