A single keV sterile neutrino in the minimal extended seesaw with A4 flavor symmetry is scanned against 0νββ, dark matter, and leptogenesis constraints, and the normal neutrino mass ordering emerges as favored.
Quasi Goldstone Fermion As a Sterile Neutrino
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abstract
The existence of sterile neutrino is hinted by simultaneous explanation of diverse neutrino anomalies. We suggest that the quasi Goldstone fermions (QGF) arising in supersymmetric theory as a result of spontaneous breaking of global symmetry like the Peccei-Quinn symmetry or the lepton number symmetry can play a role of the sterile neutrino. The smallness of mass of QGF ($m_S \sim 10^{-3}-10$ eV) can be related to the specific choice of superpotential or K\"ahler potential (e.g., no-scale kinetic terms for certain superfields). Mixing of QGF with neutrinos implies the $R$-parity violation. It can proceed via the coupling of QGF with the Higgs supermultiplets or directly with the lepton doublet. A model which accounts for the solar and atmospheric anomalies and the dark matter is presented.
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Phenomenology of $keV$ sterile neutrino in minimal extended seesaw
A single keV sterile neutrino in the minimal extended seesaw with A4 flavor symmetry is scanned against 0νββ, dark matter, and leptogenesis constraints, and the normal neutrino mass ordering emerges as favored.