A quasi-Dirac pair of Heavy Neutral Leptons possesses a number of features that make it an appealing target for search in the GeV mass scale at future collider experiments. This scenario is studied in the Left-Right Symmetric Model. Predictions for the HNL couplings to different lepton flavors are derived, and the possible probes of the model based on the LNV signature are considered.
An investigation of relatively light (GeV-scale), long-lived right-handed neutrinos is performed within minimal left-right symmetric models using the neutrino-extended Standard Model Effective Field Theory framework. Light sterile neutrinos can be produced through rare decays of kaons, $D$-mesons, and $B$-mesons at the Large Hadron Collider (LHC) and the Long-Baseline Neutrino Facility (LBNF)...
