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Parity Doubling in QCD Thermodynamics

Institute of Theoretical Physics, University of Wroclaw, PL-50204 Wroclaw, Poland
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
National Research Nuclear University, 115409 Moscow, Russia
iTHES Research Group, RIKEN, Saitama 351-0198, Japan
Author to whom correspondence should be addressed.
Presented at the 7th International Conference on New Frontiers in Physics (ICNFP 2018), Crete, Greece, 4–12 July 2018.
Proceedings 2019, 13(1), 7;
Published: 24 June 2019
(This article belongs to the Proceedings of The International Conference on New Frontiers in Physics)
PDF [1066 KB, uploaded 24 June 2019]


Motivated by the recent lattice study by FASTSUM collaboration, effective masses of the baryon parity-doublers are shown for various pion masses. A general trend of the nucleon and delta parity-doublers is consistent with the lattice Quantum Chromodynamics (QCD) observation, whereas the hyperon masses exhibit a qualitatively different behavior, traced back to the lattice set-up with the heavy pion comparable to the kaon. As an application to hot QCD, we demonstrate the fluctuations and correlations involving baryon number in hot hadronic matter with modified masses of negative-parity baryons, in the context of the hadron resonance gas. Confronting the baryon number susceptibility, baryon–charge and baryon–strangeness correlations as well as their ratios with the lattice QCD data for the physical pion mass, we find that the strong downward mass shift in the hyperons can accidentally reproduce some correlation ratios, however it also tends to overshoot the individual fluctuations and correlations of lattice simulations. Another application of nucleon parity doubling is the physics of neutron stars. Under beta equilibrium and charge neutrality, hadronic matter with unbroken chiral symmetry can be favored in the core of the neutron stars.
Keywords: parity doubling; chiral symmetry; QCD thermodynamics parity doubling; chiral symmetry; QCD thermodynamics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Sasaki, C.; Blaschke, D.; Lo, P.M.; Marczenko, M.; Morita, K.; Redlich, K. Parity Doubling in QCD Thermodynamics. Proceedings 2019, 13, 7.

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