In this work we address the question of how well the chiral crossover transition can be understood in terms of a noninteracting hadron resonance gas model. Using the latest results on the variation of hadron masses as a function of the pion mass from lattice quantum chromodynamics, we study the temperature dependence of the renormalized chiral condensate in 2+1 flavor QCD. Furthermore, we suggest a better criterion to estimate of the pseudocritical temperature, which gives Tc=161.2±1.7 MeV, which is much improved compared to all the earlier results within the hadron resonance gas model or chiral perturbation theory. For the curvature of the pseudocritical line we find κ2=0.0203(7), which is in very good agreement with continuum extrapolated lattice results.
@article{arxiv.2206.04579,
title = {Chiral condensate from a hadron resonance gas model},
author = {Deeptak Biswas and Peter Petreczky and Sayantan Sharma},
journal= {arXiv preprint arXiv:2206.04579},
year = {2022}
}