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Light baryons below and above the deconfinement transition: medium effects and parity doubling

Gert Aarts Orcid Logo, Chris Allton Orcid Logo, Davide De Boni, Simon Hands, Benjamin Jäger, Chrisanthi Praki, Jon-Ivar Skullerud

Journal of High Energy Physics, Volume: 2017, Issue: 6, Pages: 1 - 30

Swansea University Authors: Gert Aarts Orcid Logo, Chris Allton Orcid Logo, Davide De Boni, Simon Hands

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DOI (Published version): 10.1007/jhep06(2017)034

Abstract

We study what happens to the N , Δ and Ω baryons in the hadronic gas and the quark-gluon plasma, with particular interest in parity doubling and its emergence as the plasma is heated. This is done using simulations of lattice QCD, employing the FASTSUM anisotropic Nf = 2 + 1 ensembles, with four tem...

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Published in: Journal of High Energy Physics
ISSN: 1029-8479
Published: Springer Science and Business Media LLC 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34210
Abstract: We study what happens to the N , Δ and Ω baryons in the hadronic gas and the quark-gluon plasma, with particular interest in parity doubling and its emergence as the plasma is heated. This is done using simulations of lattice QCD, employing the FASTSUM anisotropic Nf = 2 + 1 ensembles, with four temperatures below and four above the deconfinement transition temperature. Below Tc we find that the positive-parity groundstate masses are largely temperature independent, whereas the negative-parity ones are reduced considerably as the temperature increases. This may be of interest for heavy-ion phenomenology. Close to the transition, the masses are nearly degenerate, in line with the expectation from chiral symmetry restoration. Above Tc we find a clear signal of parity doubling in all three channels, with the effect of the heavier s quark visible.
Keywords: Lattice Quantum Field Theory, Phase Diagram of QCD, Quark-Gluon Plasma, Thermal Field Theory
College: Faculty of Science and Engineering
Issue: 6
Start Page: 1
End Page: 30

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