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Constraining the CP4-invariant three-Higgs-doublet model via top quark decays

Duanyang Zhao* and Igor P. Ivanov†

  • *Contact author: zhaody8@mail2.sysu.edu.cn
  • †Contact author: ivanov@mail.sysu.edu.cn
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Phys. Rev. D 112, 095040 – Published 24 November, 2025

DOI: https://doi.org/10.1103/wylv-96px

Abstract

CP4 3HDM is a peculiar three-Higgs-doublet model in which a single symmetry leads to tight constraints on the scalar and Yukawa sectors. In this models, tree-level flavor-changing neutral couplings are unavoidable; however, as previously shown, their contributions to neutral meson oscillations can be suppressed. Here, we explore the remaining quark flavor violating effects, which give rise to the top quark decays to light scalars, including the 125 GeV Higgs boson hSM, as well as the magnitude of the hSMtt¯ coupling. Utilizing the recently developed scanning procedure, in which observables are used as input, we narrow down the viable options to a unique CP4-invariant Yukawa sector capable of satisfying all meson oscillation and top quark constraints. We present benchmark models that feature neutral or charged Higgs bosons lighter than the top quark, and we look forward to testing them further at the LHC and through flavor physics observables.

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Phys. Rev. D 112, 095040– Published 24 November, 2025
  • Received 13 July 2025
  • Accepted 28 October 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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