Triplet Higgs boson collider phenomenology after the LHC

Understand

ATLAS and CMS have discovered a Standard Model Higgs-like particle.

• One of the main discovery channels is the Higgs decay to two photons, which, at the moment, seems to be considerably enhanced over the Standard Model expectation.
• Models with additional charged matter coupling to the Higgs sector can enhance or decrease the Higgs to two photons branching ratio.
• We take this as motivation to confront the so-called Georgi-Machacek model of Higgs triplets with the results of recent searches for a SM Higgs boson performed at the LHC.