Azimuthal anisotropy in Cu+Au collisions at s NN =200 GeV
Deryk Anderson , Xin-Nan Chen , Xin-Nan Chen , J Cheng , Martin Girard , Y. Guo , Hong-Zhong HUANG , Wei-Te Huang , Daniel Kikoła , Adam Kisiel , Leszek Kosarzewski , W. Li , Fengwei Liu , Pengfei Liu , Mayer J. R. R. , Lin Ma , A. M. Mustafa Al Bakri , Bernd Page , Jan Pluta , Katarzyna Poniatowska , Joanna Porter-Sobieraj , J. Schambach , R Sikora , S. Tripathy , Barbara Trzeciak , J. W. Xu , Cheng-Zhong Xu , S. Yang , Wuqiang Q Yang , Hanna Zbroszczyk , Jian Zhang , Jian Zhang , Liren Zhang , Jian Zhang , J Zhao , X. Zhu
The azimuthal anisotropic flow of identified and unidentified charged particles has been systematically studied in Cu+Au collisions at sNN=200 GeV for harmonics n=1-4 in the pseudorapidity range |η|<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 sNN=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 pseudorapidity values, i.e., the Cu-going direction. The mean transverse momentum projected onto the spectator plane (px) in Cu+Au collision also exhibits approximately linear dependence on pseudorapidity with the intercept at about η≈-0.4 (shifted from zero in the Au-going direction), closer to the rapidity of the Cu+Au system center of mass. The observed dependencies find a natural explanation in a picture of the directed flow originating partly due the "tilted source" and partly due to the asymmetry in the initial density distribution. A charge dependence of (px) was also observed in Cu+Au collisions, consistent with 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 sNN=2.76 TeV, indicating a similar magnitude of dipolelike 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 multiphase transport model. For all harmonics with n≥2 we observe an approximate scaling of vn with the number of constituent quarks; this scaling works as well in Cu+Au collisions as it does in Au+Au collisions.
|Collective author||L. Adamczyk, J.R. Adams, J.K. Adkins, G. Agakishiev, M.M. Aggarwal, Z. Ahammed, N.N. Ajita.....|
|Total number of authors||350|
|Journal series||Physical Review C, ISSN 2469-9985, e-ISSN 2469-9993 [1538-4497], (A 35 pkt)|
|Publication size in sheets||1.05|
|Score|| = 35.0, 21-11-2018, ArticleFromJournal|
= 45.0, 21-11-2018, ArticleFromJournal
|Publication indicators||= 0; : 2017 = 3.304 (2) - 2017=3.106 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.