Search for a heavy neutrino in $\tau$ decays at Belle

Belle Collaboration, D. Liventsev, I. Adachi +189

We report on a search for a heavy neutrino in the decays ${\tau }^{-}\to {\pi }^{-}{\nu }_h$, ${\nu }_h\to {\pi }^{\pm }\ell -+$, $\ell =e,\mu$. The results are obtained using the full data sample collected wit…