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The R-symmetry formalism is applied for the supersymmetric SU(3)C⊗SU(3)L⊗U(1)X (3-3-1) model with right-handed neutrinos. For this kind of models, we study the generalization of the MSSM relation among R-parity, spin and matter parity. Discrete symmetries for the proton stable in this model are imposed, and we show that in such a case it is able to give leptons masses at only the tree level contributions...
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