{
  "abstract": "We calculate the next-to-next-to-leading-order (NNLO) QCD corrections to direct colour-singlet $J/ψ$ production with open charm at B factories, using nested soft-collinear subtraction for massive partons. At $\\sqrt{s}=10.6$ GeV, $m_c=1.5$ GeV and $μ_R=2m_c$, we obtain an approximate NNLO cross section of $0.324^{+0.041}_{-0.066}$ pb, with scale uncertainties from $m_c\\leqμ_R\\leq4m_c$. The total cross section is $18.4\\%$ above NLO and exhibits good perturbative convergence through NNLO, with reduced scale dependence. An NLO-based mass extrapolation to $m_c=1.4$ GeV, combined with estimated $ψ(2S)$ feed-down, raises the rate to about $0.59$ pb. The NNLO correction brings the absolute momentum spectrum near its peak closer to Belle's prompt open-charm data, but shifts the angular shape further away from Belle's prompt charm-associated data. The difference in angular shape motivates more precise measurements at Belle II.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.39895",
  "author_total": 5,
  "authors": [
    {
      "name": "Xiangyu Chang"
    },
    {
      "name": "Chao Zeng"
    },
    {
      "name": "Bin Gong"
    },
    {
      "name": "Jian-Xiong Wang"
    },
    {
      "name": "Cong Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ccj2gwgsb5y24.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.39895",
  "fulltext_url": null,
  "id": "ccj2gwgsb5y24",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.39895",
  "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-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.39895",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ccj2gwgsb5y24.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.39895",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.39895"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "NNLO QCD corrections to direct $J/ψ$ production with open charm at B factories",
  "title_text": "NNLO QCD corrections to direct J/ψ production with open charm at B factories",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/ccj2gwgsb5y24",
  "venue": "arXiv",
  "versions": []
}