Extracting the mass scale of a second Higgs boson from a deviation in $h(125)$ couplings

Abstract

We investigate the correlation between a possible deviation in the discovered Higgs boson $h(125)$ couplings from the Standard Model prediction and the mass scale ($M_{\text{2nd}}$) of the next-to-lightest Higgs boson in models with non-minimal Higgs sectors. In particular, we comprehensively study a class of next-to-minimal Higgs sectors which satisfy the electroweak $\rho$ parameter to be one at tree level. We derive an upper limit on $M_{\text{2nd}}$ by imposing bounds from perturbative unitarity, vacuum stability, triviality and electroweak precision data as functions of the deviation in the $hVV$ ($V=W,Z$) couplings. Furthermore, we discuss the complementarity between these bounds and the current LHC data, e.g., by considering direct searches for additional Higgs bosons and indirect constraints arising from the measured $h(125)$ signal strengths.

37 pages, 36 figures

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• Study of vector boson scattering and search for new physics in events with two same-sign leptons and two jets
• Unitarity bounds in the Higgs model including triplet fields with custodial symmetry
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Cited by in corpus (2)

• CP-Violating 2HDMs Emerging from 3-3-1 Models
• Next-to-leading-order corrections to the Higgs strahlung process from electron-positron collisions in extended Higgs models