Hyperons in thermal QCD from the lattice

TL;DR

This study investigates how hyperon and light baryon masses change with temperature in lattice QCD, revealing parity doubling above the deconfinement transition and providing insights into in-medium hadronic properties.

Contribution

It presents the first lattice QCD analysis of hyperon and baryon spectra across the deconfinement transition, highlighting temperature effects on parity states and degeneracy.

Findings

Positive parity masses are temperature independent in the hadronic phase.

Negative parity states decrease in mass as temperature increases.

Parity doubling occurs above the deconfinement temperature.

Abstract

We study the spectrum of light baryons and hyperons as a function of temperature using lattice gauge theory methods. We find that masses of positive parity states are temperature independent, within errors, in the hadronic phase. The negative parity states decrease in mass as the temperature increases. Above the deconfining temperature, lattice correlators and spectral functions show a degeneracy between parity sectors, i.e. parity doubling. We apply our findings to an in-medium Hadron Resonance Gas model. The techniques used in this study include direct analysis of the hadronic correlation functions, conventional fitting procedures, and the Maximum Entropy Method.