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In a novel parametrization of neutrino mixing and in the approximation of$\tau$-lepton dominance, we show that the one-loop renormalization-groupequations (RGEs) of Dirac neutrinos are different from those of Majorananeutrinos even if two Majorana CP-violating phases vanish. As the latter cankeep vanishing from the electroweak scale to the typical seesaw scale, it makessense to distinguish between the RGE running effects of neutrino mixingparameters in Dirac and Majorana cases. The differences are found to be quitelarge in the minimal supersymmetric standard model with sizable $\tan\beta$,provided the masses of three neutrinos are nearly degenerate or have aninverted hierarchy.Comment: 12 pages, 5 figure

Distinguishable RGE Running Effects Between Dirac Neutrinos and Majorana Neutrinos with Vanishing Majorana CP -Violating Phases