Radiative neutrino masses from order-4 CP symmetry

Understand

Generalized CP symmetry of order 4 (CP4) is surprisingly powerful in shaping scalar and quark sectors of multi-Higgs models.

• Here, we extend this framework to the neutrino sector.
• We build two simple Majorana neutrino mass models with unbroken CP4, which are analogous to Ma's scotogenic model.
• Both models use three Higgs doublets and two or three right-handed (RH) neutrinos.