# LIB2-220 — SL-17: Direct/MC top-mass 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.325)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The ledger’s direct/MC top-mass comparator is 172.60 ± 0.27 GeV, distinct from the cross-section pole mass and not an MS-bar mass.

## Primary source

Appendix X, Honest precision summary, top-quark comparator, PDF p.345: "PDG 2026 direct-measurement (MC) mass 172.60 ± 0.27 GeV (the cross-section pole mass is a distinct object)"

## Machine

- url: /library-v2/LIB2-220/
- content_sha256: 633449e91a4df71c71951b7120831f01151310603120e8af7f6460f9bfb5b0f8
- candidate_ids: C2-195

## Freshness

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