Renormalization group evolution of Dirac neutrino masses

There are good reasons why neutrinos could be Majorana particles, but thereexist also a number of very good reasons why neutrinos could have Dirac masses.The latter option deserves more attention and we derive therefore analyticexpressions describing the renormalization group evolution of mixing angles andof the CP phase for Dirac neutrinos. Radiative corrections to leptonic mixingsare in this case enhanced compared to the quark mixings because the hierarchyof neutrino masses is milder and because the mixing angles are larger. Therenormalization group effects are compared to the precision of current andfuture neutrino experiments. We find that, in the MSSM framework, radiativecorrections of the mixing angles are for large \tan\beta comparable to theprecision of future experiments.Comment: 19 pages, 5 figures; error in eq. 8 corrected, references adde