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We show that 1-loop transitions between two quasi-degenerate fermions caninduce a potentially large renormalization of their mixing angle, and a largerenormalized Cabibbo (or PMNS) angle when the second fermion pair in the sametwo generations is far from degeneracy. At the resonance, the "Cabibbo angle"gets maximal and simply connected to masses without invoking any new physicsbeyond the standard model. This solution appears as the only one"perturbatively stable" (mixing angles are then renormalized with respect totheir classical values by small amounts).

Large mixing angles in a SU(2)_L gauge theory of weak interactions as a resonant effect of 1-loop transitions between quasi-degenerate fermions