Flavor Diagonal and Off-Diagonal Susceptibilities in a Quasiparticle Model of the Quark-Gluon Plasma

TL;DR

This paper models flavor susceptibilities in the quark-gluon plasma using a quasiparticle approach and compares results with lattice QCD data, providing insights into baryon density effects.

Contribution

It introduces a phenomenological quasiparticle model that accurately reproduces flavor susceptibilities and related coefficients in the quark-gluon plasma.

Findings

Model matches lattice QCD data for two quark flavors.

Susceptibilities effectively probe baryon density effects.

Baryon charge is carried by quark-quasiparticle excitations.

Abstract

The Taylor coefficients of flavor diagonal and off-diagonal susceptibilities as well as baryon number, isovector and electric charge susceptibilities are considered within a phenomenological quasiparticle model of the quark-gluon plasma and successfully compared with lattice QCD data for two degenerate quark flavors. These susceptibility coefficients represent sensible probes of baryon density effects in the equation of state. The baryon charge is carried, in our model, by quark-quasiparticle excitations for hard momenta.