# LIB2-063 — The framework-angle Route-B readout gives the corrected Cabibbo value

- 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.51)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The data-selected Route-B readout |Vus| = sin θ12/√6 gives 0.225256 when the framework solar angle is used.

## Caution

A derived block weight does not make the data-selected route a first-principles prediction.

## Primary source

Paper 3, §2, Route-B readout, PDF p.48: "The CKM first row is canonically fixed by the Peirce J12 block through Route B: PMNS sin θ12 |Vus | = √ ≈ 0.22526. (1) 6"

## Machine

- url: /library-v2/LIB2-063/
- content_sha256: b2fb35516ed4ae59dd411b6a67ce3a6f9508982f8cffc7d4c3190f242613ac4c
- candidate_ids: C2-009 C2-062

## Freshness

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