While the tripletlike Higgses up to a few hundred GeV masses are already excluded for a vast region of the model parameter space from the LHC searches, strikingly, there is a region of this parameter space that is beyond the reach of the existing LHC searches, and doubly/singly charged and neutral Higgses as light as 200 GeV or even lighter are allowed by the LHC data. We study several search strategies targeting different parts of this LHC elusive parameter space at two configurations of $e^{-}{e}^{+}$ colliders—500 GeV and 1 TeV center of mass energies. We find that a vast region of this parameter space could be probed with $5\sigma$ statistical significance indicating discovery with the early $e^{-}{e}^{+}$ colliders’ data.

• Received 2 June 2022
• Accepted 23 September 2022

DOI:https://doi.org/10.1103/PhysRevD.106.075028

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Published by the American Physical Society