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We propose that the diphoton resonance signal indicated by the recent LHCdata might also arise from the pair productions of vector-like heavy down-typequarks with mass around $750$ GeV and above. The vector-like quark decays intoan ordinary light quark and a Standard Model singlet scalar. The subsequentdecay of scalar singlet produces the diphoton excess. Both the vector-likequark and singlet scalars appear naturally in the $E_6$, and their masses canbe in the TeV scale with a suitable choice of symmetry breaking pattern. Theprediction of such a proposal would be to see an accompanying dijet signal atthe same mass with similar cross section in the $2\gamma + 2j$ final state andtwo dijet resonances at the same mass for a $4j$ final state with a crosssection, about 100 times larger. Both predictions can be tested easily as theluminosity accumulates in the upcoming runs of the LHC.

A new proposal for diphoton resonance from $E_6$ motivated extra $U(1)$