Phenomenology of light sterile neutrinos: a brief review

Abstract

An increasing number of anomalous experimental results are emerging, which cannot be described within the standard 3-neutrino framework. We present a concise discussion of the most popular phenomenological interpretation of such findings, based on a hypothetical flavor conversion phenomenon of the ordinary "active" neutrinos into new light "sterile" species having mass m ~ O(1) eV.

Comments: 12 pages, 5 figures, invited review for MPLA, added references, matches published version