{
  "abstract": "The mono-photon process $e^+e^- \\to γ+\\mathrm{invisible}$ at Belle II probes both invisible new states and the electroweak couplings of neutrinos. In this work, we study the process $e^+e^- \\to γν\\barν$, finding that Belle II with the full expected dataset can determine the neutrino-sensitive effective weak mixing angle to a 3.6$\\%$ relative statistical precision, competitive with existing neutrino probes at other energy scales. Polarized beams, as proposed for the Chiral Belle upgrade, separate the neutral- and charged-current contributions and provide independent access to each, giving a handle on the chiral structure of the neutrino gauge interactions. The same process is an irreducible background to dark boson searches, producing a neutrino fog once the luminosity exceeds 1 ab$^{-1}$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.00121",
  "author_total": 4,
  "authors": [
    {
      "name": "Carlos Henrique de Lima"
    },
    {
      "name": "David McKeen"
    },
    {
      "name": "Afif Omar"
    },
    {
      "name": "Douglas Tuckler"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7ar08b398vfdh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.00121",
  "fulltext_url": null,
  "id": "7ar08b398vfdh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.00121",
  "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": [
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7206207662",
  "pdf_url": "https://arxiv.org/pdf/2609.00121",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7ar08b398vfdh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2609.00121",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.00121"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Neutrino Electroweak Couplings and the Neutrino Fog at Belle II",
  "title_text": "Neutrino Electroweak Couplings and the Neutrino Fog at Belle II",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/7ar08b398vfdh",
  "venue": "arXiv",
  "versions": []
}