{
  "abstract": "Using 44.55 fb$^{-1}$ of $e^+e^-$ collision data collected by the BESIII detector at the BEPCII collider, we report the first measurement of the Born cross sections for the $e^+e^- \\to K^+Ξ^0\\barΣ^-$ reaction at fifty-six center-of-mass energies between 3.51 and 4.95~GeV. A fit to the dressed cross sections reveals the first observation of the $ψ(3770) \\to K^+Ξ^0\\barΣ^-$ process, with a statistical significance of 6.0$σ$ including systematic uncertainties. This result represents the first observation of charmless three-body baryonic decay of a vector charmonium state above the open-charm threshold. No significant signals for other charmonium(-like) states i.e., $ψ(4040)$, $ψ(4160)$, $Y(4230)$, $Y(4360)$, $ψ(4415)$, $Y(4500)$, $Y(4660)$ or $Y(4710)$ are observed, and the upper limits for the product of the branching fraction and the electronic partial width at the 90% confidence level for each assumed charmonium(-like) state are provided. Additionally, the ratios of Born cross sections between this work and the previous measurements of $e^+e^- \\to K^{0}_{S}\\barΞ^{-}Σ^-$ and $K^-\\barΞ^+\\barΣ^0$ are provided, which can be used to validate theoretical predictions related to isospin symmetry.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. D 114, L071503 (2026)",
  "arxiv": "2605.19780",
  "author_total": 775,
  "authors": [
    {
      "name": "BESIII Collaboration"
    },
    {
      "name": "M. Ablikim"
    },
    {
      "name": "M. N. Achasov"
    },
    {
      "name": "P. Adlarson"
    },
    {
      "name": "X. C. Ai"
    },
    {
      "name": "C. S. Akondi"
    },
    {
      "name": "R. Aliberti"
    },
    {
      "name": "A. Amoroso"
    },
    {
      "name": "Q. An"
    },
    {
      "name": "Y. H. An"
    },
    {
      "name": "Y. Bai"
    },
    {
      "name": "O. Bakina"
    },
    {
      "name": "H. R. Bao"
    },
    {
      "name": "X. L. Bao"
    },
    {
      "name": "M. Barbagiovanni"
    },
    {
      "name": "V. Batozskaya"
    },
    {
      "name": "K. Begzsuren"
    },
    {
      "name": "N. Berger"
    },
    {
      "name": "M. Berlowski"
    },
    {
      "name": "M. B. Bertani"
    },
    {
      "name": "D. Bettoni"
    },
    {
      "name": "F. Bianchi"
    },
    {
      "name": "E. Bianco"
    },
    {
      "name": "A. Bortone"
    },
    {
      "name": "I. Boyko"
    },
    {
      "name": "R. A. Briere"
    },
    {
      "name": "A. Brueggemann"
    },
    {
      "name": "D. Cabiati"
    },
    {
      "name": "H. Cai"
    },
    {
      "name": "M. H. Cai"
    },
    {
      "name": "X. Cai"
    },
    {
      "name": "A. Calcaterra"
    },
    {
      "name": "G. F. Cao"
    },
    {
      "name": "N. Cao"
    },
    {
      "name": "S. A. Cetin"
    },
    {
      "name": "X. Y. Chai"
    },
    {
      "name": "J. F. Chang"
    },
    {
      "name": "T. T. Chang"
    },
    {
      "name": "G. R. Che"
    },
    {
      "name": "Y. Z. Che"
    },
    {
      "name": "C. H. Chen"
    },
    {
      "name": "Chao Chen"
    },
    {
      "name": "G. Chen"
    },
    {
      "name": "H. S. Chen"
    },
    {
      "name": "H. Y. Chen"
    },
    {
      "name": "M. L. Chen"
    },
    {
      "name": "S. J. Chen"
    },
    {
      "name": "S. M. Chen"
    },
    {
      "name": "T. Chen"
    },
    {
      "name": "W. Chen"
    },
    {
      "name": "X. R. Chen"
    },
    {
      "name": "X. T. Chen"
    },
    {
      "name": "X. Y. Chen"
    },
    {
      "name": "Y. B. Chen"
    },
    {
      "name": "Y. Q. Chen"
    },
    {
      "name": "Z. K. Chen"
    },
    {
      "name": "J. Cheng"
    },
    {
      "name": "L. N. Cheng"
    },
    {
      "name": "S. K. Choi"
    },
    {
      "name": "X. Chu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/606jkv52dcy5b.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.19780",
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  "landing_url": "https://arxiv.org/abs/2605.19780",
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  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ],
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      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
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  "openalex": "W7161769957",
  "pdf_url": "https://arxiv.org/pdf/2605.19780",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/606jkv52dcy5b.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:22Z",
      "native_id": "2605.19780",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.19780"
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Measurement of Born Cross Sections for $e^+e^- \\to K^+Ξ^0\\barΣ^-$ at $\\sqrt{s} = 3.51-4.95$ GeV and Observation of $ψ(3770) \\to K^+Ξ^0\\barΣ^-$",
  "title_text": "Measurement of Born Cross Sections for e^+e^- → K^+Ξ^0Σ̅^- at √s = 3.51−4.95 GeV and Observation of ψ(3770) → K^+Ξ^0Σ̅^-",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/606jkv52dcy5b",
  "venue": "arXiv",
  "versions": [
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      "doi": "10.1103/4fgk-jg61",
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}