Scrutinizing the $\eta$-$\eta'$ mixing, masses and pseudoscalar decay constants in the $U(3)$ chiral effective field theory framework

31 Xu-Kun Guo Zhi-Hui Guo Juan Jose Sanz-Cillero 2015 Scrutinizing the $\eta$-$\eta'$ mixing, masses and pseudoscalar decay constants in the $U(3)$ chiral effective field theory framework