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

TL;DR

This paper proposes that a new QCD-like bound state, called ${ m Q}$-onium, could explain the 750 GeV di-photon excess observed at the LHC, predicting additional detectable resonances.

Contribution

It introduces a novel ${ m Q}$-onium model with specific predictions for new resonances and explains the large width of the excess via excited state production.

Findings

Predicts nearly degenerate colored scalars and spin-1 resonances within LHC reach.

Explains large width as due to excited state production with small mass splitting.

Provides a QCD-like framework for the 750 GeV di-photon excess.

Abstract

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 $J/\Psi$ 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 $\Delta m\sim \Gamma$.