{
  "abstract": "We analyze the $B^0 \\to K_S^0 Λ_c^+ \\barΛ_c^-$ decay recently observed by the LHCb Collaboration. The $Λ_c^+\\barΛ_c^-$ invariant-mass spectrum exhibits an accumulation near 4.63~GeV, which we investigate together with the accompanying $Λ_c^+ K_S^0$ spectrum constrained by the known $Ξ_c(2923)$ and $Ξ_c(2939)$ states. Our amplitude model includes a nonresonant term, the two established $Ξ_c$ contributions, and high-lying charmonium states in the $Λ_c^+\\barΛ_c^-$ channel. Guided by screened Godfrey--Isgur and quark-pair-creation calculations, we test the 4.63~GeV enhancement with a fixed $η_c(6S)$ amplitude at $(4629.00, 24.20)$~MeV, {which improves the description of the 4.63~GeV region}, and examine a fixed $η_c(7S)$ contribution at $(4718.84, 22.84)$~MeV, which improves the higher-mass region of the spectrum. We also evaluate the $η_c(nS) \\to Λ_c^+ \\barΛ_c^-$ baryonic decays via a hadron-loop mechanism and estimate the $B^0 \\to K_S^0 η_c(nS)$ production in naive factorization. Within the narrow width approximation, the fit yields a $\\mathcal B(B^0\\to K_S^0η_c(6S)) \\mathcal B(η_c(6S)\\toΛ_c^+\\barΛ_c^-)$ of about $6.2 \\times 10^{-6}$, while the factorization and hadron-loop calculations give rates roughly one to three orders of magnitude lower than the above fitted ratio. These results highlight the need for more precise data and a full amplitude analysis to determine the line shapes and clarify the nature of the higher-mass contribution.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. D 114, 074050 (2026)",
  "arxiv": "2608.15524",
  "author_total": 3,
  "authors": [
    {
      "name": "Cheng-Xi Liu"
    },
    {
      "name": "Jun-Zhang Wang"
    },
    {
      "name": "Xiang Liu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dyg1593p7tww5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.15524",
  "fulltext_url": null,
  "id": "dyg1593p7tww5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.15524",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2608.15524",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dyg1593p7tww5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2608.15524",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.15524"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Exploring charmonia $η_c(6S,7S)$ in the $Λ_c^+\\barΛ_c^-$ invariant mass spectrum of $B^0 \\to K_S^0Λ_c^+\\barΛ_c^-$",
  "title_text": "Exploring charmonia η_c(6S,7S) in the Λ_c^+Λ̅_c^- invariant mass spectrum of B^0 → K_S^0Λ_c^+Λ̅_c^-",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/dyg1593p7tww5",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/5lcd-6ml6",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}