Proposed search for a nu_tau-mixing heavy neutrino

Sumitted to PubDB: 2019-08-15

Category: Talk, Visibility: Public

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Authors	Minakshi Nayak
Date	July 18, 2019
Belle II Number	BELLE2-TALK-CONF-2019-098
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.
Conference	Anomalies 2019