Conserved Charge Susceptibilities in a Chemically Frozen Hadronic Gas

TL;DR

This paper calculates charge susceptibilities in a hadronic gas using the resonance gas model, examining chemical freeze-out effects and implications for QCD phase transition studies.

Contribution

It introduces a detailed analysis of conserved charge susceptibilities considering chemical freeze-out and resonance decays within the hadron resonance gas model.

Findings

Diagonal and off-diagonal susceptibilities computed

Impact of chemical freeze-out on susceptibilities analyzed

Implications for hydrodynamic fluctuations and QCD critical point discussed

Abstract

In a hadronic gas with three conserved charges (electric charge, baryon number, and strangeness) we employ the hadron resonance gas model to compute both diagonal and off-diagonal susceptibilities. We model the effect of chemical freeze-out in two ways: one in which all particle numbers are conserved below the chemical freeze-out temperature and one which takes into account resonance decays. We then briefly discuss possible implications these results may have on two active areas of research, hydrodynamic fluctuations and the search for the QCD critical point.