Simple Model for (3+2) Neutrino Oscillations

Abstract

We formulate a set of naturalness criteria for sterile neutrinos (ν') to be light, needed for reconciling the LSND neutrino anomaly with the other neutrino data. A light sterile neutrino becomes as natural as the light active neutrinos if it carries quantum numbers of a chiral gauge symmetry broken at the TeV scale. The simplest such theory is shown to be an SU(2) gauge theory with the ν' transforming as a spin 3/2 multiplet. We develop this model and show that it leads naturally to the phenomenologically viable (3+2) neutrino oscillation scheme. We also present next-to-minimal models for light sterile neutrinos based on a chiral U(1) gauge symmetry.

12 pages in LaTeX, typos corrected, reference added

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• Exotic Charges, Multicomponent Dark Matter and Light Sterile Neutrinos
• MiniBooNE Results and Neutrino Schemes with 2 sterile Neutrinos: Possible Mass Orderings and Observables related to Neutrino Masses
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• Neutrino Self-Interactions
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