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Can γγ collisions rival e−e+ in probing doubly charged Higgs bosons?

Abdesslam Arhrib*

Rachid Benbrik†

Mohammed Boukidi‡

Mohamed Chabab§

Khalid Goure∥

Stefano Moretti

  • Laboratory of Physics, Energy, Environment, and Applications, Cadi Ayyad University, Sidi Bouzid, P.O. Box 4162, Safi, Morocco

  • Cadi Ayyad University, Faculty of Science Semlalia, LPHEAG, P.O.B. 2390 Marrakech 40000, Morocco. and Cadi Ayyad University, National School of Applied Science, P.O.B. 63 Safi 46000, Morocco

  • *Contact author: aarhrib@gmail.com
  • †Contact author: r.benbrik@uca.ac.ma
  • ‡Contact author: mohammed.boukidi@ifj.edu.pl
  • §Contact author: mchabab@uca.ac.ma
  • ∥Contact author: khalidgoure01@gmail.com
  • Contact author: stefano.moretti@physics.uu.se, s.moretti@soton.ac.uk
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Phys. Rev. D 114, 095022 – Published 10 November, 2026

DOI: https://doi.org/10.1103/6y56-hhgs

Abstract

High-energy γγ collisions, realizable as an operational mode of future lepton linear colliders such as the ILC and CLIC, provide a promising environment to probe extended Higgs sectors. We investigate the sensitivity of such colliders to doubly charged Higgs bosons within the 2-Higgs doublet model with type-II seesaw (2HDMcT). Focusing on the three-body production channels γγ→H±±H1∓H1∓ and γγ→H±±H1∓W∓, we perform a parameter space scan consistent with theoretical constraints as well as current collider, flavor, and electroweak precision observables (EWPOs). We show that γγ collisions can rival the discovery potential of the conventional e+e− mode for probing doubly charged Higgs bosons through a 4ℓ+ET signature (ℓ=e, μ). Despite the reduced effective luminosity resulting from the photon spectrum, the significantly enhanced production cross sections, exceeding those in electron-positron collisions by more than one order of magnitude, compensate for this limitation. By performing a detailed signal-to-background analysis at center-of-mass energies of s=830 and 1245 GeV, we demonstrate that a discovery significance at the 5σ level can be achieved for viable benchmark points (BPs).

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Phys. Rev. D 114, 095022– Published 10 November, 2026
  • Received 24 August 2026
  • Accepted 16 October 2026
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