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With some modifications, the arguments for rephasing invariance can be usedto establish permutation symmetry for the standard model. The laws of evolutionof physical variables, which transform as tensors under permutation, are foundto obey the symmetry, explicitly. We also propose to use a set of four mixingparameters, with unique properties, which may serve to characterize flavormixing.

Rephasing invariance and permutation symmetry in flavor physics