Minimal Radiative Neutrino Masses

Understand

We conduct a systematic search for neutrino mass models which only radiatively produce the dimension-5 Weinberg operator.

• We thereby do not allow for additional symmetries beyond the Standard Model gauge symmetry and we restrict ourselves to minimal models.
• We also include stable fractionally charged and coloured particles in our search.
• Additionally, we proof that there is a unique model with three new fermionic representations where no new scalars are required to generate neutrino masses at loop level.