Resonances from QCD bound states and the 750 GeV diphoton excess

Understand

Pair production of colored particles is in general accompanied by production of QCD bound states (onia) slightly below the pair-production threshold.

• Bound state annihilation leads to resonant signals, which in some cases are easier to see than the decays of the pair-produced constituents.
• In a previous paper (arXiv:1204.1119) we estimated the bound state signals, at leading order and in the Coulomb approximation, for particles with various spins, color representations and electric charges, and used 7 TeV ATLAS and CMS resonance searches to set rough limits.
• Here we update our results to include 8 and 13 TeV data.