On the short-distance constraints from K_{L,S} -> mu^+ mu^-

Gino Isidori, Rene Unterdorfer

Motivated by new precise results on several $K_L$ decays, sensitive to the $K_L\to \gamma \gamma$ form factor, we present a new analysis of the $K_L\to {\mu }^{+}{\mu }^{-}$ long-distance amplitude base…