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arXiv 1807.02520hep-phhep-exhep-lat
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标准模型之外的$\varepsilon'/\varepsilon$主配方

Master formula for $\varepsilon'/\varepsilon$ beyond the Standard Model

Jason Aebischer, Christoph Bobeth, Andrzej J. Buras, Jean-Marc Gérard, David M. Straub

摘要:

我们首次提出了$\varepsilon'/\varepsilon$的主公式,探测$K \to ππ$衰变中直接CP破坏的比率,在标准模型(BSM)之外的任何理论中都有效。该公式利用了最近用对偶QCD方法计算的BSM算符的强子矩阵元和用格点量子色动力学计算的SM算符的强子矩阵元。我们强调几个标量和张量BSM运营商的背景下出现的$\varepsilon'/\varepsilon$异常的巨大影响。我们已经在开源代码flavio中实现了结果。

英文摘要:

We present for the first time a master formula for $\varepsilon'/\varepsilon$, the ratio probing direct CP violation in $K \to ππ$ decays, valid in any theory beyond the Standard Model (BSM). The formula makes use of hadronic matrix elements of BSM operators calculated recently in the Dual QCD approach and the ones of the SM operators from lattice QCD. We emphasize the large impact of several scalar and tensor BSM operators in the context of the emerging $\varepsilon'/\varepsilon$ anomaly. We have implemented the results in the open source code flavio.

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