## Revisiting the flavor violating decays of the Tau and Mu leptons in the Standard Model with massive neutrinos

Gerardo Hernández Tomé

SciPost Phys. Proc. 1, 017 (2019) · published 19 February 2019

### Proceedings event

The 15th International Workshop on Tau Lepton Physics

### Abstract

The flavor violating leptonic decays of the $\tau$ and $\mu$ leptons into three lighter charged leptons are revisited in the framework the Standard Model with massive neutrinos. In contrast to the previous prediction, we have found strongly suppressed rates for the $\tau^-\to \mu^- \ell^+ \ell^-$ ($\ell=\mu, e$) decays. Our results are in good agreement with the approximation of neglecting masses and momenta of the external particles in the loop integrals made in the first computation for the $\mu^- \to e^-e^+ e^-$ decay.

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