Pion Mass Shift and the Kinetic Freeze Out Process

TL;DR

This paper investigates how in-medium pion mass modifications influence the kinetic freeze-out process in a pion gas, finding minimal effects on freeze-out parameters and particle distributions.

Contribution

It introduces a model analyzing the impact of pion mass shifts on the freeze-out process, showing limited effects on key observables.

Findings

Minimal change in freeze-out temperature and flow velocity

Insignificant modification of particle distribution functions

Pion mass shifts have limited impact on freeze-out dynamics

Abstract

The kinetic Freeze Out process of a pion gas through a finite layer with time-like normal is considered. The pion gas is described by a Boltzmann gas with elastic collisions among the pions. Within this model, the impact of the in-medium pion mass modification on the Freeze Out process is studied. A marginal change of the Freeze Out variables temperature and flow velocity and an insignificant modification of the frozen out particle distribution function has been found.