Updated study of the $\eta$-${\eta }^{\prime }$ mixing and the thermal properties of light pseudoscalar mesons at low temperatures

Xiao-Wei Gu, Chun-Gui Duan, Zhi-Hui Guo

Within the framework of the $U(3)$ chiral perturbation theory, we revisit the masses, decay constants and the mixing parameters of the light pseudoscalar mesons $\pi ,K,\eta$ and ${\eta }^{\prime }$.…