Search for Lepton-Flavor-Violating $\tau$ Decays to a Lepton and an Invisible Boson at Belle II

Belle II Collaboration, I. Adachi, K. Adamczyk +398

We search for lepton-flavor-violating ${\tau }^{-}\to e^{-}\alpha$ and ${\tau }^{-}\to {\mu }^{-}\alpha$ decays, where $\alpha$ is an invisible spin-0 boson. The search uses electron-positron collisions at $10.58$ GeV cen…