Abstract
We study a search for the charged Higgs boson via e+e− → H+H− → \( \overline{c}b\overline{c}b \) at the 500 GeV ILC. In a general two Higgs doublet model without Z2 symmetry, extra Yukawa couplings ρtt and ρtc can drive baryogenesis, but searches at the HL-LHC may still go empty-handed if the couplings are relatively weak. Taking \( {m}_{H^{+}} \) ≃ mH ≃ mA ≃ 200 GeV, with ρtt, ρtc ∼ 0.1 and no h(125)-H mixing, H+ → \( c\overline{b} \) decay is dominant, and the \( \overline{c}b\overline{c}b \) final state is likely overwhelmed by QCD background at the LHC. We show that the electroweak production of H+H− at the ILC is discoverable with integrated luminosity of 1 ab−1. Furthermore, we show that \( {m}_{H^{+}} \) can be extracted by requiring the two pairs of b and light jets be roughly equal in mass, without assuming the mass value. Thus, ILC can probe low mass Higgs bosons in multijet final states to complement HL-LHC in the future.
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Hou, WS., Jain, R. & Modak, T. Searching for Charged Higgs Bosons via e+e− → H+H− → \( \overline{c}b\overline{c}b \) at Linear Colliders. J. High Energ. Phys. 2022, 137 (2022). https://doi.org/10.1007/JHEP07(2022)137
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DOI: https://doi.org/10.1007/JHEP07(2022)137