{
  "abstract": "The proximity of the narrow $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ structures to the $Σ_c\\bar D^{(*)}$ thresholds motivates their interpretation as hadronic molecules. We treat the $P_c(4312)$ as an $S$-wave $Σ_c\\bar D$ state with $J^P=1/2^-$ and examine both $J^P=1/2^-$ and $3/2^-$ $Σ_c\\bar D^*$ assignments for each heavier peak. The selected $S$-wave open-charm transitions to $Λ_c\\bar D^{(*)}$ are calculated at Born order in the quark-interchange model, including the prior and post rearrangement diagrams and their color, flavor, spin, and spatial matrix elements. Across the input variations considered, the quark-interchange widths robustly favor $Λ_c\\bar D^*$ over $Λ_c\\bar D$ for every $J^P=1/2^-$ assignment. At either heavier peak mass, the $Λ_c\\bar D^*$ width for $J^P=3/2^-$ is suppressed by approximately one order of magnitude relative to $J^P=1/2^-$, providing a potential decay-based discriminator of the spin assignments. The large channel hierarchies arise from spatial overlaps and interference between spin-independent and hyperfine contributions and are not universal heavy-quark-spin-symmetry ratios. We also explore a retarded one-pion-exchange transition at first Born order. It affects $P_c(4312)\\toΛ_c\\bar D^*$ most strongly, while the coherent widths remain sensitive to the cutoff, energy-transfer prescription, short-distance subtraction, and unresolved relative matching sign. The quark-interchange hierarchies are therefore the central predictions, whereas the pion-exchange results quantify matching sensitivity. Measurements of the $Λ_c\\bar D^*$ modes can directly test these patterns.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.11568",
  "author_total": 2,
  "authors": [
    {
      "name": "Vandan Patel"
    },
    {
      "name": "Ajay Kumar Rai"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dg7dbtghp0vcb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.11568",
  "fulltext_url": null,
  "id": "dg7dbtghp0vcb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.11568",
  "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/2610.11568",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dg7dbtghp0vcb.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2610.11568",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.11568"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Selected open-charm decays of the narrow \\(P_c\\) states: Quark-interchange predictions and pion-exchange sensitivity",
  "title_text": "Selected open-charm decays of the narrow P_c states: Quark-interchange predictions and pion-exchange sensitivity",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/dg7dbtghp0vcb",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/6ldz-y3vh",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}