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We discuss the 750 GeV diphoton excess at the LHC@13TeV in the framework ofleptophobic U(1)$^\prime$ model inspired by $E_6$ grand unified theory (GUT).In this model, the Standard Model (SM) chiral fermions carry charges underextra U(1)$^\prime$ gauge symmetry which is spontaneously broken by aU(1)$^\prime$-charged singlet scalar ($\Phi$). In addition, extra quarks andleptons are introduced to achieve the anomaly-free conditions, which is anatural consequence of the assumed $E_6$ GUT. These new fermions are vectorlikeunder the SM gauge group but chiral under new U(1)$^\prime$, and their massescome entirely from the nonzero vacuum expectation value of $\Phi$ through theYukawa interactions. Then, the CP-even scalar $h_\Phi$ from $\Phi$ can beproduced at the LHC by the gluon fusion and decay to the diphoton via theone-loop diagram involving the extra quarks and leptons, and can be identifiedas the origin of diphoton excess at 750 GeV. In this model, $h_\Phi$ can decayinto a pair of dark matter particles as well as a pair of scalar bosons,thereby a few tens of the decay width may be possible.

Diphoton Excess at 750 GeV in leptophobic U(1)$^\prime$ model inspired by $E_6$ GUT