Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CKM Substructure   The CKM matrix is not generic. The Wolfenstein parametrization encodes
structure by having one small parameter, $\lambda \approx 0.22$. 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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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: q-bio