Adding one triplet and one singlet scalar leptoquark to the 331RHN model generates one-loop Majorana masses for active neutrinos and two-loop masses for sterile neutrinos, with benchmark parameters consistent with current rare decay limits.
The strong-CP question in SU(3)_c X SU(3)_L X U(1)_N models
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We analyze two recent models based on the gauge group SU(3)$_c\times$SU(3)$_L\times$U(1)$_N$ where each generation is not anomaly-free, but anomaly cancels when three generations are taken into account. We show that the most general Yukawa couplings of these models admit of a Peccei-Quinn symmetry. This symmetry can be extended to the entire Lagrangian by using extra fields in a very elegant way so that the resulting axion can be made invisible.
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Leptoquark-induced radiative masses for active and sterile neutrinos within the framework of the 3-3-1 model
Adding one triplet and one singlet scalar leptoquark to the 331RHN model generates one-loop Majorana masses for active neutrinos and two-loop masses for sterile neutrinos, with benchmark parameters consistent with current rare decay limits.