An Anomalous Composite Higgs and the Di-Gamma Resonance

by Ben Gripaios (University of Cambridge (GB))

Friday 3 Jun 2016, 14:00 → 15:00 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

We describe a composite Higgs model in which the SO(5)/SO(4) coset structure of the minimal model is extended by an additional, non-linearly-realized U(1). We show that the extra pseudo-Goldstone boson can play the role of the putative 750 GeV resonance observed at the LHC, with a di-gluon production mode and a di-gamma decay mode arising via anomalies. While some tuning is needed to accommodate flavour and electroweak precision constraints, the model is no worse than the minimal model in this regard. We discuss the higher-order structure of the anomalous effective action and show that there is a possible Wess-Zumino-Witten term that gives rise to an exotic decay of the singlet into hWW Z