Light baryons below and above the deconfinement transition: medium effects and parity doubling
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.
Keywords
Cite
@article{arxiv.1703.09246,
title = {Light baryons below and above the deconfinement transition: medium effects and parity doubling},
author = {Gert Aarts and Chris Allton and Davide De Boni and Simon Hands and Benjamin Jäger and Chrisanthi Praki and Jon-Ivar Skullerud},
journal= {arXiv preprint arXiv:1703.09246},
year = {2017}
}
Comments
33 pages, several figures; additional evidence on the absence of light baryonic bound states in the QGP provided, references added, to appear in JHEP