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Searching for charged Higgs bosons via e+e−→H±W∓S at the ILC

Brahim Ait Ouazghour1,*, Abdesslam Arhrib2,3,†, Kingman Cheung3,4,‡, Es-said Ghourmin5,§, Mohamed Krab6,∥, and Larbi Rahili5,¶

  • *Contact author: b.ouazghour@gmail.com
  • †Contact author: aarhrib@gmail.com
  • ‡Contact author: cheung@phys.nthu.edu.tw
  • §Contact author: s.ghourmin123@gmail.com
  • ∥Contact author: mkrab@hep1.phys.ntu.edu.tw
  • Contact author: rahililarbi@gmail.com
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Phys. Rev. D 112, 055022 – Published 16 September, 2025

DOI: https://doi.org/10.1103/rf5m-wb6y

Abstract

We investigate the phenomenology of the charged Higgs boson at the International Linear Collider (ILC) within the framework of the type-X Two-Higgs Doublet Model, where a light charged Higgs boson, with a mass around 200 GeV or even smaller than top quark mass, is still being consistent with flavor physics data as well as with collider experimental data. In the theoretically and experimentally allowed parameter space, the e+e−→H±W∓S (with S=H, A) production processes can yield signatures with event rates larger than those from e+e−→H+H− and offer sensitivity to the Higgs mixing parameter sin(β−α). We consider the bosonic H±→W±S decays, where the neutral scalar S further decays into a pair of tau leptons. We show, through a detector-level Monte Carlo analysis, that the resulting [ττ][ττ]WW final state could be seen at the ILC with at least 500 GeV center-of-mass energy and 500  fb−1 of luminosity.

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Phys. Rev. D 112, 055022– Published 16 September, 2025
  • Received 5 June 2025
  • Accepted 28 August 2025
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