{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"71aaf97b71a3c5c00d9a0a1cd84d28ff473838690954cb82cc63f637b0392043","created":"2026-10-03T07:18:05Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"407feb95911f6390ba469c2114763866423418c79742d99044ce97cb61fb69a0","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"hep.neutrino-mass.cp-phase","kind":"well-posed","literature_status":"open","n":"1","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 $\\operatorname{sin}(\\delta_{\\mathrm{CP}}) \\ne 0$ at $\\ge 5\\sigma$ using $\\nu_{\\mu} \\to \\nu_e$ versus anti-nu_mu -> 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":null,"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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