First lattice calculation of radiative leptonic decay rates of pseudoscalar mesons

A. Desiderio, R. Frezzotti, M. Garofalo +8

We present a non-perturbative lattice calculation of the form factors which contribute to the amplitudes for the radiative decays $P\to \ell {\bar{\nu }}_{\ell }\gamma$, where $P$ is a pseudosc…