Measurement of Azimuthal Anisotropy at RHIC-PHENIX

Nara Women’s University, Ktauoya Nishimachi, Nara, 630-8263, Japan

^a e-mail: mayap@bnl.gov

Published online: 12 April 2017

Abstract

The transverse momentum (p_T) and centrality dependence of the azimuthal anisotropy of second harmonics(υ₂) are measured for charged hadron species at various collision systems and energies such as √S_NN = 62.4 and 200 GeV in Cu + Cu and Au + Au collisions and at √S_NN = 200 GeV in Cu + Au collisions by the PHENIX experiment at RHIC. The higher order anisotropy (υ₃) are also measured for charged hadron at √S_NN = 200 GeV in Cu + Cu, Au + Au and Au + Cu collisions. From these systematic study, we found that the all results are consistent with eccentricity scaling, quark number + KE_T scaling and N_part^1/3) scaling except at small N_part in Cu + Cu at 62.4 GeV. Taking these scaling (quark number, KE_T, eccentricity and N_part^1/3) into account, there is a universal scaling for π/K/p υ₂ with different energies, collision sizes and particle species.