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There is new experimental evidence which may be interpreted as a small departure from quark-lepton universality. We propose to understand this as the result of a hierarchy of mass scales in analogy to for strong isospin. We show $(G_F)^{NC}{lq} < (G_F)^{CC}{lq} < (G_F)^{CC}{ll} < (G_F)^{NC}{ll}$ in principle, but all are still approximately equal. New physics is predicted at the TeV scale.

生成讲解博客的中文版本

生成AI智能校验的中文版本