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

Abstract

We present the first measurements of the transverse momentum spectra and azimuthal anisotropy of the identified hadrons ($π^{+}$, $π^{-}$, $K^{+}$, $K^{-}$, $p(\bar{p})$, $K^{0}_{s}$, $Λ(\barΛ)$ and $ϕ$) 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 ($μ_{B}$), radial flow velocity ($\langleβ\rangle$), and chemical and kinetic freeze-out temperatures are discussed systematically.

4 pages, 12 figures, Proceedings of the Quark Matter 2015 conference