Abstract
The CKM matrix is not generic. The Wolfenstein parametrization encodes structure by having one small parameter, λ ≈ 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: |Vtd|2 = |Vcb|3 and |Vub|2|Vus| = |Vcb|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 \( \mathcal{O}\left(10\%\right) \) accident.
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Grossman, Y., Ruderman, J.T. CKM substructure. J. High Energ. Phys. 2021, 143 (2021). https://doi.org/10.1007/JHEP01(2021)143
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DOI: https://doi.org/10.1007/JHEP01(2021)143