Abstract
In order to identify the Higgs sector using future precision data, we calculate the partial decay widths of the discovered Higgs boson with the mass of 125 GeV into fermion pairs and gauge-boson pairs with one-loop electroweak and one-loop QCD corrections in various extended Higgs models, such as the Higgs singlet model and four types of two Higgs doublet models. In the tree-level analysis, the patterns of deviations from the standard model predictions in the partial decay widths for various decay modes are distinctive for each model, due to the mixing of the Higgs boson with other neutral scalars. Our present analysis shows that even with a full set of radiative corrections we can discriminate these extended Higgs models via the partial decay widths as long as any of the deviations is detected at future precision measurements. Furthermore, we quantitatively show that in each model the magnitude of the deviations can provide important information on the mass scale of extra Higgs bosons under the theoretical constraints from perturbative unitary and vacuum stability, which can be obtained without discovery of the additional Higgs bosons.
Highlights
Except a resonance with the 125 GeV mass, the LHC experiments have not observed any other states expected by new physics (NP) beyond the standard model (SM), and instead put limits on them to higher and higher mass scales by increasing the collision energy and accumulating more data
Our present analysis shows that even with a full set of radiative corrections we can discriminate these extended Higgs models via the partial decay widths as long as any of the deviations is detected at future precision measurements
In order to examine the Higgs sector using future precision data, we have studied the deviations from the SM predictions for the various partial decay widths of the 125 GeV Higgs boson with one-loop EW and one-loop QCD corrections in extended Higgs models, such as the Higgs singlet model (HSM) as a real singlet extension and four types of the two Higgs doublet model (THDM) with softly broken Z2 symmetry
Summary
Except a resonance with the 125 GeV mass, the LHC experiments have not observed any other states expected by new physics (NP) beyond the standard model (SM), and instead put limits on them to higher and higher mass scales by increasing the collision energy and accumulating more data. [27] a full set of the numerical code (H-COUPv1) to evaluate the renormalized gauge invariant vertex functions for the SM-like Higgs boson has been released in various extended Higgs models: the HSM, four types of the THDM and the inert doublet model (IDM), based on Refs. In order to identify the Higgs sector using future precision data, we calculate the partial decay widths of the discovered Higgs boson (h) into fermion pairs and gauge-boson pairs with one-loop electroweak (EW) and one-loop QCD corrections in the HSM and four types of the THDM. The radiative corrections to the Higgs boson decay rates discussed in this work are inevitable to be compared with these precise measurements in the future experiments.
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