Lattice QCD at non-zero chemical potential and the resonance gas model

TL;DR

This paper investigates QCD thermodynamics at finite temperature and baryon chemical potential using lattice calculations, highlighting the significance of resonances in the transition to quark-gluon plasma and comparing resonance gas models with lattice results.

Contribution

It demonstrates how resonance gas models can explain the transition temperature's dependence on quark mass and connects lattice QCD results with hadronic resonance properties.

Findings

Resonance gas models match lattice results for the equation of state.

Transition temperature dependence on quark mass aligns with lines of constant energy density.

Resonances play a crucial role in the QCD phase transition at finite density.

Abstract

We present results from lattice calculations on the thermodynamics of QCD at non-zero temperature and baryon chemical potential and discuss the role of resonances for the occurrence of the transition to the quark-gluon plasma in hot and dense matter. Properties of a hadronic resonance gas are compared to lattice results on the equation of state at zero as well as non-zero baryon chemical potential. Furthermore, it is shown that the quark mass dependence of the transition temperature can be understood in terms of lines of constant energy density in a resonance gas.