{
  "abstract": "We perform a measurement of time-dependent $CP$ violation parameters in $B^{0} \\to K_{S}^{0} π^{0} γ$ decays using a dataset of approximately $772 \\times 10^6$ and $521 \\times 10^6$ $Υ(4S)$ decays collected by the Belle and Belle II experiments, respectively. The measured parameters for the combined dataset in the $K^{*0}(892)$ dominated region ($M_{K_{S}^{0} π^{0}} \\in [0.8,1.0] \\mathrm{GeV}/c^2$) are $S = 0.09 \\pm 0.16 \\pm 0.02$ and $C = -0.09 \\pm 0.08 \\pm 0.04$. For the non-$K^{*0}(892)$ region ($M_{K_{S}^{0} π^{0}} \\in [1.0,1.8] \\mathrm{GeV}/c^2$), the corresponding values are $S = -0.32 \\pm 0.33 \\pm 0.09$ and $C = -0.07 \\pm 0.17 \\pm 0.08$. The first quoted uncertainties are statistical, while the second ones are systematic. These results are consistent with Standard Model predictions and more precise than previous measurements.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: JHEP 09 (2026) 216",
  "arxiv": "2606.04496",
  "author_total": 419,
  "authors": [
    {
      "name": "Belle"
    },
    {
      "name": "Belle II Collaborations"
    },
    {
      "name": "M. Abumusabh"
    },
    {
      "name": "I. Adachi"
    },
    {
      "name": "A. Aggarwal"
    },
    {
      "name": "Y. Ahn"
    },
    {
      "name": "H. Aihara"
    },
    {
      "name": "M. Akdag"
    },
    {
      "name": "N. Akopov"
    },
    {
      "name": "S. Alghamdi"
    },
    {
      "name": "M. Alhakami"
    },
    {
      "name": "N. Althubiti"
    },
    {
      "name": "K. Amos"
    },
    {
      "name": "M. Angelsmark"
    },
    {
      "name": "N. Anh Ky"
    },
    {
      "name": "C. Antonioli"
    },
    {
      "name": "K. Arai"
    },
    {
      "name": "H. Atmacan"
    },
    {
      "name": "T. Aushev"
    },
    {
      "name": "V. Aushev"
    },
    {
      "name": "R. Ayad"
    },
    {
      "name": "V. Babu"
    },
    {
      "name": "H. Bae"
    },
    {
      "name": "N. K. Baghel"
    },
    {
      "name": "S. Bahinipati"
    },
    {
      "name": "P. Bambade"
    },
    {
      "name": "Sw. Banerjee"
    },
    {
      "name": "S. Bansal"
    },
    {
      "name": "M. Barrett"
    },
    {
      "name": "M. Bartl"
    },
    {
      "name": "J. Baudot"
    },
    {
      "name": "A. Beaubien"
    },
    {
      "name": "F. Becherer"
    },
    {
      "name": "J. Becker"
    },
    {
      "name": "G. F. Benfratello"
    },
    {
      "name": "J. V. Bennett"
    },
    {
      "name": "F. U. Bernlochner"
    },
    {
      "name": "V. Bertacchi"
    },
    {
      "name": "M. Bertemes"
    },
    {
      "name": "E. Bertholet"
    },
    {
      "name": "M. Bessner"
    },
    {
      "name": "S. Bettarini"
    },
    {
      "name": "V. Bhardwaj"
    },
    {
      "name": "B. Bhuyan"
    },
    {
      "name": "F. Bianchi"
    },
    {
      "name": "T. Bilka"
    },
    {
      "name": "D. Biswas"
    },
    {
      "name": "A. Bobrov"
    },
    {
      "name": "D. Bodrov"
    },
    {
      "name": "A. Bondar"
    },
    {
      "name": "G. Bonvicini"
    },
    {
      "name": "J. Borah"
    },
    {
      "name": "A. Boschetti"
    },
    {
      "name": "A. Bozek"
    },
    {
      "name": "M. Bračko"
    },
    {
      "name": "P. Branchini"
    },
    {
      "name": "N. Brenny"
    },
    {
      "name": "R. A. Briere"
    },
    {
      "name": "T. E. Browder"
    },
    {
      "name": "A. Budano"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7t0ew11ypg91w.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.04496",
  "fulltext_url": null,
  "id": "7t0ew11ypg91w",
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  "landing_url": "https://arxiv.org/abs/2606.04496",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
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      "hep-ex"
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  "pdf_url": "https://arxiv.org/pdf/2606.04496",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7t0ew11ypg91w.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2606.04496",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.04496"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Measurement of time-dependent $CP$ violation parameters in $B^{0} \\to K_{S}^{0} π^{0} γ$ decays at Belle and Belle II",
  "title_text": "Measurement of time-dependent CP violation parameters in B^0 → K_S^0 π^0 γ decays at Belle and Belle II",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/7t0ew11ypg91w",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1007/jhep09(2026)216",
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      "relation": "published-as",
      "title": null,
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}