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The LHC collaborations ATLAS and CMS recently reported on the excess of theevents in the diphoton final states at the invariant mass of about $750~\text{GeV}$. In this article we speculate on the possibility that the excessarises from the neutral CP-even component $\phi$ 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 vacuumexpectation value larger than the electroweak symmetry breaking scale. Theinteractions of the scalar field $\phi$ to the photon- and gluon-pairs aremediated by the virtual vector-like fermions which appear as components of theanomaly-free chiral fermion representations of the $3\text{ -}3\text{-}1$ gaugegroup.

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