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Hyperons in thermal QCD: A lattice view / Gert, Aarts; Chris, Allton

Physical Review D, Volume: 99, Issue: 7

Swansesa University Authors: Gert, Aarts, Chris, Allton

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Abstract

The hadron resonance gas (HRG) is a widely used description of matter under extreme conditions, e.g., in the context of heavy-ion phenomenology. Commonly used implementations of the HRG employ vacuum hadron masses throughout the hadronic phase and hence do not include possible in-medium effects. Her...

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Published in: Physical Review D
ISSN: 2470-0010 2470-0029
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa48150
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Abstract: The hadron resonance gas (HRG) is a widely used description of matter under extreme conditions, e.g., in the context of heavy-ion phenomenology. Commonly used implementations of the HRG employ vacuum hadron masses throughout the hadronic phase and hence do not include possible in-medium effects. Here we investigate this issue, using nonperturbative lattice simulations employing the FASTSUM anisotropic Nf=2+1 ensembles. We study the fate of octet and decuplet baryons as the temperature increases, focussing in particular on the positive- and negative-parity ground states. While the positive-parity ground state masses are indeed seen to be temperature independent, within the error, a strong temperature dependence is observed in the negative-parity channels. We give a simple parametrization of this and formulate an in-medium HRG, which is particularly effective for hyperons. Parity doubling is seen to emerge in the deconfined phase at the level of correlators, with a noticeable effect of the heavier s quark. Channel dependence of this transition is analyzed.
College: College of Science
Issue: 7