Search for lepton-flavor-violating tau decays to $\ell \alpha$ at Belle

Belle Collaboration, K. Uno, K. Hayasaka +123

We report a search for the lepton-flavor-violating decays ${\tau }^{\pm }\to {\ell }^{\pm }\alpha$~($\ell =e,\mu$), where $\alpha$ is an undetected spin-0 particle, such as an axion-like particle using $73…