{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"85413a3269261e88b25d0362a3d12f83d4b4c080701aa7af7a335c54afd0c6f0","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d1ca609ba27db4f2b1286cee74005ca00ca92cd532b2bb8bdd1475fee498366c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"hep.electroweak-anomalies.w-mass","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"In 2022 the CDF experiment reported a W boson mass well above the SM prediction. Later measurements at the LHC agree with the SM, leaving the CDF result unexplained.","posed_since":"2022","precise":"CDF (2022) measured $m_{W} = 80433.5 \\pm 9.4\\,\\mathrm{MeV}$, about $7\\,\\sigma$ above the electroweak fit $80357 \\pm 6\\,\\mathrm{MeV}$; ATLAS (2024, $80366.5 \\pm 15.9\\,\\mathrm{MeV}$) and CMS (2024, $80360.2 \\pm 9.9\\,\\mathrm{MeV}$) agree with the SM. Identify the source of the CDF discrepancy (PDF, recoil modeling, detector calibration) or show it reflects new physics.","problem_ref":null,"references":"","settled_by":"A joint Tevatron-LHC reanalysis with common PDFs and modeling, plus further LHC and future $e+e-$ threshold measurements of $m_W$.","status_note":"After the 2024 CMS result the SM value is favored; the CDF disagreement has no accepted explanation.","title":"What explains the CDF W mass measurement 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