# LIB2-276 — Superseded resummed-electromagnetic charm formula

- 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 charm prompt proposed obtaining its mass from the top mass and a resummed electromagnetic-coupling factor.

## Caution

Replacing this formula does not establish a general electromagnetic-resummation no-go or complete the present mass-scheme conversion.

## Primary source

Paper 2, §3.6, Current charm boundary value and offset, PDF p.38: "The charm bridge value mc = 1291.9 MeV lies +1.49% above the PDG 2026 MS comparator mc (mc ) = 1272.9 ± 4.5 MeV."

## Machine

- url: /library-v2/LIB2-276/
- content_sha256: 66dca5d974252a5eaa6c10cfbf6d6bb6610bbae0d308c0e09ffc30a603c3a327
- candidate_ids: C2-022

## Freshness

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