{
  "abstract": "Conventional estimates of $J/ψ$ weak decays, based on independent single-charm decays, suggest a branching fraction of order $10^{-8}$. Searches with samples of approximately $10^{10}$ $J/ψ$ events have so far yielded upper limits on exclusive modes. We calculate the inclusive weak branching fraction using the optical theorem, including single-charm decay, charged- and neutral-current annihilation, and their interference. The heavy-quark expansion identifies the leading pair-annihilation structure and motivates vacuum saturation for the leading color-singlet component. With tree-level hard kernels and leading-logarithmic Wilson coefficients at $μ_0=M_{J/ψ}$, we obtain $B_{\\rm weak}=(7.96^{+3.43}_{-0.43}\\pm1.24)\\times10^{-8}$. The contribution mediated by the $W$ boson alone, i.e. single-charm decays and $W$-exchange annihilation without the $W$-$Z$ interference, has a branching fraction of $(2.37^{+1.64}_{-0.42}\\pm0.13)\\times10^{-8}$. For the flavor sectors $(ΔC,|ΔS|)=(0,1)$ and $|ΔC|=1$, the branching fractions are $(4.97^{+16.44}_{-4.97}\\pm0.99)\\times10^{-10}$ and $(1.86^{+0.20}_{-0.06}\\pm0.02)\\times10^{-8}$, respectively, including charge-conjugate channels. The first uncertainty estimates missing perturbative corrections through scale variation over $1~\\mathrm{GeV}\\leqμ\\leq3M_{J/ψ}$. The second is a hadronic uncertainty, obtained by jointly varying each vacuum-saturation and kinetic/chromomagnetic input within relative ranges of $Λ_{\\rm QCD}/m_c\\simeq20\\%$. Pair annihilation dominates, with a substantial neutral-current contribution and scale-sensitive $W$-$Z$ interference.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.30649",
  "author_total": 3,
  "authors": [
    {
      "name": "Lan-Bin Li"
    },
    {
      "name": "Chia-Wei Liu"
    },
    {
      "name": "Peng-Yuan Zheng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e8cxf8pecksc2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.30649",
  "fulltext_url": null,
  "id": "e8cxf8pecksc2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.30649",
  "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|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7223322944",
  "pdf_url": "https://arxiv.org/pdf/2610.30649",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e8cxf8pecksc2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.30649",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.30649"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Inclusive weak decays of the $J/ψ$: single-charm decay and weak annihilation",
  "title_text": "Inclusive weak decays of the J/ψ: single-charm decay and weak annihilation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/e8cxf8pecksc2",
  "venue": "arXiv",
  "versions": []
}