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Extended inert doublet model with low scale seesaw mechanisms

D. T. Huong1,*, A. E. Cárcamo Hernández2,3,4,†, H. T. Hung5,‡, T. T. Hieu6,5,§, Nicolás A. Pérez-Julve2,4,∥, and N. T. Duy7,¶

  • *Contact author: dthuong@iop.vast.vn
  • †Contact author: antonio.carcamo@usm.cl
  • ‡Contact author: hathanhhung@hpu2.edu.vn
  • §Contact author: tranhieusp2@gmail.com
  • ∥Contact author: nicolasperezjulve@gmail.com
  • Contact author: ntduy@iop.vast.vn
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Phys. Rev. D 113, 055045 – Published 26 March, 2026

DOI: https://doi.org/10.1103/7fqx-9fb1

Abstract

We have developed an extension of the inert doublet model in which the CP phases in the weak sector are generated from one-loop level corrections mediated by dark fields, while the strong CP phase remains vanishing at three loops. In this framework, the tiny masses of the active neutrinos are produced through a radiative inverse seesaw mechanism at a two-loop level, the masses of the first and second families of Standard Model (SM) charged fermions arise from a one-loop level radiative seesaw mechanism, and the third generation of SM charged fermion masses are generated at tree level. We have demonstrated that the proposed model successfully accounts for SM fermion masses and mixings. The radiative nature of the seesaw mechanisms is attributed to preserved discrete symmetries, which are required for ensuring the stability of fermionic and scalar dark matter candidates. The preserved discrete symmetries also allow for multicomponent dark matter, whose annihilation processes permit one to successfully reproduce the measured amount of dark matter relic abundance for an appropriate region of parameter space, which has been shown to be compatible with current dark matter direct detection limits. Besides that, we explore the model’s ability to explain the 95 GeV diphoton excess observed by the CMS Collaboration, showing that it readily accommodates this anomaly. We also have shown that charged lepton flavor violating decays acquire rates within the current experimental sensitivity.

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Phys. Rev. D 113, 055045– Published 26 March, 2026
  • Received 20 November 2025
  • Accepted 6 February 2026
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