{
  "abstract": "Motivated by the recent BESIII measurement, we revisit the $Λ_c^+\\to nπ^+η$ decay within the chiral unitary approach, including internal and external $W$-emission mechanisms and final-state interactions. The $a_0(980)^+$ and $N(1535)^{0,+}$ resonances are dynamically generated by meson--meson and meson--baryon interactions, respectively. With the relative weight of internal to external emission fixed at $1/3$, $2/3$, and $1$, all three scenarios reasonably describe the measured $π^+η$ invariant mass distribution, but yield different fractions for the $a_0(980)$ contribution, and the fraction obtained for $γ=2/3$ and $1$ are numerically below the experimental upper limit. The $a_0(980)$ contribution exhibits a threshold cusp, modified by coherent interference in the total spectrum. Its modest prominence, together with the limited statistical precision and coarse binning, offers a plausible explanation for the absence of a clear experimental signal. We also predict the $ηn$ and $π^+n$ invariant mass distributions. Future high-statistics measurements at BESIII, Belle~II, and STCF would enable a joint analysis to constrain the relative production weight and resonance contributions, providing further insight into the nature of the $a_0(980)$ and $N(1535)$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.05629",
  "author_total": 5,
  "authors": [
    {
      "name": "Meng-Yuan Li"
    },
    {
      "name": "Jing Tang"
    },
    {
      "name": "Wen-Tao Lyu"
    },
    {
      "name": "Shi-Chen Xue"
    },
    {
      "name": "En Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5t86v7v6qsw4e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.05629",
  "fulltext_url": null,
  "id": "5t86v7v6qsw4e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.05629",
  "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",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7201880263",
  "pdf_url": "https://arxiv.org/pdf/2608.05629",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5t86v7v6qsw4e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2608.05629",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.05629"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Revisiting the $Λ_c^+ \\to nπ^+η$ decay in light of the BESIII measurement",
  "title_text": "Revisiting the Λ_c^+ → nπ^+η decay in light of the BESIII measurement",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/5t86v7v6qsw4e",
  "venue": "arXiv",
  "versions": []
}