ArgoNeuT was a 0.24 ton Liquid Argon Time Projection Chamber (LArTPC) detector at Fermilab running from 2009 to 2010. It was located along the NuMI neutrino beam and collected six months of data in anti-neutrino beam mode. ArgoNeuT has performed several first neutrino cross-section measurements on argon, however its dataset can also be used to probe physics beyond the Standard Model. One such model is Heavy Neutral Leptons (HNL) that couple to the standard model via mixing with tau neutrinos. These would be produced by the NuMI beam via decays of D-mesons into secondary taus, which then decay into HNLs. The HNLs then travel along the NuMI beamline and can decay into an active neutrino and a muon and anti-muon pair either within ArgoNeuT or in the cavern upstream of the detector. This talk presents a search for such HNLs with ArgoNeuT and the resulting new constraints on the HNL mass and mixing angles.
|Reference to paper (DOI or arXiv)||arXiv:2106.13684 [hep-ex]|