Kaons and antikaons in isospin asymmetric dense resonance matter at finite temperature

TL;DR

This paper investigates how the properties of kaons and antikaons change in hot, dense, isospin asymmetric matter, considering resonance baryons, to aid understanding of heavy-ion collision experiments.

Contribution

It introduces a comprehensive model including resonance baryons in the in-medium analysis of kaons and antikaons at finite temperature and density.

Findings

Resonance baryons significantly modify meson effective masses.

Mass reduction of kaons and antikaons increases with temperature.

Optical potentials correlate strongly with strangeness fraction.

Abstract

We study the in-medium properties of kaons and antikaons in isospin asymmetric hot and dense resonance matter within the chiral SU(3) hadronic mean field model. Along with nucleons and hyperons, the interactions of $K$ and $\bar K$ mesons with all decuplet baryons ($\Delta^{++,+,0,-}, \Sigma^{*\pm,0},\Xi^{*0,-}, \Omega^{-}$) are explicitly considered in the dispersion relations. The properties of mesons in the chiral SU(3) model are modified at finite density and temperature of asymmetric resonance matter through the exchange of scalar fields $\sigma, \zeta$ and $\delta$ and the vector fields $\omega, \rho$ and $\phi$. The presence of resonance baryons in the medium at finite temperature is observed to modify significantly the effective masses of $K$ and $\bar{K}$ mesons. We also calculated the optical potentials of kaons and antikaons as a function of momentum in resonance matter. The present study of in-medium masses and optical potentials of kaons and antikaons will be important for understanding the experimental observables from the heavy-ion collision experiments where hot and dense matter may be produced. Our results indicate that when resonance baryons are present within the medium at finite baryonic density, the mass reduction of kaons and antikaons becomes more pronounced as the temperature of the medium increases from zero to 100 and 150 MeV. The study of the optical potentials of kaons and antikaons reveals a stronger correlation with strangeness fraction compared to isospin asymmetry.