One-loop effects from spin-1 resonances in Composite Higgs models

Understand

We compute the 1-loop correction to the electroweak observables from spin-1 resonances in SO(5)/SO(4) composite Higgs models.

• The strong dynamics is modeled with an effective description comprising the Nambu-Goldstone bosons and the lowest-lying spin-1 resonances.
• A classification is performed of the relevant operators including custodially-breaking effects from the gauging of hypercharge.
• The 1-loop contribution of the resonances is extracted in a diagrammatic approach by matching to the low-energy theory of Nambu-Goldstone bosons.