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J. Skoby, M. K. Mustafa, M. K. Sharma, M. Lomnitz, M. M. Aggarwal, M. M. Mondal, M. Posik, M. Przybycien, M. Shao, M. Simko, M. Stepanov, M. Strikhanov, M. Sumbera, M. Tokarev, M. U. Ashraf, M. Zyzak, N. G. Minaev, N. K. Pruthi, N. Magdy, N. R. Sahoo, N. Schmitz, N. Shah, N. Smirnov, N. Xu, N. Yu, O. D. Tsai, O. Evdokimov, O. Eyser, O. Rusnakova, O. V. Rogachevskiy, P. Bhattarai, P. Chaloupka, P. Federic, P. Filip, P. Huck, P. Kravtsov, P. K. Sahu, P. Pile, P. Seyboth, P. Sorensen, P. Tribedy, P. V. Shanmuganathan, Q. H. Xu, Q. Yang, Q. Y. Shou, R. Aoyama, R. Bellwied, R. Esha, R. E. Tribble, R. Fatemi, R. Haque, R. Lednicky, R. L. Ray, R. Ma, R. Majka, R. Pak, R. P. Scharenberg, R. R. Debbe, R. Reed, R. Sikora, R. S. Longacre, R. Stock, R. Varma, R. Vertesi, R. Witt, S. A. Voloshin, S. B. Nurushev, S. Chattopadhyay, S. Das, S. Esumi, S. Fazio, S. Gupta, S. Heppelmann, S. Horvat, S. Jowzaee, S. Kabana, S. K. Tripathy, S. Luo, S. Margetis, S. McKinzie, S. Mioduszewski, S. Ramachandran, S. Salur, S. Singha, S. S. Shi, STAR Collaboration: L. Adamczyk, S. Trentalange, S. Vokal, S. W. Wissink, S. Yang, S. Zhang, T. D. S. Stanislaus, T. G. Dedovich, T. Huang, T. J. Humanic, T. K. Nayak, T. Lin, T. Ljubicic, T. Niida, T. Nonaka, T. Sugiura, T. Tarnowsky, T. Todoroki, T. Ullrich, V. A. Okorokov, V. Bairathi, W. B. Schmidke, W. Christie, W. Guryn, W. J. Llope, W. Li, W. Q. Shen, W. Solyst, W. W. Jacobs, W. Xie, W. Zha, X. Bai, X. Chen, X. Dong, X. Huang, X. Li, X. Luo, X. M. Sun, X. P. Zhang, X. Zhu, Y. Fisyak, Y. F. Xu, Y. G. Ma, Y. Guo, Y. Li, Y. Liu, Y. Pandit, Y. Panebratsev, Y. Sun, Y. Wang, Y. Wu, Y. X. Pan, Y. Yang, Y. Zhang, Y. Zoulkarneeva, Z. Ahammed, Z. Chang, Z. Feng, Z. G. Xiao, Z. H. Khan, Z. Shi, Z. Sun, Z. Tang, Z. W. Miller, Z. Xu, Z. Ye, Z. Zhang","submitted_at":"2016-08-14T13:10:30Z","abstract_excerpt":"We present the first measurement of charge-dependent directed flow in Cu+Au collisions at $\\sqrt{s_{_{NN}}}$ = 200 GeV. The results are presented as a function of the particle transverse momentum and pseudorapidity for different centralities. A finite difference between the directed flow of positive and negative charged particles is observed that qualitatively agrees with the expectations from the effects of the initial strong electric field between two colliding ions with different nuclear charges. 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Poniatowska, K. Xin, K. Yip, L. C. Bland, L. C. De Silva, L. Didenko, L. E. Dunkelberger, L. Fulek, L. G. Efimov, L. Greiner, L. He, L. K. Kosarzewski, L. Kochenda, L. Kumar, L. Ma, L. Ruan, L. Song, L. V. Nogach, L. Wen, L. Yi, L. Zhou, M. A. C. Lamont, M. A. Lisa, M. Calder\\'on de la Barca S\\'anchez, M. Cherney, Md. Nasim, M. Girard, M. J. Rehbein, M. J. Skoby, M. K. Mustafa, M. K. Sharma, M. Lomnitz, M. M. Aggarwal, M. M. Mondal, M. Posik, M. Przybycien, M. Shao, M. Simko, M. Stepanov, M. Strikhanov, M. Sumbera, M. Tokarev, M. U. Ashraf, M. Zyzak, N. G. Minaev, N. K. Pruthi, N. Magdy, N. R. Sahoo, N. Schmitz, N. Shah, N. Smirnov, N. Xu, N. Yu, O. D. Tsai, O. Evdokimov, O. Eyser, O. Rusnakova, O. V. Rogachevskiy, P. Bhattarai, P. Chaloupka, P. Federic, P. Filip, P. Huck, P. Kravtsov, P. K. Sahu, P. Pile, P. Seyboth, P. Sorensen, P. Tribedy, P. V. Shanmuganathan, Q. H. Xu, Q. Yang, Q. Y. Shou, R. Aoyama, R. Bellwied, R. Esha, R. E. Tribble, R. Fatemi, R. Haque, R. Lednicky, R. L. Ray, R. Ma, R. Majka, R. Pak, R. P. Scharenberg, R. R. Debbe, R. Reed, R. Sikora, R. S. Longacre, R. Stock, R. Varma, R. Vertesi, R. Witt, S. A. Voloshin, S. B. Nurushev, S. Chattopadhyay, S. Das, S. Esumi, S. Fazio, S. Gupta, S. Heppelmann, S. Horvat, S. Jowzaee, S. Kabana, S. K. Tripathy, S. Luo, S. Margetis, S. McKinzie, S. Mioduszewski, S. Ramachandran, S. Salur, S. Singha, S. S. Shi, STAR Collaboration: L. Adamczyk, S. Trentalange, S. Vokal, S. W. Wissink, S. Yang, S. Zhang, T. D. S. Stanislaus, T. G. Dedovich, T. Huang, T. J. Humanic, T. K. Nayak, T. Lin, T. Ljubicic, T. Niida, T. Nonaka, T. Sugiura, T. Tarnowsky, T. Todoroki, T. Ullrich, V. A. Okorokov, V. Bairathi, W. B. Schmidke, W. Christie, W. Guryn, W. J. Llope, W. Li, W. Q. Shen, W. Solyst, W. W. Jacobs, W. Xie, W. Zha, X. Bai, X. Chen, X. Dong, X. Huang, X. Li, X. Luo, X. M. Sun, X. P. Zhang, X. Zhu, Y. Fisyak, Y. F. Xu, Y. G. Ma, Y. Guo, Y. Li, Y. Liu, Y. Pandit, Y. Panebratsev, Y. Sun, Y. Wang, Y. Wu, Y. X. Pan, Y. 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