Diboson Resonance as a Portal to Hidden Strong Dynamics

Understand

We propose a new explanation for excess events observed in the search for a high-mass resonance decaying into dibosons by the ATLAS experiment.

• The resonance is identified as a composite spin-$0$ particle that couples to the Standard Model gauge bosons via dimension-5 operators.
• The excess events can be explained if the dimension-5 operators are suppressed by a mass scale of ${\cal O}(1$-$10$) TeV.
• We also construct a model of hidden strong gauge dynamics which realizes the spin-$0$ particle as its lightest composite state, with appropriate couplings to Standard Model gauge bosons.