Minimal scoto-seesaw mechanism with spontaneous CP violation

Abstract

We propose simple scoto-seesaw models to account for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal ${\mathcal{Z}}_8$ discrete symmetry, broken to a residual ${\mathcal{Z}}_2$ subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed ${\mathcal{Z}}_8$ symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments, so that normal-ordered neutrino masses can be cornered by cosmological observations and neutrinoless double beta decay experiments.

15 pages, 8 Figures

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