Composite Higgs and unification
Higgs compositeness is an attractive possibility for making the electroweak scale natural, and together with partial fermion compositeness may explain the observed quark flavour patterns. In this talk I revisit composite Higgs models from the perspective of gauge coupling unification as well as quark-lepton unification, and the conditions on symmetries and fermion partner embeddings following from either requirement. I describe a minimal pNGB Higgs model based on SO(11)/SO(10) which - unlike some unified models in the literature - preserves gauge coupling unification. The model incorporates a conserved baryon number, custodial protection for the T-parameter and the Zbb coupling, and achieves a viable EWPT and LHC phenomenology with a lowish symmetry-breaking scale f ~ 1.5 TeV. Requiring these features essentially fixes the fermion embedding. The model automatically features a vector leptoquark of the sort hinted at by the B-physics.
Zoom link: IPPP Seminars (Thursday at 2 pm UK time)
Meeting ID: 994 2012 4988