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arXiv 1502.04140hep-ph
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Flavorspin

Flavorspin

Jeffrey Berryman, Daniel Hernández

摘要:

我们提出,标准模型中夸克扇区的味结构是由矢量SU(2)味对称性决定的,我们称之为味旋,在这种对称性下夸克会转变为三重态。基本的汤川耦合是真实的和CP破坏是没有直接联系到味对称性的破缺。一个CP守恒的情况下,自然定义的功能,汤川spurions是完全确定的质量和混合。除了在标准模型混合矩阵中产生大的CP破坏相位之外,CP破坏可以对低能可观测量产生可以忽略的影响。味对称破坏的规模必须很大,以防止相当大的味改变中性电流,如果味自旋是一个较大的味群的剩余对称,它可以被部分抑制。

英文摘要:

We propose that the flavor structure of the quark sector of the Standard Model is determined by a vectorial SU(2) flavor symmetry, which we dub Flavorspin, under which quarks transform as triplets. The fundamental Yukawa couplings are real and CP violation is not directly linked to the breaking of the flavor symmetry. A CP-conserving scenario is naturally defined with the feature that the Yukawa spurions are completely determined in terms of the masses and mixings. CP violation may be introduced with negligible impact on low-energy observables other than generating a large CP violating phase in the Standard Model mixing matrix. The scale of flavor-symmetry violation must be large in order to prevent sizable Flavor Changing Neutral Currents, which can be partially suppressed if Flavorspin is a residual symmetry of a larger flavor group.

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