Lepton-Flavour Violation in Ordinary and Supersymmetric Grand Unified Theories
2000 年 69 巻 2 号 p. 369-372
詳細
2000 年 69 巻 2 号 p. 369-372
By an explicit calculation we show that in ordinary SU(5) logarithmic divergence in the amplitude of μ → eγ cancels among diagrams and remaining finite part is suppressed by at least 1/MGUT2. In SUSY SU(5), when the effect of flavour changing wave function renormalization is taken into account such logarithmic correction disappears, provided a condition is met among SUSY breaking masses. In SUGRA-inspired SUSY GUT the remaining logarithmic effect is argued not to be taken as a prediction of the theory.
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