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arXiv 1811.03332hep-ph
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K介子系统中$CP$直接破坏的最新进展及其与$K \to πν\barν$测量的联系

Recent developments on direct $CP$ violation in the kaon system and connection to $K \to πν\barν$ measurements

Teppei Kitahara

摘要:

RBC和UKQCD合作的第一个格子结果和改进的微扰计算$\varepsilon^{\prime}_K / \varepsilon_K$暗示,标准模型(SM)的期望偏离测量值在$2.8\,σ$水平。由于$\varepsilon^{\prime}_K / \varepsilon_K$来自于$CP$违反的FCNC,并且在SM中被显著抑制,因此可以在几个新的物理(NP)模型中容易地解释这种差异。在这方面的贡献,它表明,与其他罕见的衰变,特别是$K\to πν\overlineν$和$K_S \to μ^+ μ^-$的相关性,是至关重要的判别NP模型。这些通道可以在将来通过用于$K\to πν\overlineν$的NA62和KOTO实验以及用于$K_S \to μ^+ μ^-$的LHCb实验精确地探测。

英文摘要:

The first lattice result from the RBC and UKQCD Collaborations and improved perturbative calculations of $\varepsilon^{\prime}_K / \varepsilon_K$ have implied that the Standard-Model (SM) expectation deviates from measured values at the $2.8\,σ$ level. Since $\varepsilon^{\prime}_K / \varepsilon_K$ comes from $CP$-violating FCNC and is significantly suppressed in the SM, the discrepancy can be explained easily in several new physics (NP) models. In this contribution, it is shown that correlations with the other rare decays, especially $K\to πν\overlineν$ and $K_S \to μ^+ μ^-$, are crucial for discrimination of the NP models. These channels can be probed precisely in the future by the NA62 and KOTO experiments for $K\to πν\overlineν$ and LHCb experiment for $K_S \to μ^+ μ^-$.

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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