Identified charged hadron production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 54.4 GeV with the STAR detector

Abstract

We present results on the production of $\ddot{I}{€}^{\pm }$, $K^{\pm }$, $p$, and $\bar{p}$ in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 54.4~GeV using the STAR detector at RHIC, at midrapidity ($|y|<$ 0.1). Invariant yields of these particles as a function of transverse momentum are shown. We determine bulk properties such as integrated particle yields ($dN/dy$), mean transverse momentum ($⟨p_T⟩$), particle ratios, which provide insight into the particle production mechanisms. Additionally, the kinetic freezeout parameters ($T_{\text{kin}}$ and $⟨{\hat{I}}_T^2⟩$), which provide information about the dynamics of the system at the time of freezeout, are obtained. The Bjorken energy density ($\hat{I}{\mu }_{\mathrm{BJ}}$), which gives an estimate of the energy density in the central rapidity region of the collision zone at the formation time $\ddot{I}„$, is calculated and presented as a function of multiplicity for various energies. The results are compared with those from the models such as A Multi-Phase Transport (AMPT) and Heavy Ion Jet INteraction Generator (HIJING) for further insights.

14 pages, 16 figures