Radiative $\mu$ and $\tau$ leptonic decays at NLO

M. Fael, L. Mercolli, M. Passera

We present the differential rates and branching ratios of the radiative decays $\tau \to l\bar{\nu }\nu \gamma$, with $l=e$ or $\mu$, and $\mu \to e\bar{\nu }\nu \gamma$ in the Standard Model at next-to-leading…