Neutrino Catalyzed Diphoton Excess

TL;DR

This paper proposes a model where a scalar singlet explains the 750 GeV diphoton resonance at the LHC and simultaneously generates tiny Majorana neutrino masses, involving new electroweak singlets and loop processes.

Contribution

It introduces a novel scalar singlet model linking the diphoton excess with neutrino mass generation, including detailed production and decay mechanisms at the LHC.

Findings

Model fits the observed wide resonance width

Negligible mixing with the standard model Higgs

Consistent with experimental constraints

Abstract

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