Double Higgs boson production at $e^{+}{e}^{-}$ colliders in the two-Higgs-doublet model

Abstract

We study the double Higgs boson production processes $e^{+}{e}^{-}\to hhf\bar{f}$ ($f\ne t$) with $h$ being the 125 GeV Higgs boson in the two-Higgs-doublet model with a softly-broken $Z_2$ symmetry. The cross section can be significantly enhanced, typically a few hundreds percent, as compared to the standard model prediction due to resonant effects of heavy neutral Higgs bosons, which becomes important in the case without the alignment limit. We find a strong correlation between the enhancement factor of the cross section and the scaling factor of the $hf\bar{f}$ couplings under constraints from perturbative unitarity, vacuum stability and current experimental data at the LHC as well as the electroweak precision data.

Version accepted in Phys. Rev. D

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• Dual electroweak phase transition in the two-Higgs-doublet model with the $S_3$ discrete symmetry
• Di-Higgs production as a probe of flavor changing neutral Yukawa couplings
• Prospects for exotic $h\to 4\tau$ decays in single and di-Higgs boson production at the LHC and future hadron colliders
• Correlation between the scaling factor of the yukawa coupling and cross section for the $e^{+}{e}^{-}\to hhf\overline{f}$ ($f\ne t$) in type-I 2HD
• Higgs triplet extension of GRACE
• Two Higgs doublet model fitting and $t\bar{t}b\bar{b}$ signal at the ILC
• $e^{+}{e}^{-}\to hhZ$ in the B-L symmetric SSM