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Medium effects and parity doubling of hyperons across the deconfinement phase transition

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

EPJ Web of Conferences, Volume: 175, Start page: 07016

Swansea University Author: Gert Aarts Orcid Logo

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DOI (Published version): 10.1051/epjconf/201817507016

Abstract

We analyse the behaviour of hyperons with strangeness S=−1,−2,−3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature grows. This study uses our FASTSUM anisotropic Nf=2+1 ensembles, with four temperatures below and four abov...

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Published in: EPJ Web of Conferences
ISSN: 2100-014X
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa37989
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Abstract: We analyse the behaviour of hyperons with strangeness S=−1,−2,−3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature grows. This study uses our FASTSUM anisotropic Nf=2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature, Tc. The positive-parity groundstate masses are found to be largely temperature independent below Tc, whereas the negative-parity ones decrease considerably as the temperature increases. Close to the transition, the masses are almost degenerate, in line with the expectation from chiral symmetry restoration. This may be of interest for heavy-ion phenomenology. In particular we show an application of this effect to the Hadron Resonance Gas model. A clear signal of parity doubling is found above Tc in all hyperon channels, with the strength of the effect depending on the number of s-quarks in the baryons.
College: Faculty of Science and Engineering
Start Page: 07016

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