论文标题
解释Cabibbo角异常
Explaining the Cabibbo Angle Anomaly
论文作者
论文摘要
从Kaon，Pion，$ d $和Tau的Cabibbo角度的确定与超允许的beta衰减中的一个分歧不同意。第一行（但也是第一列）CKM Unitarity所得的$ \ 3 \，σ$赤字被称为Cabibbo角异常（CAA）。从beta衰减中确定$ v_ {ud} $需要了解费米常数$ g_f $，通常是从muon衰减中提取的。但是，由于新物理学也可能会影响MUON衰减，因此可以确定费米常数，因此与全球电动型拟合的有趣相互作用是在$ g_f $是至关重要的情况下出现的。在这些程序中，我们在SM之外的物理学方面回顾了CAA及其不同的解释，首先讨论有效的现场理论中的相应效果，然后讨论（简化）模型。
The determinations of the Cabibbo angle from kaon, pion, $D$ and tau decays disagree with the one from super-allowed beta decays. The resulting $\approx 3\,σ$ deficit in first row (but also first column) CKM unitarity is known as the Cabibbo angle anomaly (CAA). Determining $V_{ud}$ from beta decays requires knowledge of the Fermi constant $G_F$, usually extracted from muon decay. However, because new physics might also affect muon decay, and thus the determination of the Fermi constant, an interesting interplay with the global electroweak fit arises where $G_F$ is a crucial input. In these proceedings we review the CAA and its different interpretations in terms of physics beyond the SM, first discussing the corresponding effect in the effective field theory and then using (simplified) models.
