Anisotropic flow of identified particles in Au + Au collisions at √SNN = 3 - 3.9 GeV at RHIC

Abstract

In these proceedings, we present transverse momentum dependence of the mid-rapidity slope of directed flow (dv1/dy|y=0) for π+ and KS0 in Au + Au collisions at √SNN = 3.0, 3.2, 3.5, and 3.9 GeV. Both π+ and KS0 show negative v1 slope at low pT (pT < 0.6 GeV/c). Collision energy dependence of v1 slope and pT -integrated v2 for π±, KS0, and Λ are also presented. A comparison to JAM model calculations indicates that spectator shadowing can lead to anti-flow at low pT. In addition, a breaking of the Number of Constitute Quark (NCQ) scaling of elliptic flow (v2) is observed at √SNN = 3.2 GeV, which implies the dominance of hadronic degrees of freedom occurs in collisions at √SNN = 3.2 GeV and below.