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.

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

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• The Reactor Antineutrino Anomaly
• Cosmology seeking friendship with sterile neutrinos
• A robust upper limit on N_eff from BBN, circa 2011
• Dual baseline search for muon antineutrino disappearance at 0.1 eV^2 < Δm^2 < 100 eV^2
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