# LIB2-230 — SL-28: Historical PDG |Vcb| comparator

- class: COMPARATOR · review_state: PUBLISHED · house_tier: not yet assigned
- labels as printed: math_status NOT_PRINTED · attachment NOT_PRINTED · scorecard tier word none (PDF p.48)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The historical comparator for |Vcb| was 0.0408 ± 0.0014 and is retained only as the earlier value in the printed comparator transition.

## Primary source

Paper 3, §2.1, Comparator refresh: historical Vcb value, PDF p.50: "The named CKM comparators move: |Vcb | 0.0408 ± 0.0014 → 0.0407 ± 0.0013"

## Machine

- url: /library-v2/LIB2-230/
- content_sha256: 74fcbe99b1bd8e6e9049cff50ab30a77baf3934fb95d67065c55752c9abb8e8b
- candidate_ids: C2-206

## Freshness

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