The Higgs Decay Width in Multi-Scalar Doublet Models

Abstract

We show that there are regions of parameter space in multi-scalar doublet models where, in the first few hundred inverse femtobarns of data, the new charged and neutral scalars are not directly observable at the LHC and yet the Higgs decay rate to b bbar is changed significantly from its standard model value. For a light Higgs with a mass less than 140 GeV, this can cause a large change in the number of two photon and tau tau Higgs decay events expected at the LHC compared to the minimal standard model. In the models we consider, the principle of minimal flavor violation is used to suppress flavor changing neutral currents. This paper emphasizes the importance of measuring the properties of the Higgs boson at the LHC; for a range of parameters the model considered has new physics at the TeV scale that is invisible, in the first few hundred inverse femtobarns of integrated luminosity at the LHC, except indirectly through the measurement of Higgs boson properties.

18 pages, 3 figures V2: refs added

References in corpus (4)

• Observing the Dark Scalar Doublet and its Impact on the Standard-Model Higgs Boson at Colliders
• A Higgs-Higgs bound state due to New Physics at a TeV
• Broadening the Higgs Boson with Right-Handed Neutrinos and a Higher Dimension Operator at the Electroweak Scale
• Fermionic Effective Operators and Higgs Production at a Linear Collider

Cited by in corpus (4)

• The Private Higgs
• Physical parameters and basis transformations in the Two-Higgs-Doublet model
• Partially Strong WW Scattering
• Lone Higgs at the LHC