Effects of the restoration of U$_A$(1) symmetry on pseudoscalar meson observables

Details Effects of the restoration of U$_A$(1) symmetry on pseudoscalar meson observables Effects of the restoration of U$_A$(1) symmetry on pseudoscalar meson observables

2005-11-25

arxiv.org/abs/hep-ph/0511284v1

PoS(HEP2005)109

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure. Contribution to Proc. Int. Europhysics Conf. on High Energy Physics (HEP2005), 21-27.7.2005, Lisboa, Portug

Scientific paper

We investigate the restoration of chiral SU$(3)\otimes$SU$(3)$ and axial U$_A$(1) symmetries, at finite temperature and density, in the framework of the three flavor Nambu-Jona-Lasinio model with anomaly. We implement a temperature (density) dependence of the anomaly coefficient motivated by lattice results for the topological susceptibility and we discuss the restoration of symmetries by analyzing the behavior of the mesonic chiral partners and of the mixing angles. The results indicate that the axial part of the symmetry is restored before the possible restoration of the full U(3)$\otimes$U(3) chiral symmetry can occur.

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