New constraints on tau-coupled Heavy Neutral Leptons with masses $m_N=280-970$ MeV

ArgoNeuT Collaboration, R. Acciarri, C. Adams +19

A search for Heavy Neutral Leptons has been performed with the ArgoNeuT detector exposed to the NuMI neutrino beam at Fermilab. We search for the decay signature $N\to \nu {\mu }^{+}{\mu }^{-}$,…