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LFV decays in a 3-4-1 model with minimal inverse seesaw neutrinos
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DOI：10.1016/j.nuclphysb.2026.117575.png)
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Abstract
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We investigate an extended 3-4-1 model consisting of a new singly charged Higgs boson, implementing the minimal inverse seesaw mechanism to account for the current (g−2)e,μ constraints as well as the lepton-flavor-violating decay rates of charged leptons, the Standard Model-like Higgs boson, and the Z boson, all consistent with current experimental data. Unlike the previously studied 3-4-1 realization, the model considered here predicts strong correlations among these observables that can be tested in future experiments. In particular, the current upper bound on Br(τ → μγ) imposes a stringent constraint compatible with the 1σ experimental range of (g−2)μ, corresponding to an allowed deviation of order 10−9 from the SM prediction. The forthcoming experimental sensitivity to Br(τ → μγ) will reduce this deviation to 5×10−10.
Keywords:
Lepton flavor violation
Muon(g-2) anomaly
3-4-1 model
Beyond the standard model
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