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

Gert Aarts, Chris Allton, Davide de Boni*, Simon Hands, Benjamin Jäger, Chrisanthi Praki, Jon-Ivar Skullerud

*Corresponding author for this work

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Abstract

In this work we analyse positive- and negative-parity channels for the nucleon (spin $1/2$ octet), $\Delta$ and $\Omega$ 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 $\Delta$ baryon channels in the QGP phase. For the $\Omega$ 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 $N_f = 2 + 1$ ensembles.
Original languageEnglish
Article number07004
JournalE P J Web of Conferences
Volume137
Number of pages8
ISSN2100-014X
DOIs
Publication statusPublished - 22. Mar 2017
EventXIIth Quark Confinement and the Hadron Spectrum - Thessaloniki, Greece
Duration: 28. Aug 20164. Sep 2016
Conference number: 12

Conference

ConferenceXIIth Quark Confinement and the Hadron Spectrum
Number12
CountryGreece
CityThessaloniki
Period28/08/201604/09/2016

Bibliographical note

Comments: 8 pages, 3 figures. Talk presented at the XIIth Quark Confinement and the Hadron Spectrum Conference, 28 August - 4 September 2016, Thessaloniki, Greece

Keywords

  • hep-lat

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