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We study the disintegration $\tau^- \to \pi^-\ell^+\ell^-\nu_\tau$, where $l$denotes either an electron or a muon. This process requires knowledge about the$W^*\gamma^*\pi$ interaction, which is modeled using Resonance Chiral Theory.Within this framework we study the sensitivity of the observables of theprocess, such as the branching ratios and the dilepton mass spectra, to themodel dependent contributions. The information of the hadronization of thequark currents is encoded in form factors which are evaluated using thelightest vector and axial-vector multiplets as degrees of freedom. We determinethe couplings by matching the asymptotic QCD behavior of the form factors inthe limit of an infinite number of colours. The branching ratios we obtain showthat the process with $l=e$ should be measured soon in $B$ factories.

$W^*\gamma^*\pi$ form factors in the $\tau^- \to \pi^-\ell^+\ell^- \nu_{\tau}$ decays

$W^\gamma^\pi$ form factors in the $\tau^- \to \pi^-\ell^+\ell^- \nu_{\tau}$ decays