Jul 24 – 30, 2016
Highfield Campus, University of Southampton
Europe/London timezone

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

Jul 29, 2016, 2:20 PM
Building 32 Room 1015 (Highfield Campus, University of Southampton)

Building 32 Room 1015

Highfield Campus, University of Southampton

Talk Nonzero Temperature and Density Nonzero Temperature and Density


Mr Davide De Boni (Swansea University)


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)


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)

Presentation materials