{
  "abstract": "In this work, we compute the next-to-next-to-leading-order (NNLO) QCD corrections to the process $e^+e^-\\to J/ψ+χ_{cJ}$ at B factories within the NRQCD factorization framework. The helicity amplitudes are obtained via asymptotic expansions around $r=0$ and $r=1$, with $r=16m_c^2/s$. Our asymptotic expressions reproduce the exact numerical results with high accuracy across the kinematic range $0\\le r \\le 1$, achieving a relative error below $10^{-5}$, which is sufficient for phenomenological applications. Notably, the large logarithmic terms are obtained analytically, and the explicit expressions established in this work provide a useful basis for further theoretical investigations. We compute the unpolarized cross sections. The $\\mathcal{O}(α_s)$ correction is found to be large, while the $\\mathcal{O}(α_s^2)$ correction for $χ_{c0}$ production amounts to $33\\%$ of the leading-order (LO) cross section, significantly reducing the scale uncertainties. For $χ_{c1}$, the $\\mathcal{O}(α_s)$ and $\\mathcal{O}(α_s^2)$ corrections correspond to $35\\%$ and $-15\\%$, respectively. For $χ_{c2}$, the corresponding corrections are $24\\%$ and $-38\\%$. The large cancellation between the corrections for $χ_{c2}$ brings the NNLO cross section close to the LO prediction. Our prediction for $χ_{c0}$ is consistent with both the {\\tt Belle} and {\\tt BaBar} data within uncertainties. We also predict the angular distribution parameters $α^J_θ$, which are independent of nonperturbative inputs. A sharp discrepancy between the theory and the {\\tt Belle} measurement is observed for $α^0_θ$, calling for further experimental and theoretical investigations. Moreover, future measurements of the angular distribution parameters for $χ_{c1}$ and $χ_{c2}$ will provide important tests of the theoretical framework.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.02182",
  "author_total": 3,
  "authors": [
    {
      "name": "Hao-Yang Liu"
    },
    {
      "name": "Cong Li"
    },
    {
      "name": "Wen-Long Sang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/15k9sscpfh6ap.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.02182",
  "fulltext_url": null,
  "id": "15k9sscpfh6ap",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.02182",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2606.02182",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/15k9sscpfh6ap.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:11Z",
      "native_id": "2606.02182",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.02182"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Semi-analytical two-loop QCD corrections to $e^+e^-\\to J/ψ+χ_{cJ}$ at B factories",
  "title_text": "Semi-analytical two-loop QCD corrections to e^+e^-→ J/ψ+χ_cJ at B factories",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:11Z",
  "url": "https://research.draconitic.com/paper/15k9sscpfh6ap",
  "venue": "arXiv",
  "versions": []
}