The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3) x 10²⁰ protons on target in (anti)neutrino mode, the analysis finds a 1.9𝜎 exclusion of 𝐶𝑃 conservation (defined as 𝐽_𝐶𝑃 = 0) and a 1.2𝜎 exclusion of the inverted mass ordering.

The Super-Kamiokande (SK) experiment measures atmospheric neutrino oscillations using a large multipurpose water Cherenkov detector located in the Kamioka mine in Gifu, Japan.

The Tokai-to-Kamioka (T2K) long-baseline neutrino experiment measures neutrino oscillations over a baseline of 295 km using a primarily muon (anti)neutrino beam produced by the neutrino facility at J-PARC, located in Ibaraki, Japan.

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