# Light baryons below and above the deconfinement transition: medium effects and parity doubling

## TL;DR

This study uses lattice QCD simulations to analyze how baryon properties, especially parity doubling, change across the deconfinement transition, revealing temperature-dependent mass behaviors and chiral symmetry restoration effects.

## Contribution

It provides the first detailed lattice QCD analysis of parity doubling and medium effects on baryons across the deconfinement transition with multiple temperature points.

## Key findings

- Positive-parity masses are temperature independent below Tc.
- Negative-parity masses decrease as temperature approaches Tc.
- Parity doubling occurs above Tc, indicating chiral symmetry restoration.

## Abstract

We study what happens to the Nucleon, Delta and Omega baryons in the hadronic gas and the quark-gluon plasma, with particular interest in parity doubling and its emergence as the plasma is heated. This is done using simulations of lattice QCD, employing the FASTSUM anisotropic Nf=2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature. Below Tc we find that the positive-parity groundstate masses are largely temperature independent, whereas the negative-parity ones are reduced considerably as the temperature increases. This may be of interest for heavy-ion phenomenology. Close to the transition, the masses are nearly degenerate, in line with the expectation from chiral symmetry restoration. Above Tc we find a clear signal of parity doubling in all three channels, with the effect of the heavier s quark visible.