{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"524fcc696a315e30d9b24a9221614dc8f80cf459846bf7022094a2e4d72644e0","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["30971b31bcb17615a08b7ea6a019ddb52df0e431d97357991c6f02f8bb1115a4","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"bf2f2fc17161c44f4f5784fdea524ae4fa944364cb5f5b672a9e989dc5af3e64","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":["ai:gpt-5.5"],"external_id":"hep.flavor-puzzle.charged-lfv","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"The SM forbids a muon from turning into an electron without neutrinos, except at hopelessly tiny rates. Seeing it would prove new physics acting on flavor.","posed_since":"","precise":"Measure or bound the coherent conversion rate $R_{\\mathrm{mue}} = \\Gamma(\\mu- N \\to e- N)/\\Gamma(\\mu- \\mathrm{capture})$ on aluminum at single-event sensitivity $\\sim 10^{-17}$ (Mu2e, COMET), versus the SINDRUM II gold limit of about $7 \\times 10^{-13}$. Combine with $\\mu \\to e\\gamma$ (MEG II) and $\\mu \\to 3e$ (Mu3e) to identify the operator responsible if seen.","problem_ref":"30971b31bcb17615a08b7ea6a019ddb52df0e431d97357991c6f02f8bb1115a4","references":"","settled_by":"Mu2e at Fermilab and COMET at J-PARC reaching single-event sensitivity near $10^{-17}$.","status_note":"MEG II reported $\\mathrm{BR}(\\mu \\to e \\gamma) < \\sim 1.5 \\times 10^{-13}$ in 2025 (moderate confidence on the exact value); Mu2e and COMET are expected to start physics running around 2027.","title":"Does muon-to-electron conversion occur at rates near $10^{-16}$?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4f5ce9e21fabc19e4a1576f09e20760a756fa25750e47bfa81c5ff9d11c389ec","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c54a8ee332eb4123b311e21fb21aea0ba502162d8978b1fdd75b05048ff9dca9","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"4vMlMSqR3PM2rT6YyZO662TQFk0KrIYniiBHbbyQuKgHDjHRva1KMnis-RQ7M2PM6P53Phas8HpEAneA_tC4DQ"},"schema":"pubphys.envelope/1"},"record_hash":"4f5ce9e21fabc19e4a1576f09e20760a756fa25750e47bfa81c5ff9d11c389ec","leaf_index":3340}