Two Higgs doublet model fitting and $t\bar{t}b\bar{b}$ signal at the ILC

Abstract

One of the most straightforward extensions of the standard model (SM) is having an additional Higgs doublet to the SM, namely the two Higgs doublet models(THDM). In the type-I model, an additional Higgs doublet is introduced that does not couple to any fermion via the Yukawa interaction in the original Lagrangian. Considering various theoretical and phenomenological constraints, we have found the best-fitted parameter set in the type-I model using the minimum ${\chi }^2$ method by scanning the model's parameter space. We show that this optimal parameter set can be tested by precisely analyzing the decay processes $D_s^{+}\to {\tau }^{+}{\nu }_{\tau }$, $D^{+}\to {\mu }^{+}{\nu }_{\mu }$, and $B^0\to K^{\ast }{\mu }^{+}{\mu }^{-}$. Moreover, the decay channels $h\to \gamma \gamma$ and $Z\gamma$ can be used to distinguish the model from the SM. For a direct search of the model at future colliders, we have proposed an investigation of the $e^{+}{e}^{-}\to t\bar{t}b\bar{b}$ process at the ILC to detect the new physics of the model. Considering the initial state radiation correction and applying appropriate background cuts, the calculation result of the scattering cross section shows that it is feasible to observe a clear and unique signal in the $t\bar{b}$ invariant mass distribution corresponding to the charged Higgs pair creations.

20 pages, 11 figures

References in corpus (27)

• SuperIso v3.0: A program for calculating flavor physics observables in 2HDM and supersymmetry
• The oblique parameters in multi-Higgs-doublet models
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Models of Yukawa interaction in the two Higgs doublet model, and their collider phenomenology
• SuperIso: A program for calculating the isospin asymmetry of B -> K* gamma in the MSSM
• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• Flavor Changing Neutral Currents, an Extended Scalar Sector, and the Higgs Production Rate at the LHC
• HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals
• Fingerprinting non-minimal Higgs sectors
• Analysis of neutral $B$-meson decays into two muons
• Exploring Two Higgs Doublet Models Through Higgs Production
• Heavy Higgs Bosons in 2HDM at a Muon Collider
• Light Higgs bosons in Two-Higgs-Doublet Models
• Next-to-leading order unitarity fits in Two-Higgs-Doublet models with soft ${\mathbb{Z}}_2$ breaking
• Charged Higgs on $B^{-}\to \tau {\bar{\nu }}_{\tau }$ and $\bar{B}\to P(V)\ell {\bar{\nu }}_{\ell }$
• Flavour alignment in multi-Higgs-doublet models
• GUT Physics in the era of the LHC
• Global fits in the Aligned Two-Higgs-Doublet model
• Probing extended Higgs sectors by the synergy between direct searches at the LHC and precision tests at future lepton colliders
• Muon and electron $g-2$ anomalies in a flavor conserving 2HDM with an oblique view on the CDF $M_W$ value
• Exploring sizable triple Higgs couplings in the 2HDM
• Likelihood analysis of the flavour anomalies and $g-2$ in the general two Higgs doublet model
• Low-mass fermiophobic charged Higgs phenomenology in two-Higgs-doublet models
• Testing Exotic Scalars with HiggsBounds
• Updated global fit of the aligned two-Higgs-doublet model with heavy scalars
• Sensitivity to Triple Higgs Couplings via Di-Higgs Production in the 2HDM at e+e- Colliders
• Discrimination of Supersymmetric Grand Unified Models in Gaugino Mediation