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arXiv 0905.1569hep-ph
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弱相互作用的SU(2)_L规范理论中的大混合角作为准简并费米子间单圈跃迁的共振效应

Large mixing angles in a SU(2)_L gauge theory of weak interactions as a resonant effect of 1-loop transitions between quasi-degenerate fermions

Bruno Machet

摘要:

我们发现,1圈之间的两个准简并费米子的跃迁可以诱导一个潜在的大重整化的混合角,和一个大的重整化Cabibbo(或PMNS)角时,在同一两代的第二费米子对远离简并。在共振时,“卡比博角”变得最大,并且简单地与质量相关联,而不需要调用任何超出标准模型的新物理学。这个解似乎是唯一的“微扰稳定”解(混合角相对于它们的经典值被小幅度地重整化)。

英文摘要:

We show that 1-loop transitions between two quasi-degenerate fermions can induce a potentially large renormalization of their mixing angle, and a large renormalized Cabibbo (or PMNS) angle when the second fermion pair in the same two generations is far from degeneracy. At the resonance, the "Cabibbo angle" gets maximal and simply connected to masses without invoking any new physics beyond the standard model. This solution appears as the only one "perturbatively stable" (mixing angles are then renormalized with respect to their classical values by small amounts).

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