# LIB2-067 — The Vub hierarchy relation inherits the loaded Route-B chain

- class: CLAIM · review_state: PUBLISHED · house_tier: not yet assigned
- labels as printed: math_status NOT_PRINTED · attachment NOT_PRINTED · scorecard tier word Loaded (PDF p.58)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The retained hierarchy relation |Vub| = |Vus||Vcb|/√6 gives 0.003862 within the loaded Route-B correspondence.

## Caution

The hierarchy relation does not remove the route choice or supply an independent derivation of the full CKM matrix.

## Primary source

Appendix B, §B.6, Vub hierarchy and displayed comparison, PDF p.162: "|Vub | |Vus ||Vcb |/ 6 = 0.003862 0.00389 ± 0.00016 −0.18σ"

## Machine

- url: /library-v2/LIB2-067/
- content_sha256: d45d9b1aaa18bd779c9c09322a492974096547c5c4b3024586c47711cd47d53a
- candidate_ids: C2-011 C2-064

## Freshness

- BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02
- Declared volatile fields (R36): BUILD_STAMP