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For some theoretical and experimental considerations, the relatively light Majorana neutrinos at the GeV scale have been attracting some interest. In this article we consider a scenario with only one Majorana neutrino N, negligible mixing with the active neutrinos νL, where the Majorana neutrino interactions could be described in a model independent approach based on an effective theory. Under such...
Considering the constraints of the lepton flavor violating (LFV) processes μ→3e and τ→3μ on the LFV couplings Z′ℓiℓj, in the contexts of the E6 models, the left–right (LR) models, the “alternative” left–right (ALR) models and the 331 models, we investigate the contributions of the extra gauge boson Z′ to the decay rates of the processes ℓi→ℓjνℓνℓ, τ→μP and P→μe with P=π0,η and η′. Our numerical results...
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