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

Aarts, Gert ; Allton, Chris ; De Boni, Davide ; Hands, Simon ; Praki, Chrisanthi ; Jäger, Benjamin ; Skullerud, Jon-Ivar Brambilla, N. ; Foka, Y. ; Kovalenko, V.

EPJ Web of Conferences, 2017, Vol.137, p.7004 [Periódico revisado por pares]

Les Ulis: EDP Sciences

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  • Título:
    Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
  • Autor: Aarts, Gert ; Allton, Chris ; De Boni, Davide ; Hands, Simon ; Praki, Chrisanthi ; Jäger, Benjamin ; Skullerud, Jon-Ivar
  • Brambilla, N. ; Foka, Y. ; Kovalenko, V.
  • Assuntos: Baryons ; Channels ; Correlation analysis ; Maximum entropy method ; Parity ; Phase transitions ; Quantum chromodynamics ; Quark-gluon plasma ; Quarks ; Symmetry
  • É parte de: EPJ Web of Conferences, 2017, Vol.137, p.7004
  • Descrição: 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.
  • Editor: Les Ulis: EDP Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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