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Phys Rev Lett. 2017 Jan 06;118(1):012301. doi: 10.1103/PhysRevLett.118.012301. Epub 2017 Jan 05.

Charge-Dependent Directed Flow in Cu+Au Collisions at sqrt[s_{NN}]=200  GeV.

Physical review letters

L Adamczyk, J K Adkins, G Agakishiev, M M Aggarwal, Z Ahammed, I Alekseev, D M Anderson, R Aoyama, A Aparin, D Arkhipkin, E C Aschenauer, M U Ashraf, A Attri, G S Averichev, X Bai, V Bairathi, 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, I Bunzarov, J Butterworth, H Caines, M Calderón de la Barca Sánchez, J M Campbell, D Cebra, I Chakaberia, P Chaloupka, Z Chang, A Chatterjee, S Chattopadhyay, X Chen, J H 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, S Esumi, O Evdokimov, O Eyser, R Fatemi, S Fazio, P Federic, J Fedorisin, Z Feng, P Filip, E Finch, 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, S Gupta, A Gupta, W Guryn, A I Hamad, A Hamed, R Haque, J W Harris, L He, S Heppelmann, S Heppelmann, A Hirsch, G W Hoffmann, S Horvat, B Huang, X Huang, H Z Huang, T Huang, P Huck, T J Humanic, G Igo, W W Jacobs, A Jentsch, J Jia, K Jiang, S Jowzaee, E G Judd, S Kabana, D Kalinkin, K Kang, K Kauder, H W Ke, D Keane, A Kechechyan, Z H Khan, D P Kikoła, I Kisel, A Kisiel, L Kochenda, D D Koetke, L K Kosarzewski, A F Kraishan, P Kravtsov, K Krueger, L Kumar, M A C Lamont, J M Landgraf, K D Landry, J Lauret, A Lebedev, R Lednicky, J H Lee, Y Li, C Li, W Li, X Li, X Li, T Lin, M A Lisa, Y Liu, F Liu, T Ljubicic, W J Llope, M Lomnitz, R S Longacre, X Luo, S Luo, G L Ma, R Ma, Y G Ma, L Ma, N Magdy, R Majka, A Manion, S Margetis, C Markert, H S Matis, D McDonald, S McKinzie, K Meehan, J C Mei, Z W Miller, N G Minaev, S Mioduszewski, D Mishra, B Mohanty, M M Mondal, D A Morozov, M K Mustafa, B K Nandi, Md Nasim, T K Nayak, G Nigmatkulov, T Niida, L V Nogach, T Nonaka, J Novak, S B Nurushev, G Odyniec, A Ogawa, K Oh, V A Okorokov, D Olvitt, B S Page, R Pak, Y X Pan, Y Pandit, Y Panebratsev, B Pawlik, H Pei, C Perkins, P Pile, J Pluta, K Poniatowska, J Porter, M Posik, A M Poskanzer, N K Pruthi, M Przybycien, J Putschke, H Qiu, 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, 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, A Sharma, M K Sharma, B Sharma, W Q Shen, S S Shi, Z Shi, Q Y Shou, E P Sichtermann, R Sikora, M Simko, S Singha, M J Skoby, D Smirnov, N Smirnov, W Solyst, L Song, P Sorensen, H M Spinka, B Srivastava, T D S Stanislaus, M Stepanov, R Stock, M Strikhanov, B Stringfellow, T Sugiura, M Sumbera, B Summa, Z Sun, Y Sun, X M Sun, B Surrow, D N Svirida, A H Tang, Z Tang, T Tarnowsky, A Tawfik, J Thäder, J H Thomas, A R Timmins, D Tlusty, T Todoroki, M Tokarev, S Trentalange, R E Tribble, P Tribedy, S K Tripathy, O D Tsai, T Ullrich, D G Underwood, I Upsal, G Van Buren, G van Nieuwenhuizen, R Varma, A N Vasiliev, R Vertesi, F Videbæk, S Vokal, S A Voloshin, A Vossen, G Wang, F Wang, J S Wang, Y Wang, H Wang, Y Wang, J C Webb, G Webb, L Wen, G D Westfall, H Wieman, S W Wissink, R Witt, Y Wu, Z G Xiao, W Xie, G Xie, K Xin, Q H Xu, Y F Xu, H Xu, Z Xu, N Xu, J Xu, C Yang, Y Yang, S Yang, Y Yang, Q Yang, Y Yang, Z Ye, Z Ye, L Yi, K Yip, I-K Yoo, N Yu, H Zbroszczyk, W Zha, J Zhang, X P Zhang, S Zhang, Y Zhang, J B Zhang, Z Zhang, S Zhang, J Zhang, J Zhao, C Zhong, L Zhou, X Zhu, Y Zoulkarneeva, M Zyzak,

