Fluctuations of conserved charges at finite temperature from lattice QCD

TL;DR

This study provides comprehensive lattice QCD calculations of quark number susceptibilities across a range of temperatures, comparing results with the Hadron Resonance Gas model to understand fluctuations of conserved charges.

Contribution

The paper presents the first continuum-extrapolated lattice QCD results for flavor diagonal and non-diagonal quark number susceptibilities with physical quark masses.

Findings

Good agreement with Hadron Resonance Gas model below transition temperature

Continuum extrapolated results across multiple lattice spacings

Detailed analysis of flavor correlations in quark susceptibilities

Abstract

We present the full results of the Wuppertal-Budapest lattice QCD collaboration on flavor diagonal and non-diagonal quark number susceptibilities with 2+1 staggered quark flavors, in a temperature range between 125 and 400 MeV. The light and strange quark masses are set to their physical values. Lattices with Nt=6, 8, 10, 12, 16 are used. We perform a continuum extrapolation of all observables under study. A Symanzik improved gauge and a stout-link improved staggered fermion action is utilized. All results are compared to the Hadron Resonance Gas model predictions: good agreement is found in the temperature region below the transition.