Aarts, Gert and Allton, Chris and De Boni, Davide and Hands, Simon and Praki, Chrisanthi and Jager, Benjamin and Skullerud, Jon-Ivar (2017) Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition. EPJ Web of Conferences, 137. 07004. ISSN 2100-014X

Preview

Download (1MB) | Preview

Abstract

In this work we analyse positive- and negative-parity channels for the nucleón (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral symmetry is spontaneously broken, causing positive- and negative-parity ground states to have different masses. However, chiral symmetry is expected to be restored (for massless quarks) around the crossover temperature, implying that the two opposite parity channels should become degenerate. Here we study what happens in a temperature range which includes both the hadronic and the quark gluon plasma (QGP) phase. By analysing the correlation and spectral functions via exponential fits and the Maximum Entropy Method respectively, we have found parity doubling for the nucleon and Δ baryon channels in the QGP phase. For the Ω baryon we see a clear signal of parity doubling at the crossover temperature, which is however not complete, due to the nonzero strange quark mass. Moreover, in-medium effects in the hadronic phase are evident for all three baryons, in particular for the negative-parity ground states. This might have implications for the hadron resonance gas model. In this work we used the FASTSUM anisotropic Nf = 2 + 1 ensembles.

Item Type:	Article
Additional Information:	This paper was presented at the XIIth Quark Confinement and the Hadron Spectrum, 29 Aug - 3 Sep 2016, Thessaloniki, Greece.
Keywords:	Correlation analysis; Quarks; Phase transitions; Maximum entropy method; Maximum entropy; Parity; Baryons; Channels; Quantum chromodynamics; Symmetry;
Academic Unit:	Faculty of Science and Engineering > Theoretical Physics
Item ID:	12067
Identification Number:	https://doi.org/10.1051/epjconf/201713707004
Depositing User:	Dr. Jonivar Skullerud
Date Deposited:	02 Jan 2020 14:32
Journal or Publication Title:	EPJ Web of Conferences
Publisher:	EDP Sciences
Refereed:	Yes
URI:	Publisher Organisation
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

Repository Staff Only(login required)

Item control page

Downloads

Origin of downloads