Abstract
We present results on the production of pi(+/-), K-+/-, p, and <(pover bar> in Au + Au collisions at root sNN = 54.4 GeV using the STAR detector at RHIC, at midrapidity (vertical bar y vertical bar < 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 (< pT >), particle ratios, which provide insight into the particle production mechanisms. Additionally, the kinetic freezeout parameters (T-kin and <beta(T)>), which provide information about the dynamics of the system at the time of freezeout, are obtained. The Bjorken energy density (epsilon(BJ)), which gives an estimate of the energy density in the central rapidity region of the collision zone at the formation time tau, 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.