Insights into Freezeout Dynamics in Symmetric Heavy Ion Collisions with Changing Event Centrality

This study presents the investigation of freezeout parameters, namely the kinetic freezeout temperature (T) and transverse flow velocity ((Formula presented.)), in different centrality intervals with fixed as well as with variable flow profile ((Formula presented.)) in the blast-wave model (using Boltzmann Gibbs statistics). The model is used to fit the experimental data of transverse momentum spectra of (Formula presented.), (Formula presented.), and p in (Formula presented.) – (Formula presented.) and (Formula presented.) – (Formula presented.) collisions at 200 GeV and 2.76 TeV, respectively. In our observation, when the parameter (Formula presented.) is considered as a free parameter, the parameter T decreases from head-on to peripheral collisions, while it increases towards the periphery if (Formula presented.) is fixed. In addition, parameter (Formula presented.) decreases from central to peripheral collisions in both cases. These findings provide valuable insights into the dynamics of quark-gluon plasma formation and expansion in high-energy nuclear collisions. Moreover, the kinetic freezeout temperature T and the transverse flow velocity (Formula presented.) are mass-dependent; while the former becomes larger for massive particles, the latter becomes larger for light particles, showing the mass differential kinetic freezeout scenario.