Parity doubling of nucleons and Delta baryons across the deconfinement phase transition

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

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At zero temperature the negative-parity ground states of the nucleon and delta baryons are non-degenerate with the positive-parity partners due to spontaneous breaking of chiral symmetry. However, chiral symmetry is expected to be restored at sufficiently high temperature, in particular when going from the hadronic to the quark-gluon plasma (QGP) phase. This would imply that channels with opposite parity become degenerate. We study the nucleon (spin $1/2$) and $\Delta$ (spin $3/2$) baryons in both parity sectors using lattice QCD. The range of temperatures spans both the hadronic and QGP phases. Using the FASTSUM anisotropic $N_f = 2 + 1$ ensembles, we analyze the correlation functions and the spectral functions using respectively exponential fits and the Maximum Entropy Method. We find clear evidence of in-medium effects in the hadronic phase, especially for the negative-parity ground state, and of parity doubling in the QGP phase.
Original languageEnglish
JournalP o S - Proceedings of Science
Publication statusPublished - 24. Oct 2016
Externally publishedYes

Bibliographical note

7 pages, 3 figures. Talk presented at the 34th International Symposium on Lattice Field Theory (Lattice 2016), 24-30 July 2016, Southampton, UK


  • hep-lat

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