Squarkonium, diquarkonium and octetonium at the LHC and their di-photon decays

Understand

Motivated by the recent di-photon excess by both ATLAS and CMS collaborations at the LHC, we systematically investigate the production and di-photon decay of onia formed by pair of all possible color exotic scalars in minimal extension.

• When such scalar massive meta-stable colored and charged (MMCC) particles are produced in pair near threshold, $\eta$ onium can be formed and decay into di-photon through annihilation as $pp\to \eta \to \gamma\gamma$.
• Squarkonium is formed by meta-stable squarks in supersymmetric models such as stoponium.
• Diquarkonium is formed by meta-stable color sextet diquarks which may be realized in the Pati-Salam model.