LHC diphoton 750 GeV resonance as an indication of $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ gauge symmetry

Abstract

The LHC collaborations ATLAS and CMS recently reported on the excess of the events in the diphoton final states at the invariant mass of about $750\text{GeV}$. In this article we speculate on the possibility that the excess arises from the neutral CP-even component $\varphi$ of the scalar triplet $\Phi$ of the $SU(3{)}_c\times SU(3{)}_L\times U(1{)}_X$ $(3\text{-}3\text{-}1)$ model that has a $U(1{)}_X$ charge equal to $X=-1/3$ and acquires a vacuum expectation value larger than the electroweak symmetry breaking scale. The interactions of the scalar field $\varphi$ to the photon- and gluon-pairs are mediated by the virtual vector-like fermions which appear as components of the anomaly-free chiral fermion representations of the $3\text{ -}3\text{-}1$ gauge group.

Comments: 13 pages, 1 figure. Substantially improved version