# LIB2-219 — SL-16: MS-bar bottom mass at its self-scale

- 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.37)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The ledger’s MS-bar bottom-mass comparator at the bottom self-scale is mb(mb) = 4186 ± 6 MeV.

## Primary source

Paper 2, §3.6, Bottom MS-bar comparator and cross-scheme boundary, PDF p.38: "against PDG 2026 mb (mb ) = 4186 ± 6 MeV"

## Machine

- url: /library-v2/LIB2-219/
- content_sha256: d3bc0a2e88cdad06336ffb745a6f5190d74a46962b5a7efbfd9b257112f34344
- candidate_ids: C2-194

## Freshness

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