{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"4a68b4ad4ca44a0412d42e1d0b72be9a158f15e84d34a0ec0ba16d5fe696bad0","created":"2026-10-03T07:18:07Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"fdf09dbafdbc58710f6fedf595145fc380e65f5b6d063b12ea804ac56fcf214b","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"nuc.neutrino-nucleus.cp-phase-systematics","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"DUNE (Deep Underground Neutrino Experiment) and Hyper-Kamiokande will compare how neutrinos and antineutrinos change type to look for a difference between matter and antimatter. If the nuclear models wrongly predict how neutrinos and antineutrinos interact, the measured asymmetry could be shifted.","posed_since":"","precise":"Determine whether residual cross-section model errors after near-detector constraints (axial form factor, 2p2h, pion production, $\\nu$ versus antineutrino and $\\nu_e$ versus $\\nu_\\mu$ differences) shift the fitted $\\delta_{\\mathrm{CP}}$ by more than its statistical uncertainty at full DUNE and Hyper-Kamiokande exposure. The answer is the size of the bias in degrees for realistic alternative nuclear models, obtained from mock-data studies that use models outside the fitting model's freedom.","problem_ref":null,"references":"","settled_by":"Mock-data oscillation fits with independent nuclear models, plus near-detector and electron-scattering constraints that reduce the induced $\\delta_{\\mathrm{CP}}$ bias below the statistical error.","status_note":"T2K and NOvA published a first joint oscillation analysis in Nature in 2025; DUNE and Hyper-Kamiokande had not taken beam data as of 2026.","title":"Can nuclear uncertainties bias DUNE and Hyper-Kamiokande CP-phase 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