Light quark loops in $K^{\pm }\to {\pi }^{\pm }\nu \bar{\nu }$ from vector meson dominance and update on the Kaon Unitarity Triangle

E. Lunghi, A. Soni

We use vector meson dominance to calculate non-perturbative contributions to the branching ratio of the rare decay $K^{\pm }\to {\pi }^{\pm }\nu \bar{\nu }$ stemming from matrix elements involving…