LHC diphoton resonance at $$750\,\text {GeV}$$ 750 GeV as an indication of $$SU(3)_L\times U(1)_X$$ S U ( 3 ) L × U ( 1 ) X electroweak 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 $$\phi $$ of the scalar triplet $$ \Phi $$ of the $$SU(3)_{c}\times SU(3)_{L}\times U(1)_{X}$$ $$(3{-}3{-} 1)$$ 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 $$\phi $$ with 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 $$3{ -}3{-}1$$ gauge group.