Minakshi Nayak

18 July 2019
Anomalies 2019

Abstract: Addition of right-handed neutrinos to the standard model can explain neutrino oscillations, dark matter, and the baryon asymmetry of the universe. The resulting mass-eigenstate "heavy neutral lepton” (HNL) may be produced at accelerators and may be long-lived, depending on the strength of its mixing with the standard-model neutrino. High-luminosity e+e- B factories produce large numbers of tau-lepton pairs, yielding the best sensitivity for an HNL that mixes primarily with the tau neutrino and has a mass below that of the tau lepton. I will report the first study of this type, showing how to use kinematic constraints to obtain the mass of the long-lived HNL despite the missing neutrino in the final state. Sensitivity projections for existing B factories and for Belle II will be shown.