Gluon-Photon Signatures for color octet at the LHC (and beyond)

Understand

We consider a color octet scalar particle and its exotic decay in the channel gluon-$\gamma$ using an effective Lagrangian description for its strong and electromagnetic interactions.

• Such a state is present in many extensions of the Standard Model, and in particular in composite Higgs models with top partial compositeness, where couplings to photons arise via the Wess-Zumino-Witten term.
• We find that final states with one or two photons allow for a better reach at the LHC, even for small branching ratios.
• Masses up to $1.2$ TeV can be probed at the HL-LHC by use of all final states.