**Parity doubling of nucleons and Delta baryons across the deconfinement phase transition**

*D. De Boni, G. Aarts, C. Allton, S. Hands, B. Jaeger, C. Praki, J.I. Skullerud*

in 34th annual International Symposium on Lattice Field Theory

Contribution: pdf

**Abstract**

At zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate

with the positive-parity partners due to spontaneous breaking of chiral symmetry. However, chiral symmetry is

expected to be restored at sufficiently high temperature, in particular when going from

the hadronic to the quark-gluon plasma (QGP) phase. This would imply that channels with opposite parity

become degenerate. We study the nucleon (spin 1/2) and Delta (spin 3/2) baryons in both

parity sectors using lattice QCD. The range of temperatures spans both the hadronic and QGP phases. Using the

FASTSUM anisotropic $N_f = 2 + 1$ ensembles, we analyze the correlation functions and the

spectral functions using respectively exponential fits and the Maximum Entropy Method.

We find clear evidence of in-medium effects in the hadronic phase, especially for the negative-parity ground state, and of parity doubling in the QGP phase.