{
  "abstract": "Within the NRQCD factorization framework, we investigate the color-singlet contribution to $e^+e^- \\to J/ψ+ X_{{\\rm non\\,}c\\bar{c}}$ at B factories, computing the $\\mathcal{O}(α_s)$, $\\mathcal{O}(v^2)$, and $\\mathcal{O}(α_s v^2)$ corrections to both the unpolarized cross section and the $J/ψ$ angular distribution. The $\\mathcal{O}(α_s v^2)$ correction is obtained for the first time, and the validity of NRQCD factorization at this order is explicitly verified. Using the differential equation method, the short-distance coefficients are obtained as asymptotic expansions in $r = m_c/\\sqrt{s}$ up to $r^{40}$, which reproduce exact results with high precision at B factory energies, achieving relative errors around $10^{-14}$ for the cross section and around $10^{-7}$ for the angular distribution. Notably, with the same input parameters, our $\\mathcal{O}(α_s)$ and $\\mathcal{O}(v^2)$ corrections are consistent with those reported in the literature. Phenomenologically, the $\\mathcal{O}(α_s)$ correction (with $μ_R=\\sqrt{s}/2$) reaches about $50\\%$ of the leading-order cross section, while the $\\mathcal{O}(v^2)$ and $\\mathcal{O}(α_s v^2)$ corrections are accidentally small. After including feeddown contributions from $ψ(2S)$, the predicted cross section $0.523_{-0.197}^{+0.285}$ pb agrees with the {\\tt Belle} measurement within uncertainties. However, the predicted angular distribution parameter $0.120_{-0.036}^{+0.041}$ deviates from the experimental value $5.71\\pm 2.51$ by more than $2σ$, calling for further experimental and theoretical investigations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.17827",
  "author_total": 4,
  "authors": [
    {
      "name": "Cong Li"
    },
    {
      "name": "Hao-Yang Liu"
    },
    {
      "name": "Xu-Dong Huang"
    },
    {
      "name": "Wen-Long Sang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/87sqe23pz3r2k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.17827",
  "fulltext_url": null,
  "id": "87sqe23pz3r2k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.17827",
  "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": "W7164989282",
  "pdf_url": "https://arxiv.org/pdf/2606.17827",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/87sqe23pz3r2k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2606.17827",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.17827"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Semi-analytical results for $e^+e^-\\to J/ψ+ X_{{\\rm non\\,}c\\bar{c}}$ up to $\\mathcal{O}(α_s v^2)$ at B factories",
  "title_text": "Semi-analytical results for e^+e^-→ J/ψ+ X_non cc̅ up to 𝒪(α_s v^2) at B factories",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:12Z",
  "url": "https://research.draconitic.com/paper/87sqe23pz3r2k",
  "venue": "arXiv",
  "versions": []
}