Virtual Photon Emission in Leptonic Decays of Pseudoscalar Mesons

R. Frezzotti, G. Gagliardi, V. Lubicz +6

We present a preliminary non-perturbative lattice calculation of the form factors entering the processes $K\to \ell {\nu }_{\ell }{\ell }^{\prime +}{\ell }^{\prime -}$ and of the corresponding branching ra…