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arXiv 1006.2127hep-ph
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MFV中的Bs混合和电偶极矩

Bs Mixing and Electric Dipole Moments in MFV

Brian Batell, Maxim Pospelov

摘要:

我们分析了一般结构的四费米子运营商能够引入CP破坏优先在Bs混合的最小味破坏的框架内。该效应需要最少O(Yu^4 Yd^4)Yukawa插入,在这个顺序下,我们发现总共有六个具有不同洛伦兹、颜色和味道收缩的算子,这些收缩导致了增强的Bs混合。然后,我们估计的影响,这些运营商和他们的近亲的可能大小的电偶极矩(EDM)的中子和重原子。我们确定了两大类这样的运营商:那些给EDM在消失的CKM角的限制,和那些需要夸克混合的存在非零EDM。在第一类中的操作员的EDM的自然值是高达一个数量级以上的实验上限,而第二组预测EDM远低于当前的灵敏度水平。最后,我们讨论了合理的UV-完成每种类型的操作。

英文摘要:

We analyze the general structure of four-fermion operators capable of introducing CP-violation preferentially in Bs mixing within the framework of Minimal Flavor Violation. The effect requires a minimum of O(Yu^4 Yd^4) Yukawa insertions, and at this order we find a total of six operators with different Lorentz, color, and flavor contractions that lead to enhanced Bs mixing. We then estimate the impact of these operators and of their close relatives on the possible sizes of electric dipole moments (EDMs) of neutrons and heavy atoms. We identify two broad classes of such operators: those that give EDMs in the limit of vanishing CKM angles, and those that require quark mixing for the existence of non-zero EDMs. The natural value for EDMs from the operators in the first category is up to an order of magnitude above the experimental upper bounds, while the second group predicts EDMs well below the current sensitivity level. Finally, we discuss plausible UV-completions for each type of operator.

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