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P: 79
 Quote by Vanadium 50 Suppressed by the mechanism of Glashow, Illiopoulos and Maiani. This is a cancellation that occurs in flavor changing neutral currents: decays like K0L -> mu+ mu- and pi0 -> nu nubar. If the neutrinos were exactly degenerate the cancellation would be exact and this decay wouldn't occur. Because they have slightly different masses, the decays are suppressed.