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arXiv 0901.2056hep-ph
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在最小味破坏内K-和BD-系统中观测到的CP破坏量之间的一致性

On the consistency between the observed amount of CP violation in the K- and Bd-systems within minimal flavor violation

Andrzej J. Buras, Diego Guadagnoli

备注：
10 pages, 3 figures. v2: typo corrected, references improved, small textual modifications. Version submitted to journal
发表信息：
Phys.Rev.D79:053010,2009
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摘要：

我们重新评估的问题是否标准模型，最小的味道违反（MFV）模型在大，可以同时描述所观察到的CP破坏的K-和BD-系统。我们发现，通过（sin 2 β）_{J/psi Ks}最精确地测量的BD系统中的CP破坏意味着|_K^{SM}|= 1.78（25）x 10^{-3}，用于测量K系统中的间接CP破坏参数，并与实验值进行比较|_K^{exp}|= 2.23（1）x 10^{-3}。为了使这一预测与实验1西格玛协议，我们探讨了最简单的新物理的可能性，不涉及新的阶段，即MFV的情况下，没有新的有效运营商除了标准模型的。我们强调关键的输入和/或测量要改进，以探测这种情况。特别是，我们指出，这种紧张局势可以在这个框架中删除，有趣的签名，例如相关的抑制模式罕见的K衰变分支比。另一方面，在可计算的MSSM情况下，新经营者的MFV缴款似乎使情况恶化。最后，我们探讨了一些动机良好的新物理场景MFV之外，像那些涉及Z企鹅的通用新贡献。

英文摘要：

We reappraise the question whether the Standard Model, and Minimal Flavor Violating (MFV) models at large, can simultaneously describe the observed CP violation in the K- and Bd-systems. We find that CP violation in the Bd-system, measured most precisely through (sin 2 beta)_{J/psi Ks}, implies |epsilon_K^{SM}| = 1.78(25) x 10^{-3} for the parameter epsilon_K, measuring indirect CP violation in the K-system, to be compared with the experimental value |epsilon_K^{exp}| = 2.23(1) x 10^{-3}. To bring this prediction to 1 sigma agreement with experiment, we explore then the simplest new-physics possibility not involving new phases, namely that of MFV scenarios with no new effective operators besides the Standard Model ones. We emphasize the crucial input and/or measurements to be improved in order to probe this case. In particular we point out that this tension could be removed in this framework, with interesting signatures, e.g. correlated suppression patterns for rare K decay branching ratios. On the other hand, MFV contributions from new operators appear, in the calculable case of the MSSM, to worsen the situation. We finally explore some well-motivated new-physics scenarios beyond MFV, like those involving generic new contributions in Z-penguins.

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