TL;DR
This paper introduces a Stealth Doublet Model with two scalar doublets, explaining unique Higgs phenomenology, including a light charged scalar and potential enhancement of the Higgs to gamma gamma signal at 125 GeV.
Contribution
The paper proposes a novel two-doublet Higgs model with a softly broken Z2 symmetry, leading to distinctive phenomenology and potential explanations for LHC Higgs observations.
Findings
Light charged scalar H^\pm decays into W \gamma
Model reproduces enhanced \\gamma \\gamma signal at 125 GeV
Mixing between doublets affects Higgs phenomenology
Abstract
I present a model with two scalar doublets and a softly broken symmetry, where only one of the doublets gets a vacuum expectation value and couples to fermions at tree-level. The softly broken symmetry leads to interesting phenomenology such as mixing between the two doublets and a charged scalar H^\pm which can be light and dominantly decays into W \gamma. The model can also naturally reproduce an enhanced \gamma \gamma signal of the newly observed Higgs boson at the LHC with mass 125 GeV.
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