Double Higgs boson production in the Standard Model with extra scalar particles

Abstract

Three extensions of the scalar sector of the Standard Model are considered: one extra isosinglet, one extra isotriplet, two extra isotriplets (the Georgi-Machacek model). Double Higgs boson production cross section is calculated in all these extensions. Bounds from electroweak precision observables, signal strength measurements and custodial symmetry violation are estimated.

Comments: 5 pages, 3 figures, presented at the 27th Rencontres de Blois, France, May 31 - 5 June 2015