Affiliations

  1. AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.
  2. University of Kentucky, Lexington, Kentucky 40506-0055, USA.
  3. Joint Institute for Nuclear Research, Dubna, 141 980, Russia.
  4. Panjab University, Chandigarh 160014, India.
  5. Variable Energy Cyclotron Centre, Kolkata 700064, India.
  6. Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia.
  7. National Research Nuclear University MEPhI, Moscow 115409, Russia.
  8. Texas A&M University, College Station, Texas 77843, USA.
  9. Brookhaven National Laboratory, Upton, New York 11973, USA.
  10. Tsinghua University, Beijing 100084, China.
  11. Central China Normal University, Wuhan, Hubei 430079, China.
  12. National Institute of Science Education and Research, Bhubaneswar 751005, India.
  13. University of Houston, Houston, Texas 77204, USA.
  14. University of Jammu, Jammu 180001, India.
  15. University of Texas, Austin, Texas 78712, USA.
  16. Czech Technical University in Prague, FNSPE, Prague, 115 19, Czech Republic.
  17. Nuclear Physics Institute AS CR, 250 68 Prague, Czech Republic.
  18. Kent State University, Kent, Ohio 44242, USA.
  19. Rice University, Houston, Texas 77251, USA.
  20. Yale University, New Haven, Connecticut 06520, USA.
  21. University of California, Davis, California 95616, USA.
  22. Ohio State University, Columbus, Ohio 43210, USA.
  23. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.
  24. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
  25. Creighton University, Omaha, Nebraska 68178, USA.
  26. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  27. University of California, Berkeley, California 94720, USA.
  28. Institute of Physics, Bhubaneswar 751005, India.
  29. Shandong University, Jinan, Shandong 250100, China.
  30. Institute of High Energy Physics, Protvino 142281, Russia.
  31. Pennsylvania State University, University Park, Pennsylvania 16802, USA.
  32. Lamar University, Physics Department, Beaumont, Texas 77710, USA.
  33. University of California, Los Angeles, California 90095, USA.
  34. University of Illinois at Chicago, Chicago, Illinois 60607, USA.
  35. Southern Connecticut State University, New Haven, Connecticut 06515, USA.
  36. Purdue University, West Lafayette, Indiana 47907, USA.
  37. Valparaiso University, Valparaiso, Indiana 46383, USA.
  38. Warsaw University of Technology, Warsaw 00-661, Poland.
  39. Temple University, Philadelphia, Pennsylvania 19122, USA.
  40. University of Science and Technology of China, Hefei, Anhui 230026, China.
  41. National Cheng Kung University, Tainan 70101, Taiwan.
  42. Indiana University, Bloomington, Indiana 47408, USA.
  43. State University Of New York, Stony Brook, New York 11794, USA.
  44. Wayne State University, Detroit, Michigan 48201, USA.
  45. Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
  46. Argonne National Laboratory, Argonne, Illinois 60439, USA.
  47. Indian Institute of Technology, Mumbai 400076, India.
  48. Michigan State University, East Lansing, Michigan 48824, USA.
  49. Pusan National University, Pusan 46241, Korea.
  50. Institute of Nuclear Physics PAN, Cracow 31-342, Poland.
  51. Lehigh University, Bethlehem, Pennsylvania 18015, USA.
  52. Max-Planck-Institut fur Physik, Munich 80805, Germany.
  53. World Laboratory for Cosmology and Particle Physics (WLCAPP), Cairo 11571, Egypt.
  54. United States Naval Academy, Annapolis, Maryland 21402, USA.

PMID: 28106415 DOI: 10.1103/PhysRevLett.118.012301

Abstract

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. The measured difference in directed flow is much smaller than that obtained from the parton-hadron-string-dynamics model, which suggests that most of the electric charges, i.e., quarks and antiquarks, have not yet been created during the lifetime of the strong electric field, which is of the order of, or less than, 1  fm/c.

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