Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-13
Commun.Theor.Phys.48:525,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 5 figures
Scientific paper
10.1088/0253-6102/48/3/027
In a novel parametrization of neutrino mixing and in the approximation of $\tau$-lepton dominance, we show that the one-loop renormalization-group equations (RGEs) of Dirac neutrinos are different from those of Majorana neutrinos even if two Majorana CP-violating phases vanish. As the latter can keep vanishing from the electroweak scale to the typical seesaw scale, it makes sense to distinguish between the RGE running effects of neutrino mixing parameters in Dirac and Majorana cases. The differences are found to be quite large in the minimal supersymmetric standard model with sizable $\tan\beta$, provided the masses of three neutrinos are nearly degenerate or have an inverted hierarchy.
Xing Zhi-zhong
Zhang He
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