Unified thermal freeze-out model and its parameters at RHIC

The variation of the parameters (thermal freeze-out temperature, transverse collective flow velocity parameter, distribution width and the nuclear transparency parameters a and b  ) of the unified statistical thermal freeze-out model of multi-particle production with the center of mass energy, sNN have been studied at RHIC. We find that the transverse collective flow velocity parameter increases with the increase in sNN. The thermal/hydro-dynamical freeze-out temperature is found to decrease with the increase in sNN. It is found that the freeze-out of doubly and triply strange particles occur at somewhat earlier times compared to non-strange and singly strange hadronic species during the evolution of the fireball at each energy. The value of “a” is found to increase with the decrease in energy while as the value of “b” is found to increase with the increase in center of mass energy.