Machine learning unveils the quark mass dependence of the pseudoscalar meson decay constants in three-flavour N${}^2$LO ChPT

Zejian Zhuang, Fernando Gil Domínguez, Raquel Molina

The quark mass dependence of the pseudoscalar meson decay consntants, $f_{\pi },f_K$ and $f_{\eta }$, are determined from three-flavor N${}^2$LO ChPT till pion masses around $780$ MeV, near th…