Abstract
We study five-body leptonic decays τ−→l−l′+l′−ντν‾l(l,l′=e,μ) with the world largest data sample, containing about 0.91×109τ+τ− pairs, collected at Belle. Precision measurement of the branching fractions of these decays allows one to constrain Michel parameters, i.e., perform an extended test of the Lorentz structure of the charged weak interaction. Based on the recently published analytical formalism for the total differential decay width, Monte Carlo event generator has been developed within TAUOLA program. We report the first results on the sensitivity to the τ five-body leptonic decays at Belle.
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