Improved description of di-lepton production in ${\tau }^{-}\to {\nu }_{\tau }{P}^{-}$ decays

Adolfo Guevara, Gabriel López Castro, Pablo Roig

Recently, the Belle collaboration reported the first measurements of the ${\tau }^{-}\to {\nu }_{\tau }{\pi }^{-}{e}^{+}{e}^{-}$ branching fraction and the spectrum of the pion-dielectron system. In an analysis pre…