Identified Hadron Production at Mid-rapidity in Au+Au Collisions at  \(\sqrt{s_{NN}} = 54.4\) GeV at STAR

Quantum Chromodynamics (QCD) predicts that at sufficiently high temperature (T) and/or baryon chemical potential ( \(\mu _B\) ), the state of matter is in the form of quarks and gluons, which are no longer confined within hadrons. This deconfined state of matter is known as the Quark-Gluon Plasma (QGP). The goal of relativistic heavy-ion collision experiments is to create such a hot and dense state of matter and study its properties. Measurements of identified particle spectra in Au+Au collisions provide information on the bulk properties, such as integrated yield (dN/dy), average transverse momenta ( \(\langle p_T \rangle \) ), particle ratios, and freeze-out parameters of the medium produced. The systematic study of bulk properties sheds light on the particle production mechanism in these collisions. Also, the centrality dependence of the freeze-out parameters provides an opportunity to explore the QCD phase diagram. We present the transverse momentum spectra of identified hadrons ( \(\pi ^{\pm }\) , \(K^{\pm }\) , p, and \(\bar{p}\) ) at mid-rapidity ( \(|y| < 0.1\) ) in Au+Au collisions at \(\sqrt{s_{\textrm{NN}}} = 54.4\) GeV. The centrality dependence of dN/dy, particle ratios, and kinetic freeze-out parameters are also presented, and their physics implications are discussed. In addition, we compare our results with previously published results at other collision energies.