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Degenerate neutrino masses are excluded by experiment. The experimentallymeasured mass squared differences together with the yet undetermined absoluteneutrino mass scale allow for a quasi-degenerate mass spectrum. For thelightest neutrino mass larger than roughly 0.1 eV, we analyse the influence ofthreshold corrections at the electroweak scale. We show that typical one-loopcorrections can generate the observed neutrino mixing as well as the massdifferences starting from exactly degenerate masses at the tree-level. Thosethreshold corrections have to be explicitly flavour violating. Flavourdiagonal, non-universal corrections are not sufficient to simultaneouslygenerate the correct mixing and the mass differences. We apply the new insightsto an extension of the Minimal Supersymmetric Standard Model with non-minimalflavour violation in the soft breaking terms and discuss the low-energythreshold corrections to the light neutrino mass matrix in that model.

Radiative generation of neutrino mixing: degenerate masses and threshold corrections