Back to 1974: The $\mathcal Q$-onium

We show that the 750 GeV di-photon excess could be explained by the ${\mathcal Q}-$onium system of a new QCD-like theory with fermions vectorial under the SM. Beside the spin-0 di-photon singlet this scenario predicts almost degenerate colored scalars and spin-1 resonances analogous to the $J/Ψ$ in QCD. All these states are within the reach of the LHC. An apparent large width can be explained as due to production of excited states with splitting $Δm\sim Γ$.

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