Cornering variants of Georgi-Machacek model using Higgs precision data

Abstract

We show that in the absence of trilinear terms in the scalar potential of Georgi-Machacek model, heavy charged scalars do not necessarily decouple from the $h\to \gamma \gamma$ decay amplitude. In such scenarios, measurement of the Higgs to diphoton signal strength can place stringent constraints in the parameter space. Using the projected precisions at the High Luminosity LHC (HL-LHC) and the ILC, we find that the upper bound on the triplet vacuum expectation value can be as low as 10 GeV. We also found that when combined with the theoretical constraints from perturbative unitarity and stability, such variants may be ruled out altogether.

9 pages, 4 captioned figures. Accepted for publication in Phys. Rev. D

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• Constraining the Georgi-Machacek Model with a Light Higgs
• Impact of Yukawa-like dimension-5 operators on the Georgi-Machacek model
• More Constraints on the Georgi-Machacek Model
• Vacuum structure of the ${\mathbb{Z}}_2$ symmetric Georgi-Machacek model
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• Custodial symmetry, Georgi-Machacek model, and other scalar extensions
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• Charged Higgs decay to $W^{\pm }$ and heavy neutral Higgs decaying into ${\tau }^{+}{\tau }^{-}$ in Georgi Machacek Model at LHC
• LHC Signatures of the Generic Georgi-Machacek Model
• Doubly charged Higgs boson at same-sign lepton colliders
• Higgs triplet extension of GRACE