Probing an extra Higgs boson at future linear e⁺ e^- colliders

2025/11/04 by Hou, Wei-Shu, Krab, Mohamed
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2511.02420

Abstract

We investigate the possibility of probing an extra Higgs boson at future linear e⁺ e^- colliders. We consider the production process e⁺e^- → Hνν, followed by the decay H → W⁺W^-, where H is the extra CP-even Higgs boson of the general two Higgs doublet model (G2HDM). This process is governed by the CP-even Higgs mixing angle, cosγ, offering direct access to this parameter. We discuss constraints on cosγ using existing LHC data and test the viability of the G2HDM top-quark-driven scenario for electroweak baryogenesis. We perform a full Monte Carlo simulation of the signal and background, and show that an extra Higgs boson in the mass range 200 ≤ m_H ≤ 400 GeV could be probed at high energy linear e⁺ e^- colliders. Promising results are found for CLIC running at 1.5 and 3 TeV collision energies.

Citations

• Searching for charged Higgs bosons with flavor-changing couplings at the LHC
• Probing the general 2HDM with flavor violation through A → ZH
• Search for flavor-changing neutral current interactions of the top quark mediated by a Higgs boson in proton-proton collisions at 13 TeV
• Reconstructing the general 2HDM charged Higgs boson at the LHC
• Testing CP-violation in a Heavy Higgs Sector at CLIC
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• The International Linear Collider: Report to Snowmass 2021
• Probing Top Changing Neutral Higgs Couplings at Colliders
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Related

• Searching for charged Higgs bosons via e⁺ e^- → H^± W^∓ S at the ILC
• Studying the Higgs Sector at the CLIC Multi-TeV e⁺e^- Collider
• Charting the Higgs Boson Profile e+e- Linear Colliders
• Searching for extra Higgs bosons via pp→ H,A→ τμ, ττ at the Large Hadron Collider
• Higgs Physics at a Future e+e- Linear Collider