{
  "abstract": "We systematically investigate the Dalitz decays of vector heavy quarkonia into $χ_{QJ}(1P)\\ell^+\\ell^-$ ($Q=c,b$; $J=0,1,2$; $\\ell=e,μ$) within the instantaneous Bethe--Salpeter framework. The study covers $ψ(2S)$, $ψ(1D)$, $Υ(2S)$, and the so-far unobserved $Υ(1D)$ states. For $ψ(2S)$ electron channels, our predictions are in excellent agreement with BESIII data. We further provide the first relativistic predictions for $ψ(1D)$ decays, with branching ratios for several electron channels reaching the $10^{-5}$ level, which is accessible at current BESIII statistics. For bottomonium, $Υ(2S)\\toχ_{bJ}e^+e^-$ decays yield branching fractions of $\\mathcal{O}(10^{-4})$, suggesting potential observability at Belle~II. Muonic channels are also discussed, with kinematic constraints carefully addressed. Our results establish a coherent theoretical basis for future experimental searches for heavy quarkonium Dalitz decays.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.14897",
  "author_total": 6,
  "authors": [
    {
      "name": "Xin-Wen Wang"
    },
    {
      "name": "Wen-Yuan Ke"
    },
    {
      "name": "Su-Yan Pei"
    },
    {
      "name": "Tianhong Wang"
    },
    {
      "name": "Qiang Li"
    },
    {
      "name": "Guo-Li Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6ydqpa2jn9y2b.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.14897",
  "fulltext_url": null,
  "id": "6ydqpa2jn9y2b",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.14897",
  "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"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7213328158",
  "pdf_url": "https://arxiv.org/pdf/2609.14897",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6ydqpa2jn9y2b.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.14897",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.14897"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Dalitz decays of vector heavy quarkonia into $χ_{QJ}(1P)$ in the Bethe-Salpeter approach",
  "title_text": "Dalitz decays of vector heavy quarkonia into χ_QJ(1P) in the Bethe-Salpeter approach",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/6ydqpa2jn9y2b",
  "venue": "arXiv",
  "versions": []
}