An ultraviolet completion for the Scotogenic model

Abstract

The Scotogenic model is an economical scenario that generates neutrino masses at the 1-loop level and includes a dark matter candidate. This is achieved by means of an ad-hoc ${\mathbb{Z}}_2$ symmetry, which forbids the tree-level generation of neutrino masses and stabilizes the lightest ${\mathbb{Z}}_2$-odd state. Neutrino masses are also suppressed by a quartic coupling, usually denoted by ${\lambda }_5$. While the smallness of this parameter is natural, it is not explained in the context of the Scotogenic model. We construct an ultraviolet completion of the Scotogenic model that provides a natural explanation for the smallness of the ${\lambda }_5$ parameter and induces the ${\mathbb{Z}}_2$ parity as the low-energy remnant of a global $\mathrm{U}(1)$ symmetry at high energies. The low-energy spectrum contains, besides the usual Scotogenic states, a massive scalar and a massless Goldstone boson, hence leading to novel phenomenological predictions in flavor observables, dark matter physics and colliders.

arXiv comment12 pages, 3 figures, 1 table; v2: corrected equations (22) and (23), conclusions unchanged

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• Dark matter in the Scotogenic model with spontaneous lepton number violation
• Absolute neutrino mass scale and dark matter stability from flavour symmetry
• Fermionic Dark Matter in Dynamical Scotogenic Model
• Theory and phenomenology of Dirac neutrinos