{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"8c36f44cc64e0f5b100d61854b36518ba5fe2475e8b8f2b460066289c99786d0","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","f2fd625d59d7f16de6c9938a318adbfef447971306cebad7aab6c19788fc4128"],"salt":"fa968e4c44f3ec5d03612c2af61c33d9ffcc43c89311a3f434f032efb54f9207","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":["ai:gpt-5.5"],"external_id":"hep.neutrino-mass.cp-phase","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"If neutrinos and antineutrinos oscillate differently, leptons break the matter-antimatter mirror symmetry called CP. This may link to why the universe contains matter.","posed_since":"","precise":"Measure the PMNS phase $\\delta_{\\mathrm{CP}}$ and determine whether $\\sin(\\delta_{\\mathrm{CP}}) \\ne 0$ at $\\ge 5\\sigma$ using $\\nu_{\\mu} \\to \\nu_e$ versus $\\mathrm{anti}-\\nu_{\\mu} \\to \\mathrm{anti}-\\nu_{e}$ appearance. Answer: $\\delta_{\\mathrm{CP}}$ with uncertainty $\\sim 10\\text{ to }20\\ \\mathrm{deg}$ and the yes-no CP verdict.","problem_ref":"f2fd625d59d7f16de6c9938a318adbfef447971306cebad7aab6c19788fc4128","references":"","settled_by":"DUNE and Hyper-Kamiokande appearance data over about 10 years, after the mass ordering is fixed.","status_note":"The 2025 NOvA plus T2K joint analysis (Nature) excludes CP conservation at about $3\\sigma$ only if the ordering is inverted; for normal ordering CP conservation remains allowed.","title":"Do neutrino oscillations violate CP 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