The Low-Scale Approach to Neutrino Masses

Table 1

Phenomenological implications of low-scale seesaw models together with their particle content.

Model	Scalars	Fermions	LFV	LHC
Type-I			✗	✗
Type-II			✓	✓
Type-III			✗	✓
Inverse			✓	✗
Linear			✓	✗
Inverse type-III			✓	✓

The subscript in the representations is lepton number. “✗” would change to “✓” in the presence of new gauge bosons or supersymmetry, as explained in the text.