# The 34th International Symposium on Lattice Field Theory (Lattice 2016)

24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

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

29 Jul 2016, 14:20
20m
Building 32 Room 1015 (Highfield Campus, University of Southampton)

### Building 32 Room 1015

#### Highfield Campus, University of Southampton

Talk Nonzero Temperature and Density

### Speaker

Mr Davide De Boni (Swansea University)

### Description

At zero temperature nucleons and their parity partners have non-degenerate masses 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, implying that the parity partners should become degenerate. We study the nucleon (spin 1/2) and Delta (spin 3/2) baryons in both parity sectors for a range of temperatures in the confined and QGP phases. Using anisotropic $N_f = 2+1$ flavour simulations, we analyse the correlation functions and the spectral functions using respectively exponential fits and the Maximum Entropy Method. We find a clear sign of parity doubling for both baryons in the QGP phase: the parity state masses become degenerate and their corresponding correlators become essentially identical.

### Primary author

Mr Davide De Boni (Swansea University)

### Co-authors

Dr Benjamin Jäger (Swansea University) Ms Chrisanthi Praki (Swansea University) Prof. Christopher Allton (Swansea University) Prof. Gert Aarts (Swansea University) Dr Jon-Ivar Skullerud (Maynooth University) Prof. Simon Hands (Swansea University)

 Slides