Elliptic and triangular flow of (multi-)strange hadrons and $\phi$ mesons in BES-II energies at STAR

TL;DR

This paper reports measurements of elliptic and triangular flow of strange hadrons and $\,phi$ mesons in BES-II energies, showing NCQ scaling and differences between particles and anti-particles, indicating partonic collectivity.

Contribution

First detailed flow measurements of (multi-)strange hadrons and $\,phi$ mesons at BES-II energies, highlighting NCQ scaling and particle-antiparticle differences.

Findings

NCQ scaling of $v_2$ and $v_3$ holds at 19.6 GeV

Anti-particles show better NCQ scaling than particles

Indicates collective flow develops in the partonic stage

Abstract

In these proceedings, we present the measurements of elliptic ($v_2$) and triangular ($v_3$) flow of (multi-)strange hadrons and $\phi$ mesons in 19.6 and 14.6 GeV Au+Au collisions from STAR. The number of constituent quark (NCQ) scaling of $v_2$ and $v_3$ holds well at $\sqrt{ s_{\mathrm{ NN }} } $ = 19.6 GeV, which indicates the collective flow is built up in the partonic stage. At these energies, the anti-particles show better NCQ scaling than the particles for both $v_2$ and $v_3$, which may be caused by the different contributions from the produced and transported quarks.