750 GeV Diphoton excess from Gauged $B-L$ Symmetry

TL;DR

This paper proposes that the 750 GeV diphoton excess observed at LHC can be explained by a singlet scalar particle with specific B-L charge in an extended Standard Model, which also includes dark matter and neutrino mass features.

Contribution

It introduces a gauged B-L extension of the Standard Model with an unconventional charge assignment that explains the diphoton excess and incorporates dark matter and neutrino mass mechanisms.

Findings

The model accounts for the 750 GeV diphoton excess.

It naturally includes a dark matter candidate.

It provides a mechanism for small neutrino masses.

Abstract

We show that the recently observed 750 GeV diphoton excess at LHC can be due to the decay of a $SU(2)_L$ singlet scalar particle having 3 units of charge under gauged $B - L$ symmetry. Such a particle arises as an essential ingredient of recently studied gauged $B -L$ extension of the Standard Model with unconventional charge assignment for right handed neutrinos. Apart from being one of the simplest extensions of the Standard Model, the model also contains a dark matter candidate and Dirac neutrinos with naturally small masses.