{
  "abstract": "In atmospheric neutrino analyses, the usable zenith-angle range is generally restricted to upward-going events to suppress the cosmic-ray muon background. Motivated by the exceptionally low underground muon background at the China Jinping Underground Laboratory (CJPL), we investigate whether extending the zenith-angle acceptance can improve the sensitivity of atmospheric neutrino oscillation measurements. An existing 1725 m$^{3}$ liquid-nitrogen volume is adopted as the basis of a simplified detector model, in which the accepted zenith-angle range is extended from $\\cosθ_μ\\in[-1,0]$ to $\\cosθ_μ\\in[-1,0.3]$, and the projected oscillation sensitivity is evaluated for a 10-year exposure. The atmospheric neutrino flux is estimated by interpolating standard flux predictions as a function of geomagnetic latitude. Neutrino interactions in the surrounding rock and the liquid-nitrogen volume are simulated for neutrino energies of $E\\ge0.1$ GeV, followed by secondary-particle transport and geometry-based event selection. For the benchmark oscillation parameters $Δ$m$^{2}_{32}$ = $2.4\\times10^{-3}\\ \\mathrm{eV}^{2}$ and $\\sin^{2}θ_{23}=0.5$, the neutrino-induced muon flux from the surrounding rock is estimated to be $(3.65 \\pm 1.00)\\times10^{-13}$ cm$^{-2}$ s$^{-1}$ sr$^{-1}$, corresponding to a muon yield of $(0.13 \\pm 0.034)$ day$^{-1}$ in the 1725 m$^{3}$ liquid-nitrogen volume. Three-flavor neutrino oscillations are incorporated into a Poisson-likelihood $χ^{2}$ analysis to evaluate the sensitivity to the oscillation parameters. Extending the usable zenith-angle range leads to a clear improvement in the projected oscillation sensitivity at the 90\\% confidence level over a 10-year exposure.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39251",
  "author_total": 10,
  "authors": [
    {
      "name": "Xiao-Yu Peng"
    },
    {
      "name": "Shin-Ted Lin"
    },
    {
      "name": "Shu-Kui Liu"
    },
    {
      "name": "Hao-Yang Xing"
    },
    {
      "name": "Jing-Jun Zhu"
    },
    {
      "name": "Han-Yu Li"
    },
    {
      "name": "Bi-Jun Xiao"
    },
    {
      "name": "Li-Tao Yang"
    },
    {
      "name": "Qian Yue"
    },
    {
      "name": "Muhammed Deniz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3vsby6c6t7eqp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39251",
  "fulltext_url": null,
  "id": "3vsby6c6t7eqp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39251",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.39251",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-30",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3vsby6c6t7eqp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:49Z",
      "native_id": "2609.39251",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39251"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Projected Sensitivity to Atmospheric Neutrino Oscillations using a 1725 m$^{3}$ Liquid-Nitrogen Detector at CJPL",
  "title_text": "Projected Sensitivity to Atmospheric Neutrino Oscillations using a 1725 m^3 Liquid-Nitrogen Detector at CJPL",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:49Z",
  "url": "https://research.draconitic.com/paper/3vsby6c6t7eqp",
  "venue": "arXiv",
  "versions": []
}