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arXiv 2007.12695hep-ph
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CKM子结构

CKM Substructure

Yuval Grossman, Joshua T. Ruderman

摘要:

CKM矩阵不是通用的。Wolfenstein参数化通过一个小参数$λ\approx 0.22$对结构进行编码。我们提出的问题:是否有子结构的CKM矩阵,超出了一个小参数的Wolfenstein参数化?我们找到了两个近似满足的关系:$|V_{td}|^2 = |V_{cb}|^3$和$|V_{ub}|^2 |V_{us}| = |V_{cb}|^4$。我们讨论了这些关系的统计意义,并发现它们可能表明更深层次的结构中的CKM矩阵。但是,当前精度不能排除$\mathcal{O}(10 \%)$事故。

英文摘要:

The CKM matrix is not generic. The Wolfenstein parametrization encodes structure by having one small parameter, $λ\approx 0.22$. We pose the question: is there substructure in the CKM matrix that goes beyond the single small parameter of the Wolfenstein parameterization? We find two relations that are approximately satisfied: $|V_{td}|^2 = |V_{cb}|^3$ and $|V_{ub}|^2 |V_{us}| = |V_{cb}|^4$. We discuss the statistical significance of these relations and find that they may indicate deeper structure in the CKM matrix. The current precision, however, cannot exclude an $\mathcal{O}(10 \%)$ accident.

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