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Atmospheric neutrinos, ν<sub>e</sub>-v<sub>s</sub> oscillations, and a novel neutrino evolution equation

By E. Akhmedov

Abstract

If a sterile neutrino nu_s with an eV-scale mass and a sizeable mixing to the electron neutrino exists, as indicated by the reactor and gallium neutrino anomalies, a strong resonance enhancement of nu_e-nu_s oscillations of atmospheric neutrinos should occur in the TeV energy range. At these energies neutrino flavour transitions in the 3+1 scheme depend on just one neutrino mass squared difference and are fully described within a 3-flavour oscillation framework. We demonstrate that the flavour transitions of atmospheric nu_e can actually be very accurately described in a 2-flavour framework, with neutrino flavour evolution governed by an inhomogeneous Schroedinger-like equation. Evolution equations of this type have not been previously considered in the theory of neutrino oscillations

Year: 2016
DOI identifier: 10.1007/JHEP08(2016)153
OAI identifier: oai:escidoc.org:escidoc:2346481
Provided by: MPG.PuRe
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