# LIB2-288 — Superseded Cabibbo-squared formula for Vcb

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

## Statement

The archived proof prompt proposed obtaining Vcb from the squared sine of a corrected Cabibbo angle divided by the square root of the golden ratio.

## Caution

Replacing this historical formula does not select the present physical attachment or the unforced integer in its denominator.

## Primary source

Appendix B, §B.6, Retained Vcb formula, PDF p.162: "|Vcb | 1/(9 7) = 0.041996"

## Machine

- url: /library-v2/LIB2-288/
- content_sha256: b7b590373fa19787615d7e3684818d497cd61e822f3f0c900d17d3739497f700
- candidate_ids: C2-010 C2-063

## Freshness

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