Hyperons in thermal QCD

A lattice view

Gert Aarts*, Chris Allton, Davide De Boni, Benjamin Jäger

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Resumé

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.

OriginalsprogEngelsk
Artikelnummer074503
TidsskriftPhysical Review D
Vol/bind99
Udgave nummer7
Antal sider9
ISSN2470-0010
DOI
StatusUdgivet - 1. apr. 2019

Fingeraftryk

hyperons
parity
quantum chromodynamics
gases
ground state
octets
correlators
phenomenology
baryons
heavy ions
quarks
vacuum
temperature dependence
temperature
simulation

Citer dette

Aarts, Gert ; Allton, Chris ; De Boni, Davide ; Jäger, Benjamin. / Hyperons in thermal QCD : A lattice view. I: Physical Review D. 2019 ; Bind 99, Nr. 7.
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Hyperons in thermal QCD : A lattice view. / Aarts, Gert; Allton, Chris; De Boni, Davide; Jäger, Benjamin.

I: Physical Review D, Bind 99, Nr. 7, 074503, 01.04.2019.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Hyperons in thermal QCD

T2 - A lattice view

AU - Aarts, Gert

AU - Allton, Chris

AU - De Boni, Davide

AU - Jäger, Benjamin

PY - 2019/4/1

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N2 - 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.

AB - 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.

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