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Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions

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arxiv 1504.02175 v2 pith:7NTTIF4U submitted 2015-04-09 nucl-ex nucl-th

Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions

STAR Collaboration: L. Adamczyk , J. K. Adkins , G. Agakishiev , M. M. Aggarwal , Z. Ahammed , I. Alekseev , J. Alford , A. Aparin
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D. Arkhipkin E. C. Aschenauer G. S. Averichev Bairathi A. Banerjee R. Bellwied A. Bhasin A. K. Bhati P. Bhattarai J. Bielcik J. Bielcikova L. C. Bland I. G. Bordyuzhin J. Bouchet A. V. Brandin I. Bunzarov T. P. Burton J. Butterworth H. Caines M. Calder\'on de la Barca S\'anchez J. M. Campbell D. Cebra M. C. Cervantes I. Chakaberia P. Chaloupka Z. Chang S. Chattopadhyay J. H. Chen X. Chen J. Cheng M. Cherney W. Christie G. Contin H. J. Crawford S. Das L. C. De Silva R. R. Debbe T. G. Dedovich J. Deng A. A. Derevschikov B. Di Ruzza L. Didenko C. Dilks X. Dong J. L. Drachenberg J. E. Draper C. M. Du L. E. Dunkelberger J. C. Dunlop L. G. Efimov J. Engelage G. Eppley R. Esha O. Evdokimov O. Eyser R. Fatemi S. Fazio P. Federic J. Fedorisin Z. Feng P. Filip Y. Fisyak C. E. Flores L. Fulek C. A. Gagliardi D. Garand F. Geurts A. Gibson M. Girard L. Greiner D. Grosnick D. S. Gunarathne Y. Guo A. Gupta S. Gupta W. Guryn A. Hamad A. Hamed R. Haque J. W. Harris L. He S. Heppelmann A. Hirsch G. W. Hoffmann D. J. Hofman S. Horvat B. Huang X. Huang H. Z. Huang P. Huck T. J. Humanic G. Igo W. W. Jacobs H. Jang K. Jiang E. G. Judd S. Kabana D. Kalinkin K. Kang K. Kauder H. W. Ke D. Keane A. Kechechyan Z. H. Khan D. P. Kikola I. Kisel A. Kisiel L. Kochenda D. D. Koetke T. Kollegger L. K. Kosarzewski A. F. Kraishan P. Kravtsov K. Krueger I. Kulakov L. Kumar R. A. Kycia M. A. C. Lamont J. M. Landgraf K. D. Landry J. Lauret A. Lebedev R. Lednicky J. H. Lee W. Li Z. M. Li X. Li Y. Li C. Li M. A. Lisa F. Liu T. Ljubicic W. J. Llope M. Lomnitz R. S. Longacre X. Luo Y. G. Ma R. Ma G. L. Ma L. Ma N. Magdy R. Majka A. Manion S. Margetis C. Markert H. Masui H. S. Matis D. McDonald K. Meehan N. G. Minaev S. Mioduszewski D. Mishra B. Mohanty M. M. Mondal D. Morozov M. K. Mustafa B. K. Nandi Md. Nasim T. K. Nayak G. Nigmatkulov L. V. Nogach S. Y. Noh J. Novak S. B. Nurushev G. Odyniec A. Ogawa K. Oh V. Okorokov D. Olvitt Jr. B. S. Page R. Pak Y. X. Pan Y. Pandit Y. Panebratsev B. Pawlik H. Pei C. Perkins A. Peterson P. Pile M. Planinic J. Pluta N. Poljak K. Poniatowska J. Porter M. Posik A. M. Poskanzer N. K. Pruthi J. Putschke H. Qiu A. Quintero S. Ramachandran R. Raniwala S. Raniwala R. L. Ray H. G. Ritter J. B. Roberts O. V. Rogachevskiy J. L. Romero A. Roy L. Ruan J. Rusnak O. Rusnakova N. R. Sahoo P. K. Sahu I. Sakrejda S. Salur J. Sandweiss A. Sarkar J. Schambach R. P. Scharenberg A. M. Schmah W. B. Schmidke N. Schmitz J. Seger P. Seyboth N. Shah E. Shahaliev P. V. Shanmuganathan M. Shao M. K. Sharma B. Sharma W. Q. Shen S. S. Shi Q. Y. Shou E. P. Sichtermann R. Sikora M. Simko M. J. Skoby N. Smirnov D. Smirnov L. Song P. Sorensen H. M. Spinka B. Srivastava T. D. S. Stanislaus M. Stepanov R. Stock M. Strikhanov B. Stringfellow M. Sumbera B. Summa X. Sun X. M. Sun Y. Sun Z. Sun B. Surrow N. Svirida M. A. Szelezniak Z. Tang A. H. Tang T. Tarnowsky A. N. Tawfik J. H. Thomas A. R. Timmins D. Tlusty M. Tokarev S. Trentalange R. E. Tribble P. Tribedy S. K. Tripathy B. A. Trzeciak O. D. Tsai T. Ullrich D. G. Underwood I. Upsal G. Van Buren G. van Nieuwenhuizen M. Vandenbroucke R. Varma A. N. Vasiliev R. Vertesi F. Videb{\ae}k Y. P. Viyogi S. Vokal S. A. Voloshin A. Vossen G. Wang H. Wang J. S. Wang Y. Wang F. Wang G. Webb J. C. Webb L. Wen G. D. Westfall H. Wieman S. W. Wissink R. Witt Y. F. Wu Z. G. Xiao W. Xie K. Xin Q. H. Xu N. Xu H. Xu Z. Xu Y. F. Xu Q. Yang Y. Yang C. Yang S. Yang Z. Ye P. Yepes L. Yi K. Yip I. -K. Yoo N. Yu H. Zbroszczyk W. Zha J. B. Zhang J. Zhang X. P. Zhang Z. Zhang Y. Zhang S. Zhang J. Zhao C. Zhong L. Zhou X. Zhu Y. Zoulkarneeva M. Zyzak
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classification nucl-ex nucl-th
keywords asymmetrycentralitychargedependenceellipticflowsqrtchiral
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We present measurements of $\pi^-$ and $\pi^+$ elliptic flow, $v_2$, at midrapidity in Au+Au collisions at $\sqrt{s_{_{\rm NN}}} =$ 200, 62.4, 39, 27, 19.6, 11.5 and 7.7 GeV, as a function of event-by-event charge asymmetry, $A_{ch}$, based on data from the STAR experiment at RHIC. We find that $\pi^-$ ($\pi^+$) elliptic flow linearly increases (decreases) with charge asymmetry for most centrality bins at $\sqrt{s_{_{\rm NN}}} = \text{27 GeV}$ and higher. At $\sqrt{s_{_{\rm NN}}} = \text{200 GeV}$, the slope of the difference of $v_2$ between $\pi^-$ and $\pi^+$ as a function of $A_{ch}$ exhibits a centrality dependence, which is qualitatively similar to calculations that incorporate a chiral magnetic wave effect. Similar centrality dependence is also observed at lower energies.

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