Medium modification of hadron masses and the thermodynamics of hadron resonance gas model

TL;DR

This paper investigates how temperature and baryon density-dependent hadron masses influence the thermodynamics of hadronic matter, using a modified hadron resonance gas model and NJL model calculations, with comparisons to lattice QCD data.

Contribution

It introduces a framework incorporating T and μ dependent hadron masses into the hadron resonance gas model, enhancing the understanding of thermodynamics near the QCD transition.

Findings

Thermodynamical quantities align well with lattice QCD at μ=0.

T and μ dependence significantly affect transport properties near transition.

Modified masses impact the equation of state of hadronic matter.

Abstract

We study the effect of temperature (T) and baryon density ({\mu}) dependent hadron masses on the thermodynamics of hadronic matter. We use linear scaling rule in terms of constituent quark masses for all hadrons except for light mesons. T and {\mu} dependent constituent quark masses and the light mesons masses are computed using 2+1 flavor Nambu-Jona-Lasinio (NJL) model. We compute the thermodynamical quantities of hadronic matter within excluded volume hadron resonance gas model (EHRG) with these T and {\mu} dependent hadron masses. We confront the thermodynamical quantities with the lattice quantum chromodynamics (LQCD) at {\mu} = 0 GeV. Further, we comment on the effect of T and {\mu} dependent hadron masses on the transport properties near the transition temperature.