Abstract
We study the effects of including Yukawa-like dimension-5 operators in the Georgi-Machacek model where the Standard Model is augmented with triplet scalars. We focus only on the charged Higgs sector and investigate the constraints arising from radiative B-meson decays, neutral B-meson mixing and precision measurement of Zbb vertex. We observe that the inclusion of the dimension-5 operators causes substantial alteration of the limits on the charged Higgs masses and the vacuum expectation value of the triplets, derived otherwise using only the dimension-4 operators.
Highlights
The standard model (SM) Higgs-like scalar boson, discovered at the Large Hadron Collider (LHC), has not yet provided a full understanding of the dynamics of electroweak symmetry breaking
Many motivated beyond the SM (BSM) scenarios postulate the presence of additional scalars (e.g., SU(2) singlet/doublet/triplet)
In the absence of any new physics signals at the LHC so far, an effective field theory approach with higher-dimensional operators has been employed in different contexts [1,2,3,4,5]
Summary
The standard model (SM) Higgs-like scalar boson, discovered at the Large Hadron Collider (LHC), has not yet provided a full understanding of the dynamics of electroweak symmetry breaking. In addition to the renormalizable Yukawa terms involving the SM doublet Higgs, we include dimension-five operators in the quark sector (especially, the third generation) employing the scalar triplet as well. Our main focus is to explore indirect constraints on the charged Higgs sector in the GM model by admitting dimension-five operators that involve the scalar triplets and the heavy third generation quarks. We note that the presence of higher-dimensional Yukawa-like operators is, a generic feature of a large class of BSM theories. They can arise, for example, when heavy vector-like fermions are integrated out [29,30]. Depending on the relative sign and magnitude of the coefficients of these dimension-five operators, the constraints on the charged Higgs masses can be substantially modified from the existing limits obtained employing the usual dimension-four operators only
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