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Sensitivity of Heavy Higgs Boson to the Precision Yukawa Coupling Measurements at Higgs Factories

Kamal Maayergi, Devin G. E. Walker, Michael E. Peskin

Abstract

We investigate the potential of precision Higgs boson coupling measurements to discover heavy Higgs bosons by performing scans of the parameter space in Two-Higgs-Doublet Models (2HDM). Our study encompasses conventional Type I and Type II models, as well as models in which Higgs couplings differ between the third generation and lighter fermion generations. The scans reveal that precision measurements at the sensitivity levels projected for Higgs factories, such as Linear Collider Facility (LCF) and the FCC-ee at CERN and the CEPC in China, are capable of probing heavy Higgs boson masses in the multi-TeV range, with sensitivity extending beyond 5 TeV in certain scenarios. In particular, the precise determination of the charm quark Yukawa coupling at Higgs factories provides a powerful test of the hypothesis that the fermion mass hierarchy arises from an extended Higgs sector with different Higgs fields coupling to the different generations of fermions.

Sensitivity of Heavy Higgs Boson to the Precision Yukawa Coupling Measurements at Higgs Factories

Abstract

We investigate the potential of precision Higgs boson coupling measurements to discover heavy Higgs bosons by performing scans of the parameter space in Two-Higgs-Doublet Models (2HDM). Our study encompasses conventional Type I and Type II models, as well as models in which Higgs couplings differ between the third generation and lighter fermion generations. The scans reveal that precision measurements at the sensitivity levels projected for Higgs factories, such as Linear Collider Facility (LCF) and the FCC-ee at CERN and the CEPC in China, are capable of probing heavy Higgs boson masses in the multi-TeV range, with sensitivity extending beyond 5 TeV in certain scenarios. In particular, the precise determination of the charm quark Yukawa coupling at Higgs factories provides a powerful test of the hypothesis that the fermion mass hierarchy arises from an extended Higgs sector with different Higgs fields coupling to the different generations of fermions.

Paper Structure

This paper contains 8 sections, 29 equations, 13 figures, 1 table.

Table of Contents

  1. Introduction
  2. Structure of Two-Higgs-doublet models
  3. Scalar Potential
  4. Yukawa Sector
  5. Flavorful Two-Higgs-Doublet models
  6. Constraints on $\cos(\alpha-\beta)$
  7. Effects on the fermion Yukawa couplings
  8. Conclusions

Figures (13)

  • Figure 1: The 2$\sigma$ allowed region in the $\text{cos}(\beta-\alpha)$ vs. $\text{tan}\,\beta$ plane for the type 1B 2HDM using data from ATLAS, CMS and the expected signal strengths for the LCF. Please see the text for more details of the analysis.
  • Figure 2: The 2$\sigma$ allowed region in the $\text{cos}(\beta-\alpha)$ vs. $\text{tan}\,\beta$ plane for the type 2B 2HDM using data from ATLAS, CMS and the expected signal strengths for the LCF. Please see the text for more details of the analysis.
  • Figure 3: The 2$\sigma$ allowed region in the $\text{cos}(\beta-\alpha)$ vs. $\text{tan}\,\beta$ plane for the lepton-specific B 2HDM using data from ATLAS, CMS and the expected signal strengths for the LCF. Please see the text for more details of the analysis.
  • Figure 4: The 2$\sigma$ allowed region in the $\text{cos}(\beta-\alpha)$ vs. $\text{tan}\,\beta$ plane for the flipped B 2HDM using data from ATLAS, CMS and the expected signal strengths for the LCF. Please see the text for more details of the analysis.
  • Figure 5: The branching ratios for the 125 GeV Higgs in the type 1B 2HDM.
  • ...and 8 more figures