Study of the bulk properties of the system formed in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.5 GeV using the STAR detector at RHIC

TL;DR

This paper reports the first measurements of identified hadron spectra and azimuthal anisotropy in Au+Au collisions at 14.5 GeV, analyzing bulk properties and collective behavior across different energies and centralities.

Contribution

It provides new experimental data at 14.5 GeV, extending the understanding of collision dynamics and freeze-out conditions in heavy-ion collisions.

Findings

Consistent baryon and anti-baryon elliptic flow at 14.5 GeV.

Energy dependence observed in chemical and kinetic freeze-out parameters.

Systematic trends in baryon chemical potential and radial flow with energy.

Abstract

We present the first measurements of the transverse momentum spectra and azimuthal anisotropy of the identified hadrons ($\pi^{+}$, $\pi^{-}$, $K^{+}$, $K^{-}$, $p(\bar{p})$, $K^{0}_{s}$, $\Lambda(\bar{\Lambda})$ and $\phi$) at mid-rapidity in Au+Au collisions at $\sqrt{s_{NN}}$ = 14.5 GeV for various collision centralities. These measurements are compared to corresponding results from other BES energies. The bulk properties of the system, like the chemical and kinetic freeze-out conditions and the collectivity extracted from the measured yields of the produced particles are presented. The difference between baryon and anti-baryon elliptic flow for minimum bias collisions previously reported by STAR is also observed in the new data taken at $\sqrt{s_{NN}}$ = 14.5 GeV. Furthermore, the new data at 14.5 GeV are consistent with the trend established by the results at lower and higher beam energies. The energy and centrality dependence of the baryon chemical potential ($\mu_{B}$), radial flow velocity ($\langle\beta\rangle$), and chemical and kinetic freeze-out temperatures are discussed systematically.