{
  "abstract": "XENONnT has measured a low-energy solar-neutrino signal dominated by $pp$ neutrinos. At these energies, an ultra-small pseudo-Dirac mass-squared splitting induces detectable active-sterile oscillations over the Sun--Earth baseline. We study pseudo-Dirac oscillations of the first mass eigenstate, compute the resulting modification of the $pp+{}^7$Be electron-recoil spectrum, and construct a likelihood from the published XENONnT energy spectra. We find that the XENONnT data exclude $5.9\\times10^{-13}\\,\\mathrm{eV}^2\\lesssim δm_1^2 \\leq 10^{-11}\\,\\mathrm{eV}^2$ at the $2σ$ level, extending current solar-neutrino sensitivity to smaller mass splittings and approaching a regime previously discussed for future $pp$-sensitive detectors.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.38233",
  "author_total": 1,
  "authors": [
    {
      "name": "Gio Leone"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/99e6x2jatr01m.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.38233",
  "fulltext_url": null,
  "id": "99e6x2jatr01m",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.38233",
  "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-ph"
    ],
    [
      "openalex",
      "3106|Neutrino Physics Research"
    ]
  ],
  "openalex": "W7215056941",
  "pdf_url": "https://arxiv.org/pdf/2609.38233",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/99e6x2jatr01m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2609.38233",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.38233"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "XENONnT $pp$-Dominated Solar Neutrinos Constrain the $ν_1$ Pseudo-Dirac Splitting",
  "title_text": "XENONnT pp-Dominated Solar Neutrinos Constrain the ν_1 Pseudo-Dirac Splitting",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/99e6x2jatr01m",
  "venue": "arXiv",
  "versions": []
}