# LIB2-130 — The bottom bridge retains its tau anchor and cross-scheme offset

- class: CLAIM · review_state: PUBLISHED · house_tier: not yet assigned
- labels as printed: math_status Structural · attachment NOT_PRINTED · scorecard tier word Structural (PDF p.334)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The retained bottom bridge mb = (7/3)mτ = 4146 MeV has the printed −0.95% offset from the MS-bar comparator, a cross-scheme comparison that sets no status.

## Caution

The bridge is not a derived low-energy MS-bar mass relation, and its comparator distance is not a scheme-matched tension.

## Primary source

Paper 2, §3.6, Bottom comparison and status rule, PDF p.38: "The mb row must be quoted with its offset: mb = (7/3)mτ = 4146 MeV against PDG 2026 mb (mb ) = 4186 ± 6 MeV is −0.95% and dcmp = −6.64 (cross-scheme, no status; full precision, Rev32.9)."

## Machine

- url: /library-v2/LIB2-130/
- content_sha256: 338021a22147d0d3ea4e1b64c7f597a0eed7e5d8052c50938e137828f999f35d
- candidate_ids: C2-021

## Freshness

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