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arXiv · 1808.10152

Models with higher weak-isospin Higgs multiplets

Cheng-Wei Chiang·Kei Yagyu
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Abstract

In order for scale factors $κ_{V}^{}~(V=W,Z)$ of the 125-GeV Higgs boson couplings to have the possibilities of being greater than unity and $κ_{W}^{} \neq κ_{Z}^{}$ while keeping the electroweak $ρ$ parameter unity at tree level, the Higgs sector must be extended with at least two exotic $SU(2)_L$ multiplets in addition to the doublet Higgs field in the Standard Model. By the requirements of perturbative unitarity, no Landau pole in gauge couplings, and no accidental global $U(1)$ symmetry, we exhaust all the possible combinations of two exotic Higgs fields and derive general formulas for $κ_{V}^{}$. We find that the current central values $κ_W^{}=1.12$ and $κ_Z = 0.99$ reported by CMS can be accommodated in the model with a complex and a real Higgs triplets as the simplest example.

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Cheng-Wei Chiang, Kei Yagyu. 2018-08-30. Models with higher weak-isospin Higgs multiplets. https://doi.org/10.1016/j.physletb.2018.09.050

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