Abstract
Imposing the theoretical constraints from vacuum stability, unitarity and perturbativity as well as the experimental constraints from the electroweak precision data, flavor observables and the non-observation of additional Higgs at collider, we study the implications of available Higgs signals on a two-Higgs-doublet model with the alignment of the down-type quarks and charged lepton Yukawa coupling matrices. Compared to the four traditional types of two-Higgs-doublet models, the model has two additional mixing angles θ d and θ l in the down-type quark and charged lepton Yukawa interactions. We find that the mixing angle θ d can loose the constraints on sin(β − α), tan β and m H ± sizably. The model can provide the marginally better fit to available Higgs signals data than SM, which requires the Higgs couplings with gauge bosons, \( u\overline{u} \) and \( d\overline{d} \) to be properly suppressed, and favors (1 < θ d < 2, 0.5 < θ l < 2.2) for m h = 125.5 GeV and (0.5 < θ d < 2, 0.5 < θ l < 2.2) for m H = 125.5 GeV. However, these Higgs couplings are allowed to have sizable deviations from SM for (m h = 125.5 GeV, 125.5 ≤ m H ≤ 128 GeV) and (125 GeV ≤ m h ≤ 125.5 GeV, m H = 125.5 GeV).
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Wang, L., Han, XF. Status of the aligned two-Higgs-doublet model confronted with the Higgs data. J. High Energ. Phys. 2014, 128 (2014). https://doi.org/10.1007/JHEP04(2014)128
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DOI: https://doi.org/10.1007/JHEP04(2014)128