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    Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition


    Aarts, Gert and Allton, Chris and De Boni, Davide and Hands, Simon and Praki, Chrisanthi and Jager, Benjamin and Skullerud, Jon-Ivar (2017) Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition. EPJ Web of Conferences, 137. 07004. ISSN 2100-014X

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    Abstract

    In this work we analyse positive- and negative-parity channels for the nucleón (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral symmetry is spontaneously broken, causing positive- and negative-parity ground states to have different masses. However, chiral symmetry is expected to be restored (for massless quarks) around the crossover temperature, implying that the two opposite parity channels should become degenerate. Here we study what happens in a temperature range which includes both the hadronic and the quark gluon plasma (QGP) phase. By analysing the correlation and spectral functions via exponential fits and the Maximum Entropy Method respectively, we have found parity doubling for the nucleon and Δ baryon channels in the QGP phase. For the Ω baryon we see a clear signal of parity doubling at the crossover temperature, which is however not complete, due to the nonzero strange quark mass. Moreover, in-medium effects in the hadronic phase are evident for all three baryons, in particular for the negative-parity ground states. This might have implications for the hadron resonance gas model. In this work we used the FASTSUM anisotropic Nf = 2 + 1 ensembles.

    Item Type: Article
    Additional Information: This paper was presented at the XIIth Quark Confinement and the Hadron Spectrum, 29 Aug - 3 Sep 2016, Thessaloniki, Greece.
    Keywords: Correlation analysis; Quarks; Phase transitions; Maximum entropy method; Maximum entropy; Parity; Baryons; Channels; Quantum chromodynamics; Symmetry;
    Academic Unit: Faculty of Science and Engineering > Theoretical Physics
    Item ID: 12067
    Identification Number: https://doi.org/10.1051/epjconf/201713707004
    Depositing User: Dr. Jonivar Skullerud
    Date Deposited: 02 Jan 2020 14:32
    Journal or Publication Title: EPJ Web of Conferences
    Publisher: EDP Sciences
    Refereed: Yes
    URI:

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