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  • Open Access

Observability of 2HDM charged Higgs boson in a misaligned scenario

Majid Hashemi* and Omid Seify†

  • Department of Physics, College of Science, Shiraz University, Shiraz, 71946-84795, Iran

  • *Contact author: hashemi_mj@shirazu.ac.ir
  • †Contact author: omidseify@hafez.shirazu.ac.ir
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Phys. Rev. D 112, 035029 – Published 20 August, 2025

DOI: https://doi.org/10.1103/rp5d-c795

Abstract

The Large Hadron Collider precision measurement of h125 properties suggests that a misaligned two-Higgs-doublet model (2HDM) type I is preferred among other types of the model. In this analysis, a lepton collider potential for charged Higgs boson observation is evaluated and compared with HL-LHC expectations. We focus on H±→W±h125 decay which is exclusively activated in misaligned scenario. An event analysis including fast detector simulation is performed, and it is shown that some parts of the parameter space which are out of HL-LHC reach can be probed by a high-energy lepton collider with signal significance exceeding 2σ and 5σ for exclusion or discovery. The region with highest sensitivity is in the middle range charged Higgs boson mass, i.e., 350<mH±<450  GeV and tanβ≳4 at nonzero cos(β−α) values.

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Phys. Rev. D 112, 035029– Published 20 August, 2025
  • Received 14 October 2024
  • Accepted 29 July 2025
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