Lepton-pair production in di-pion $\tau$ lepton decays

J. L. Gutiérrez Santiago, G. López Castro, P. Roig

We study the ${\tau }^{-}\to {\nu }_{\tau }{\pi }^{-}{\pi }^0{\ell }^{+}{\ell }^{-}$ ($\ell =e,\mu$) decays, which are $O({\alpha }^2)$-suppressed with respect to the dominant di-pion tau decay channel. Both the inner-br…