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Aligned Zee-Grimus-Neufeld model for (g−2)μ

R. E. A. Bringas1,*, A. L. Cherchiglia2,†, G. De Conto1,‡, and C. C. Nishi3,§

  • *Contact author: ruben.bringas@ufabc.edu.br
  • †Contact author: alche@unicamp.br
  • ‡Contact author: george.de.conto@gmail.com
  • §Contact author: celso.nishi@ufabc.edu.br
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Phys. Rev. D 112, 075046 – Published 27 October, 2025

DOI: https://doi.org/10.1103/t5jf-fb3q

Abstract

The recent result of the Fermilab Muon g-2 experiment is still in conflict with the standard model (SM) prediction if dispersive methods are used as input for the hadronic vacuum polarization. We seek models where the same set of mediators around the weak scale or above contribute to neutrino masses and to the muon g−2 through a chiral enhanced contribution. As family lepton number violation is inherent to the former, non-negligible charged lepton flavor violation will be induced. We arrive at the following field content additional to the SM: one Higgs doublet, one singly charged scalar, and one right-handed neutrino. Neutrino masses will be generated by a combination of mechanisms: the tree-level seesaw, Zee mechanism, and Grimus-Neufeld mechanism, while lepton flavor violation will be minimized by considering Yukawa-aligned Higgs doublets. The setting is flexible enough to account for (g−2)μ, the Cabibbo angle anomaly, and the W mass deviation, while avoiding dangerous charged lepton flavor violation.

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Physics Subject Headings (PhySH)

Corrections

29 July, 2026

Correction: Minor errors in Eqs. (31) and (55) and in the text following Eqs. (33), (79), and (99) have been fixed.

Article Text

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Phys. Rev. D 112, 075046– Published 27 October, 2025
  • Received 19 July 2025
  • Accepted 30 September 2025
  • Corrected 29 July 2026
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