Analysis of the back-to-back correlation function of kaonsat different evolution temperatures

Abstract

In the high temperature and high density in-medium system formed by high energy heavy ion collisions, the interaction between particles and the medium system can be squeezed into quasi-particles by the Bogoliubov transformation. The mass of quasi-particles is different from the mass of free particles received by the detector, thus producing the back-to-back correlation between two particles. In this paper, the effective mass of quasi-particle model is used as a variable to analyze the back-to-back correlation function of the kaons. With the expansion and evolution of the high temperature and high density in-medium system, it has to undergo four different stages of temperature of the quark-gluon plasma phase transition, full chemical equilibrium, partial chemical equilibrium, thermal equilibrium. Analysis of the back-to-back correlation function of kaons was based on four different temperature values given theoretically and experimentally. The results show that the partial chemical equilibrium model marked by the frozen-out temperature T pch =140 MeV is an ideal particle frozen-out model for calculating large momentum meson correlation.