New Insight about the Effective Restoration of U_A(1) Symmetry

Abstract

The effective restoration of the U_{A}(1) symmetry is revisited by implementing the functional renormalization group approach combining with the 2+1 flavor Polyakov-loop quark-meson model. A temperature-dependent 't Hooft term is taken to imitate the restoration of the U_{A}(1) symmetry. Order parameters, meson spectrum and mixing angles, especially the pressure and the entropy density of the system are calculated to explore the effects of different U_{A}(1) symmetry restoration patterns. We show then that the temperature for the restoration of the U_{A}(1) symmetry is much higher than that for the chiral symmetry SU_{A}(3).

arXiv comment7 pages, 10 figures, References added

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Cited by in corpus (8)

• QCD at finite temperature and density within the fRG approach: An overview
• Thermal behavior of effective U_A(1) anomaly couplings in reflection of higher topological sectors
• Mass-dependence of pseudocritical temperature in mean field approximation
• $U_A(1)$ symmetry breaking quark interactions from vacuum polarization
• $U_A(1)$ symmetry restoration at high baryon density
• Charged pions asymmetry from the decay of light neutral axial mesons due to interference
• Backreaction of mesonic fluctuations on the axial anomaly at finite temperature
• Probing the chiral and $U(1)$ axial symmetry restoration via meson susceptibilities in holographic QCD