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

Central China Normal University, Wuhan, Hubei 430079

^* e-mail: liuzw@mails.ccnu.edu.cn

Published online: 26 June 2024

Abstract

In these proceedings, we present transverse momentum dependence of the mid-rapidity slope of directed flow (dv₁/dy|_y=0) for π⁺ and K_S⁰ in Au + Au collisions at √S_NN = 3.0, 3.2, 3.5, and 3.9 GeV. Both π⁺ and K_S⁰ show negative v₁ slope at low p_T (p_T < 0.6 GeV/c). Collision energy dependence of v₁ slope and p_T -integrated v₂ for π^±, K_S⁰, and Λ are also presented. A comparison to JAM model calculations indicates that spectator shadowing can lead to anti-flow at low p_T. In addition, a breaking of the Number of Constitute Quark (NCQ) scaling of elliptic flow (v₂) is observed at √S_NN = 3.2 GeV, which implies the dominance of hadronic degrees of freedom occurs in collisions at √S_NN = 3.2 GeV and below.