Neutrino catalyzed diphoton excess

In this paper we explain the 750 GeV diphoton resonance observed at the run-2 LHC as a scalar singlet SS, that plays a key role in generating tiny but nonzero Majorana neutrino masses. The model contains four electroweak singlets: two leptoquarks, a singly charged scalar and a neutral scalar SS. Majorana neutrino masses might be generated at the two-loop level as SS gets nonzero vacuum expectation value. SS can be produced at the LHC through the gluon fusion and decays into diphoton with charged scalars running in the loop. The model fits perfectly with a narrow width of the resonance. Constraints on the model are investigated, which shows a negligible mixing between the resonance and the standard model Higgs boson.