Observation of Charge Asymmetry Dependence of Pion Elliptic Flow and the Possible Chiral Magnetic Wave in Heavy-Ion Collisions
ADAMCZYK, L; ADKINS, JK; AGAKISHIEV, G; AGGARWAL, MM; AHAMMED, Z; ALEKSEEV, I; ALFORD, J; APARIN, A; ARKHIPKIN, D; ASCHENAUER, EC; AVERICHEV, GS; BANERJEE, A; BELLWIED, R; BHASIN, A; BHATI, AK; BHATTARAI, P; BIELCIK, J; BIELCIKOVA, J; BLAND, LC; BORDYUZHIN, IG; BOUCHET, J; BRANDIN, AV; BUNZAROV, I; BURTON, TP; BUTTERWORTH, J; CAINES, H; SANCHEZ, MCD; CAMPBELL, JM; CEBRA, D; CERVANTES, MC; CHAKABERIA, I; CHALOUPKA, P; CHANG, Z; CHATTOPADHYAY, S; CHEN, JH; CHEN, X; CHENG, J; CHERNEY, M; CHRISTIE, W; CONTIN, G; CRAWFORD, HJ; DAS, S; DE SILVA, LC; DEBBE, RR; DEDOVICH, TG; DENG, J; DEREVSCHIKOV, AA; DI RUZZA, B; DIDENKO, L; DILKS, C; DONG, X; DRACHENBERG, JL; DRAPER, JE; DU, CM; DUNKELBERGER, LE; DUNLOP, JC; EFIMOV, LG; ENGELAGE, J; EPPLEY, G; ESHA, R; EVDOKIMOV, O; EYSER, O; FATEMI, R; FAZIO, S; FEDERIC, P; FEDORISIN, J; FENG, Z; FILIP, P; FISYAK, Y; FLORES, CE; FULEK, L; GAGLIARDI, CA; GARAND, D; GEURTS, F; GIBSON, A; GIRARD, M; GREINER, L; GROSNICK, D; GUNARATHNE, DS; GUO, Y; GUPTA, S; GUPTA, A; GURYN, W; HAMAD, A; HAMED, A; HAQUE, R; HARRIS, JW; HE, L; HEPPELMANN, S; HEPPELMANN, S; HIRSCH, A; HOFFMANN, GW; HOFMAN, DJ; HORVAT, S; HUANG, HZ; HUANG, B; HUANG, X; HUCK, P; HUMANIC, TJ; IGO, G; JACOBS, WW; JANG, H; JIANG, K; JUDD, EG; KABANA, S; KALINKIN, D; KANG, K; KAUDER, K; KE, HW; KEANE, D; KECHECHYAN, A; KHAN, ZH; KIKOLA, DP; KISEL, I; KISIEL, A; KOETKE, DD; KOLLEGGER, T; KOSARZEWSKI, LK; KOTCHENDA, L; KRAISHAN, AF; KRAVTSOV, P; KRUEGER, K; KULAKOV, I; KUMAR, L; KYCIA, RA; LAMONT, MAC; LANDGRAF, JM; LANDRY, KD; LAURET, J; LEBEDEV; LEDNICKY, R; LEE, JH; LI, W; LI, Y; LI, C; LI, N; LI, ZM; LI, X; LI, X; LISA, MA; LIU, F; LJUBICIC, T; LLOPE, WJ; LOMNITZ, M; LONGACRE, RS; LUO, X; MA, L; MA, R; MA, YG; MA, GL; MAGDY, N; MAJKA, R; MANION, A; MARGETIS, S; MARKERT, C; MASUI, H; MATIS, HS; MCDONALD, D; MEEHAN, K; MINAEV, NG; MIODUSZEWSKI, S; MOHANTY, B; MONDAL, MM; MOROZOV, DA; MUSTAFA, MK; NANDI, BK; NASIM, M; NAYAK, TK; NIGMATKULOV, G; NOGACH, LV; NOH, SY; NOVAK, J; NURUSHEV, SB; ODYNIEC, G; OGAWA, A; OH, K; OKOROKOV, V; OLVITT, DL; PAGE, BS; PAK, R; PAN, YX; PANDIT, Y; PANEBRATSEV, Y; PAWLIK, B; PEI, H; PERKINS, C; PETERSON, A; PILE, P; PLANINIC, M; PLUTA, J; POLJAK, N; PONIATOWSKA, K; PORTER, J; POSIK, M; POSKANZER, AM; PRUTHI, NK; PUTSCHKE, J; QIU, H; QUINTERO, A; RAMACHANDRAN, S; RANIWALA, S; RANIWALA, R; RAY, RL; RITTER, HG; ROBERTS, JB; ROGACHEVSKIY, OV; ROMERO, JL; ROY, A; RUAN, L; RUSNAK, J; RUSNAKOVA, O; SAHOO, NR; SAHU, PK; SAKREJDA, I; SALUR, S; SANDWEISS, J; SARKAR, A; SCHAMBACH, J; SCHARENBERG, RP; SCHMAH, AM; SCHMIDKE, WB; SCHMITZ, N; SEGER, J; SEYBOTH, P; SHAH, N; SHAHALIEV, E; SHANMUGANATHAN, PV; SHAO, M; SHARMA, B; SHARMA, MK; SHEN, WQ; SHI, SS; SHOU, QY; SICHTERMANN, EP; SIKORA, R; SIMKO, M; SKOBY, MJ; SMIRNOV, D; SMIRNOV, N; SONG, L; SORENSEN, P; SPINKA, HM; SRIVASTAVA, B; STANISLAUS, TDS; STEPANOV, M; STOCK, R; STRIKHANOV, M; STRINGFELLOW, B; SUMBERA, M; SUMMA, BJ; SUN, X; SUN, XM; SUN, Z; SUN, Y; SURROW, B; SVIRIDA, DN; SZELEZNIAK, MA; TANG, Z; TANG, AH; TARNOWSKY, T; TAWFIK, AN; THOMAS, JH; TIMMINS, AR; TLUSTY, D; TOKAREV, M; TRENTALANGE, S; TRIBBLE, RE; TRIBEDY, P; TRIPATHY, SK; TRZECIAK, BA; TSAI, OD; ULLRICH, T; UNDERWOOD, DG; UPSAL, I; VAN BUREN, G; VAN NIEUWENHUIZEN, G; VANDENBROUCKE, M; VARMA, R; VASILIEV, AN; VERTESI, R; VIDEBAEK, F; VIYOGI, YP; VOKAL, S; VOLOSHIN, SA; VOSSEN, A; WANG, F; WANG, Y; WANG, H; WANG, JS; WANG, Y; WANG, G; WEBB, G; WEBB, JC; WEN, L; WESTFALL, GD; WIEMAN, H; WISSINK, SW; WITT, R; WU, YF; XIAO, Z; XIE, W; XIN, K; XU, YF; XU, N; XU, Z; XU, QH; XU, H; YANG, Y; YANG, Y; YANG, C; YANG, S; YANG, Q; YE, Z; YEPES, P; YI, L; YIP, K; YOO, IK; YU, N; ZBROSZCZYK, H; ZHA, W; ZHANG, XP; ZHANG, JB; ZHANG, J; ZHANG, Z; ZHANG, S; ZHANG, Y; ZHANG, JL; ZHAO, F; ZHAO, J; ZHONG, C; ZHOU, L; ZHU, X; ZOULKARNEEVA, Y; ZYZAK, M
Date:
2015
Abstract:
We present measurements of pi(-) and pi(+) elliptic flow, v(2), at midrapidity in Au + Au collisions at root s(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 root s(NN) = 27 GeV and higher. At root s(NN) = 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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