{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f74e7e7ba6d9762ee68fd76c6f2414eeada27d913b15447b83a8e8e12ddf08ac","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"a06c2a126ad92dc928106100b1f274adf20757702af68ff509dd775a2d4c9242","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"hep.electroweak-anomalies.muon-g2-residual","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"The muon behaves like a tiny magnet whose strength was measured to about one part in ten million. The SM prediction now agrees, but only after replacing one method of computing the strong-force part with another.","posed_since":"2001","precise":"Fermilab's final result (2025) gives $a_{\\mu} = 116592070.5(14.8) x 1e-11\\ (127\\ \\mathrm{ppb})$; the world average with BNL is $116592071.5(14.5) x 1e-11\\ (124\\ \\mathrm{ppb})$; the 2025 Theory Initiative prediction using lattice-QCD HVP (hadronic vacuum polarization) is $116592033(62) x 1e-11$, in agreement. The residual question is whether the SM prediction with uncertainty $\\sim 20 x 1e-11$ still agrees once data-driven and lattice HVP are reconciled.","problem_ref":null,"references":"","settled_by":"Lattice HVP at $\\sim 0.2\\ \\mathrm{percent}$ from several groups, consistent $e+e-$ hadronic data, the MUonE spacelike HVP measurement, and the J-PARC muon $g-2$ experiment.","status_note":"In 2025 the long-standing $4\\ \\text{to}\\ 5\\,\\sigma$ discrepancy disappeared with the lattice-based SM value; the data-driven value remains inconsistent.","title":"Does the SM match the final muon g-2 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