BSM Matter providing Neutrino Masses and Gauge Unification

Understand

I present several scenarios developed in Zagreb, in which TeV-scale particles belonging to non-trivial weak-isospin multiplets give rise to neutrino-mass mechanisms different from conventional type I, II and III seesaw models.

• Two dim 9 tree-level mechanisms, presented first, provide an appealing testability of their exotic TeV-scale particles at the LHC.
• These models are not genuine, since their particles also provide competing dim 5 loop contributions.
• The loop-models presented next are genuine, without competing tree-level contributions.