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    Light baryons below and above the deconfinement transition: medium effects and parity doubling


    Aarts, Gert and Allton, Chris and De Boni, Davide and Hands, Simon and Jager, Benjamin and Praki, Chrisanthi and Skullerud, Jon-Ivar (2017) Light baryons below and above the deconfinement transition: medium effects and parity doubling. Journal of High Energy Physics, 2017 (34). ISSN 1029-8479

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    Abstract

    We study what happens to the N , Δ and Ω baryons in the hadronic gas and the quark-gluon plasma, with particular interest in parity doubling and its emergence as the plasma is heated. This is done using simulations of lattice QCD, employing the FASTSUM anisotropic N f = 2 + 1 ensembles, with four temperatures below and four above the deconfinement transition temperature. Below T c we find that the positive-parity groundstate masses are largely temperature independent, whereas the negative-parity ones are reduced considerably as the temperature increases. This may be of interest for heavy-ion phenomenology. Close to the transition, the masses are nearly degenerate, in line with the expectation from chiral symmetry restoration. Above T c we find a clear signal of parity doubling in all three channels, with the effect of the heavier s quark visible.

    Item Type: Article
    Keywords: Lattice Quantum Field Theory; Phase Diagram of QCD; Quark-Gluon Plasma; Thermal Field Theory;
    Academic Unit: Faculty of Science and Engineering > Theoretical Physics
    Item ID: 11790
    Identification Number: https://doi.org/10.1007/JHEP06(2017)034
    Depositing User: Dr. Jonivar Skullerud
    Date Deposited: 21 Nov 2019 15:15
    Journal or Publication Title: Journal of High Energy Physics
    Publisher: Springer Verlag
    Refereed: Yes
    URI:

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