Pseudoscalars Mesons in Hot, Dense Matter

Abstract

Phase transitions in hot and dense matter and the in--medium behavior of pseudoscalar mesons (${\pi }^{\pm },{\pi }^0,K^{\pm },K^0,{\bar{K}}^0,\eta and{\eta }^{\prime }$) are investigated, in the framework of the three flavor Nambu--Jona-Lasinio model, including the 't Hooft interaction, which breaks the $U_A(1)$ symmetry. Three different scenarios are considered: zero density and finite temperature, zero temperature and finite density in quark matter with different degrees of strangeness, and finite temperature and density. At T=0, the role of strange valence quarks in the medium is discussed, in connection with the phase transition and the mesonic behavior. It is found that the appearance of strange quarks, above certain densities, leads to meaningful changes in different observables, especially in matter with β$--equilibrium.Thebehaviorofmesonsinthe$T-ρ$ plane is analyzed in connection with possible signatures of restoration of symmetries.

33 pages, 12 figures, PRC version

References in corpus (2)

• Pseudoscalar neutral mesons in hot and dense matter
• Anomalous decay of pion and eta at finite density

Cited by in corpus (4)

• Analysis of U${}_A$(1) symmetry-breaking and restoration effects on the scalar-pseudoscalar spectrum
• Anomalous decay of pion and eta at finite temperature
• Effective restoration of chiral and axial symmetries at finite temperature and density
• Two photon decay of ${\pi }^0$ and $\eta$ at finite temperature and density