Leptonic decays of the tau lepton

Abstract

In these proceedings we review the SM prediction for the tau leptonic decays, including the radiative (τ→ℓλνν¯)$ (\tau \to \ell \lambda \nu \bar \nu ) $ and the five-body (τ→ℓℓ′ℓ′νν¯)$ (\tau \to \ell \ell '\ell '\nu \bar \nu ) $ decay modes, which are among the most powerful tools to study precisely the structure of the weak interaction and to constrain possible contributions beyond the V–A coupling of the Standard Model.