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arXiv 2111.04519hep-phhep-exnucl-th
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解释Cabibbo角异常

Explaining the Cabibbo Angle Anomaly

Claudio Andrea Manzari

摘要:

Cabibbo-Cobayashi-Maskawa(CKM)矩阵参数化了标准模型中上夸克和下夸克质量基之间的失配。第一行CKM么正性破坏的观测最近出现作为SM的新异常,称为“Cabibbo Angle Anomaly”(CAA)。用当前的测量结果,比较从β和K介子衰变中分别提取的元素$V_{ud}$和$V_{us}$,用SM预言的张力值为$\sim$ $3\,σ$ .最近,有人指出,一旦假设CKM为幺正,这种异常也可以被看作是从μ子衰变与$β$和K衰变确定费米常数的差异。事实上,用新物理学的术语可能的解释可以分为两大类:对$β$衰变和/或对$μ$衰变的贡献。在这篇论文中,我们讨论了这些解决方案的规范不变尺寸6运营商在SMEFT和简化的标准模型的扩展。后者可以引入与SM中其他异常的相关性,为模型构建指明新的有趣方向。

英文摘要:

The Cabibbo-Cobayashi-Maskawa (CKM) matrix parametrizes the misalignement between the up- and down-quark mass basis in the Standard Model (SM). The observation of first row CKM unitarity violation has recently emerged as a new anomaly of the SM, known as the "Cabibbo Angle Anomaly" (CAA). With current measurements, comparing the elements $V_{ud}$ and $V_{us}$ extracted from beta and kaon decays respectively, the tension with the SM prediction amounts to $\sim$$3\,σ$. Recently, it has been pointed out that this anomaly can also be seen as a discrepancy in the determination of the Fermi constant from muon decay vs $β$ and K decays, once CKM unitarity is assumed. In fact, possible explanations in terms on New Physics fall under two broad classes: contributions to $β$ decay and/or to $μ$ decay. In this proceedings, we discuss these solutions in terms of gauge invariant dimension 6 operators in SMEFT and simplified extensions of the Standard Model. The latter could introduce correlations with other anomalies in the SM, pointing to new and interesting directions for model building.

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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