# Constraints on a sub-eV scale sterile neutrino from non-oscillation measurements

C. S. Kim, G. López Castro, Dibyakrupa Sahoo

Research output: Contribution to journalArticlepeer-review

## Abstract

Anomalies in several short-baseline neutrino oscillation experiments suggest the possible existence of sterile neutrinos at about eV scale having appreciable mixing with the already known three neutrinos. We find that if such a light sterile neutrino exists, through a combined study of the leptonic decays of μ-, τ-, π-and K-, some semi-leptonic decays of τ-and the invisible decay width of the Z boson, it is possible to constrain the relevant mixing matrix elements. Furthermore, we compare the constraints, derived by using the method presented here, with the experimental results obtained from short-baseline neutrino oscillation experiments. We find that a single light sterile neutrino cannot satisfy the existing short-baseline neutrino oscillation constraints and explain the anomalies mentioned above. Along the way we provide a number of experimentally clean observables which can be used to directly study the light sterile neutrino independently of the neutrino oscillation experiments.

Original language English Unknown Journal Published - 2018 Sep 6

• General