Latest results of charged hadron flow measurements in CuAu collisions at RHIC-PHENIX

摘要

Measurements of azimuthal anisotropic flow υ_N for inclusive charged hadrons and identified particles at mid rapidity in Cu＋Au collisions at S_(NN)~(1/2) = 200GeV are presented. The data were recorded by the PHENIX experiment at Relativistic Heavy Ion Collider(RHIC). Directed, elliptic and triangular flow as a function of transverse momentum p_T are measured with respect to event planes. The inclusive charged hadron υ_1 shows the negative value at high p_T- The υ_2 and υ_3 are compared to those in Au＋Au and Cu＋Cu collisions. We find the υ_2 and υ_3 follow an empirical scaling with 1/(ε_nN_(part)~(1/3)). We also compare the υ_2 and υ_3 to hydrodynamical predictions. The identified particles υ_2 and υ_3 show a mass ordering in low p_T region and baryon and meson splitting in high p_T region. However the identified hadron υ_1 only shows mass ordering in mid p_T region.