Connecting Radiative Neutrino Mass, Neutron-Antineutron Oscillation,   Proton Decay, and Leptogenesis through Dark Matter
  The scotogenic mechanism for radiative neutrino mass is generalized to include neutron-antineutron oscillation as well as proton decay. Dark matter is stabilized by extending the notion of lepton parity to matter parity. Leptogenesis is also a possible byproduct. This framework unifies the description of all these important, but seemingly unrelated, topics in physics beyond the standard model of particle interactions. 
Pei-Hong Gu, Ernest Ma, Utpal Sarkar
hep-ph