# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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# Contribution Parallel

Mexico City -
Hadron Decays, Production and Interactions

# Semileptonic tau decays

## Speakers

• Dr. Adolfo GUEVARA

## Abstract

The recent results at Belle of $\mathcal{B}(\tau^-\to\nu_\tau\pi^-\ell\overline{\ell})$, considered the most important background of some possible LFV and LNV processes, has encouraged us to make a reanalysis of these decays. In this work, we use $\chi$PT extended to include resonances, (R$\chi$T) to compute the effective vertex $W^\star\gamma^\star P$ involved in such processes including effects not considered in previous analyses. The first ever prediction with $K$ instead of $\pi^-$ is given.