Heavy Neutral Leptons from low-scale seesaws at the DUNE Near Detector

Understand

Heavy nearly-sterile neutrinos are a common ingredient in extensions of the Standard Model which aim to explain neutrino masses, like for instance in Type I seesaw models, or one of its variants.

• If the scale of the new Heavy Neutral Leptons (HNLs) is sufficiently low, observable signatures can arise in a range of current and upcoming experiments, from the LHC to neutrino experiments.
• In this article, we discuss the phenomenology of sterile neutrinos in the MeV to GeV mass range, focusing on their decays.
• We embed our discussion in a realistic mass model and consider the resulting implications.