Lepton flavor violation and scalar dark matter in a radiative model of neutrino masses

摘要

We consider a simple extension of the Standard Model that can account for thedark matter and explain the existence of neutrino masses. The model includes avector-like doublet of SU(2), a singlet fermion, and two scalar singlets, allof them odd under a new Z$_2$ symmetry. Neutrino masses are generatedradiatively by one-loop processes involving the new fields, while the darkmatter candidate is the lightest neutral particle among them. We focusspecifically on the case where the dark matter particle is one of the scalarsand its relic density is determined by its Yukawa interactions. Thephenomenology of this setup, including neutrino masses, dark matter and leptonflavor violation, is analyzed in some detail. We find that the dark matter massmust be below $500$ GeV to satisfy the relic density constraint. Lepton flavorviolating processes are shown to provide the most promising way to test thisscenario. Future $\mu\to 3e$ and $\mu$-$e$ conversion experiments, inparticular, have the potential to probe the entire viable parameter space ofthis model.