The LFU Ratio $R_{\pi }$ in the Standard Model and Beyond

Marzia Bordone, Claudia Cornella, Gino Isidori +1

We discuss the possibility of performing precise tests of $\mu /e$ universality in $B\to \pi {\ell }^{+}{\ell }^{-}$ decays. We show that in wide regions of the dilepton invariant mass spectrum th…