Enhanced hVV couplings in the Georgi-Machacek model and beyond

Abstract

In this talk I discuss extended Higgs sectors in which the 125 GeV Higgs boson couplings to W and Z bosons can be larger than in the Standard Model. Constraints from perturbative unitarity and the electroweak rho parameter limit the number of possible models to a tractable few. Focusing on generalizations of the Georgi-Machacek model and taking advantage of the custodial symmetry, I show that existing experimental and theoretical constraints can be combined to set an upper limit on the enhancement of the Higgs couplings to W and Z bosons. This talk is based mostly on arXiv:1502.01275.

Comments: 6 pages, 2 figures. Talk given at the 2nd Toyama International Workshop on Higgs as a Probe of New Physics 2015, 11-15 February 2015, Toyama, Japan