Search for lepton-flavor-violating ${\tau }^{-}\to {\mu }^{-}{\mu }^{+}{\mu }^{-}$ decays at Belle II

Belle II Collaboration, I. Adachi, L. Aggarwal +429

We present the result of a search for the charged-lepton-flavor violating decay ${\tau }^{-}\to {\mu }^{-}{\mu }^{+}{\mu }^{-}$ using a $424f{b}^{-1}$ sample of data recorded by the Belle II experiment at the S…