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

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

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Abstract

We study what happens to the Nucleon, Delta and Omega 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 Nf=2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature. Below Tc 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 Tc we find a clear signal of parity doubling in all three channels, with the effect of the heavier s quark visible.
Original languageEnglish
JournalJournal of High Energy Physics (JHEP)
Volume2017
Issue number34
ISSN1126-6708
DOIs
Publication statusPublished - 27. Mar 2017

Bibliographical note

33 pages, several figures; additional evidence on the absence of light baryonic bound states in the QGP provided, references added, to appear in JHEP

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