Rare kaon decays $K^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }{\ell }^{\prime +}{\ell }^{\prime -}$: Standard Model predictions from lattice QCD

R. Di Palma, R. Frezzotti, G. Gagliardi +6

Weak decays of charged kaons with an additional lepton-antilepton pair, $K^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }{\ell }^{\prime +}{\ell }^{\prime -}$ ($K_{\ell 2{\ell }^{\prime }}$), are suppressed at order $O(G_{F}^{2}α_{\…