The weak radiative pion vertex in τ^- ->π^-ν_τl^+ l^- decays

P. Roig, A. Guevara, G. López Castro

We carry out a detailed study of the branching fractions and lepton pair invariant-mass spectrum of τ^- ->π^- ν_τl^+l^- decays (l=e,μ). In addition to the model-independent (QED) c…