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Hyperons in thermal QCD: A lattice view
,
Chris Allton ,
Davide De Boni,
Benjamin Jäger
Physical Review D, Volume: 99, Issue: 7
Swansea University Authors:
Gert Aarts , Chris Allton
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DOI (Published version): 10.1103/PhysRevD.99.074503
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...
| Published in: | Physical Review D |
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| ISSN: | 2470-0010 2470-0029 |
| Published: |
2019
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| Online Access: |
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| 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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
7 |