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arXiv 1205.6776hep-ph
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D介子衰变中的直接CP破坏

Direct CP violation in D-meson decays

Joachim Brod

摘要:

最近,LHCb和CDF合作报告了在D 0-> K+ K-和D 0-> pi+ pi-衰变模式中直接CP不对称性Δ A_CP之间令人惊讶的大差异。一个有趣的问题是,这种测量是否可以在标准模型中得到解释。在这篇评论中,我想传达两个信息:第一,大企鹅收缩可以合理地解释这种测量,并导致一致的图片,也解释了两种模式的衰减率之间的差异。第二,“新物理学”的贡献绝不是被排除在外的;可行的模型是存在的,并且可能被检验。

英文摘要:

Recently, the LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, Delta A_CP, in the D0 -> K+ K- and D0 -> pi+ pi- decay modes. An interesting question is whether this measurement can be explained within the standard model. In this review, I would like to convey two messages: First, large penguin contractions can plausibly account for this measurement and lead to a consistent picture, also explaining the difference between the decay rates of the two modes. Second, "new physics" contributions are by no means excluded; viable models exist and can possibly be tested.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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