{
  "access": "open",
  "creators": [
    {
      "kind": "collaboration",
      "name": "T2K Collaboration"
    }
  ],
  "curation": {
    "added": "2026-10-23",
    "quality_notes": ["metadata from DataCite; physics tags assigned by the curator from title and abstract"],
    "source": "wave 1b: DataCite (collaboration / prefix search)",
    "status": "curated"
  },
  "data": {
    "levels": ["summary", "contours"],
    "result_of": "10.1103/physrevlett.116.181801"
  },
  "date_published": "2016",
  "description": "KEK. T2K reports its first measurements of the parameters governing the disappearance of $\\bar{\\nu}_\\mu$ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic $\\bar{\\nu}_\\mu$ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the $\\bar{\\nu}_\\mu$ survival probability is expected to be minimal. Using a dataset corresponding to $4.01 \\times 10^{20}$ protons on target, $34$ fully contained $\\mu$-like events were observed. The best-fit oscillation parameters are $\\sin^2 (\\bar{\\theta}_{23}) = 0.45$ and $|\\Delta\\bar{m}^2_{32}| = 2.51 \\times 10^{-3}$ eV$^2$ with 68% confidence intervals of 0.38 - 0.64 and 2.26 - 2.80 $\\times 10^{-3}$ eV$^2$ respectively. These results are in agreement with existing antineutrino parameter measurements and also with the $\\nu_\\mu$ disappearance parameters measured by T2K.\n\nData points taken from attached tar file available at http://t2k-experiment.org/results/.",
  "distributions": [
    {
      "formats": ["yaml", "csv", "json", "root"],
      "host": "hepdata",
      "role": "primary",
      "url": "https://doi.org/10.17182/hepdata.73984.v1"
    }
  ],
  "doi": "10.17182/hepdata.73984.v1",
  "experiments": ["t2k"],
  "id": "hepdata-t2k-antinumu-disappearance-2016",
  "license": "CC0-1.0",
  "publisher": {
    "kind": "organization",
    "name": "HEPData"
  },
  "references": [
    {
      "doi": "10.1103/physrevlett.116.181801",
      "relation": "describes"
    }
  ],
  "relations": [
    {
      "rel": "is_part_of",
      "target": "hepdata"
    }
  ],
  "short": "HEPData: T2K first ν̄μ disappearance measurement (2016)",
  "sources": ["accelerator"],
  "title": "Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam",
  "topics": ["oscillation"],
  "type": "dataset",
  "url_landing": "https://www.hepdata.net/record/ins1408741?version=1",
  "version": "1"
}