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


    Aarts, Gert and Allton, Chris and De Boni, Davide and Hands, Simon and Jager, Benjamin and Praki, Chrisanthi and Skullerud, Jon-Ivar (2018) Medium effects and parity doubling of hyperons across the deconfinement phase transition. EPJ Web of Conferences, 175 (07016). ISSN 2100-014X

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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.

    Item Type: Article
    Additional Information: © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/). Presented at 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spain
    Keywords: Medium effects; parity doubling; hyperons; deconfinement phase transition;
    Academic Unit: Faculty of Science and Engineering > Theoretical Physics
    Item ID: 13325
    Identification Number: https://doi.org/10.1051/epjconf/201817507016
    Depositing User: Dr. Jonivar Skullerud
    Date Deposited: 30 Sep 2020 13:52
    Journal or Publication Title: EPJ Web of Conferences
    Publisher: EDP Sciences
    Refereed: Yes
    URI:

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