The evolution of neutrino masses and mixings in the 5D MSSM

We consider a five-dimensional Minimal Supersymmetric Standard Model compactified on a S¹/Z₂ orbifold, and study the evolution of neutrino masses, mixing angles and phases for different values of β and different radii of compactification. We consider the usual four-dimensional Minimal Supersymmetric Standard Model limit plus two extra-dimensional scenarios: where all matter superfields can propagate in the bulk, and where they are constrained to the brane. We discuss in both cases the evolution of the mass spectrum, the implications for the mixing angles and the phases. We find that a large variation for the Dirac phase is possible, which makes models predicting maximal leptonic CP violation particularly appealing.