CKM substructure

Yuval Grossman, Joshua T. Ruderman

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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 O(10 %) accident.

Original languageEnglish
Article number143
JournalJournal of High Energy Physics
Issue number1
StatePublished - Jan 2021
Externally publishedYes

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© 2021, The Author(s).


  • Phenomenological Models


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