{
  "abstract": "We report an improved measurement of neutrino oscillation parameters at the Jiangmen Underground Neutrino Observatory (JUNO) and the consequent indication of neutrino mass ordering. The analysis is based on 207.2 live days of data, comprising 8,294 inverse beta-decay candidates collected at an average reactor baseline of 52.5 km. A world-leading precision of approximately 1% was achieved for the atmospheric neutrino mass splitting $Δm^2_{31}$, with $Δm^2_{31}=+2.509^{+0.027}_{-0.025}\\times10^{-3}\\,\\mathrm{eV}^2$ for normal ordering and $Δm^2_{31}=-2.482^{+0.025}_{-0.026}\\times10^{-3}\\,\\mathrm{eV}^2$ for inverted ordering, using the Daya Bay constraint in the fit to resolve the correct physical minimum under each mass-ordering hypothesis. We further improved the world's most precise measurements of the solar oscillation parameters, obtaining $\\sin^2θ_{12}=0.3036\\pm0.0064$ and $Δm^2_{21}=(7.388\\pm0.078)\\times10^{-5}\\,\\mathrm{eV}^2$, corresponding to relative precisions of 2.1% and 1.1%, respectively. Incorporating constraints on $Δm^2_{31}$ from long-baseline accelerator neutrino experiments into our analysis favored normal ordering over inverted ordering, with a one-sided significance of at least $2.1σ$ across all possible CP-violating phases; a Bayesian analysis yielded a Bayes factor of 10.18 in favor of normal ordering.",
  "abstract_shown": true,
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  "article_type": null,
  "arxiv": "2609.37895",
  "author_total": 575,
  "authors": [
    {
      "name": "Thomas Adam"
    },
    {
      "name": "Timo Ahola"
    },
    {
      "name": "Nurbakyt Amanbek"
    },
    {
      "name": "Fengpeng An"
    },
    {
      "name": "João Pedro Athay de Marcondes de André"
    },
    {
      "name": "Costas Andreopoulos"
    },
    {
      "name": "Giuseppe Andronico"
    },
    {
      "name": "Nikolay Anfimov"
    },
    {
      "name": "Vito Antonelli"
    },
    {
      "name": "Tatiana Antoshkina"
    },
    {
      "name": "Manuel Böhles"
    },
    {
      "name": "Marcel Büchner"
    },
    {
      "name": "Nikita Balashov"
    },
    {
      "name": "Andrea Barresi"
    },
    {
      "name": "Davide Basilico"
    },
    {
      "name": "Eric Baussan"
    },
    {
      "name": "Marco Beretta"
    },
    {
      "name": "Antonio Bergnoli"
    },
    {
      "name": "Nikita Bessonov"
    },
    {
      "name": "Daniel Bick"
    },
    {
      "name": "Lukas Bieger"
    },
    {
      "name": "Svetlana Biktemerova"
    },
    {
      "name": "Thilo Birkenfeld"
    },
    {
      "name": "Simon Blyth"
    },
    {
      "name": "Anastasia Bolshakova"
    },
    {
      "name": "Mathieu Bongrand"
    },
    {
      "name": "Aurélie Bonhomme"
    },
    {
      "name": "Matteo Borghesi"
    },
    {
      "name": "Augusto Brigatti"
    },
    {
      "name": "Riccardo Brugnera"
    },
    {
      "name": "Riccardo Bruno"
    },
    {
      "name": "Jonas Buchholz"
    },
    {
      "name": "Antonio Budano"
    },
    {
      "name": "Jose Busto"
    },
    {
      "name": "Anatael Cabrera"
    },
    {
      "name": "Barbara Caccianiga"
    },
    {
      "name": "Hao Cai"
    },
    {
      "name": "Xiao Cai"
    },
    {
      "name": "Yi-Zhou Cai"
    },
    {
      "name": "Stéphane Callier"
    },
    {
      "name": "Antonio Cammi"
    },
    {
      "name": "Guofu Cao"
    },
    {
      "name": "Jun Cao"
    },
    {
      "name": "Yaoqi Cao"
    },
    {
      "name": "Rossella Caruso"
    },
    {
      "name": "Aurelio Caslini"
    },
    {
      "name": "Cédric Cerna"
    },
    {
      "name": "Vanessa Cerrone"
    },
    {
      "name": "Jinfan Chang"
    },
    {
      "name": "Milo Charavet"
    },
    {
      "name": "Tim Charisse"
    },
    {
      "name": "Chao Chen"
    },
    {
      "name": "Haotian Chen"
    },
    {
      "name": "Jiahui Chen"
    },
    {
      "name": "Jian Chen"
    },
    {
      "name": "Jing Chen"
    },
    {
      "name": "Junyou Chen"
    },
    {
      "name": "Pingping Chen"
    },
    {
      "name": "Shaomin Chen"
    },
    {
      "name": "Shiqiang Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dtpcgs9b1wmeg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.37895",
  "fulltext_url": null,
  "id": "dtpcgs9b1wmeg",
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  "landing_url": "https://hal.science/hal-05781906v1",
  "language": "en",
  "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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      "hal",
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    [
      "openalex",
      "3106|Neutrino Physics Research"
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  "openalex": "W7214980071",
  "pdf_url": "https://arxiv.org/pdf/2609.37895",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dtpcgs9b1wmeg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:49Z",
      "native_id": "hal-05781906",
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      "url": "https://hal.science/hal-05781906v1"
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    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.37895",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.37895"
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Measurement of Neutrino Oscillation Parameters at JUNO and Indication of the Neutrino Mass Ordering",
  "title_text": "Measurement of Neutrino Oscillation Parameters at JUNO and Indication of the Neutrino Mass Ordering",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/dtpcgs9b1wmeg",
  "venue": "HAL",
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}