{
  "abstract": "We investigate the mass spectra and two-body nonleptonic weak decays of ground-state doubly and triply heavy baryons in a nonrelativistic quark-diquark model. To account for the finite size of the diquark, we generalize the convoluted quark-diquark interaction to unequal-mass diquarks using mass-weighted constituent coordinates and distinct pairwise spin-spin couplings. The resulting Schr{ö}dinger equations provide the baryon masses and wave functions used consistently in the decay calculation. The predicted masses differ from existing lattice QCD results by less than $1.5\\%$, and our calculated mass of $Ω_{cc}^{+}$ is consistent with recent LHCb observations. The calculated hyperfine splittings are systematically slightly smaller than the lattice values, indicating a residual uncertainty in the spin-dependent interaction. Within the factorization approximation, we evaluate the $c\\to s$ and $b\\to c$ transitions with pion or kaon emission. At leading nonrelativistic order, the vector contribution vanishes for the $3/2^+\\to1/2^+$ transitions, while both vector and axial contributions enter the $3/2^+\\to3/2^+$ channels. The $b\\to c$ spatial overlaps are substantially smaller than their $c\\to s$ counterparts. Together with the Cabibbo-Kobayashi-Maskawa hierarchy, this reduces the corresponding $b \\to c$ width by approximately two orders of magnitude. In the $3/2^+\\to1/2^+$ charm transitions, the leading $|\\bm{k}|^3$ dependence enhances the suppression of kaon emission. In bottom transitions with a larger energy release, the smaller relative phase-space difference brings the ratios close to the scaling determined by the Cabibbo-Kobayashi-Maskawa elements and meson decay constants. These results provide benchmark estimates for future studies of multiply heavy baryons and quantify the role of recoil dynamics within the finite-size quark-diquark framework.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.05721",
  "author_total": 2,
  "authors": [
    {
      "name": "Yongtao Yu"
    },
    {
      "name": "Tao Guo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/420zbgzqysce2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.05721",
  "fulltext_url": null,
  "id": "420zbgzqysce2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.05721",
  "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-ph"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7220683132",
  "pdf_url": "https://arxiv.org/pdf/2610.05721",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/420zbgzqysce2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.05721",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.05721"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Spectra and nonleptonic decays of multiply heavy baryons in a finite-size quark-diquark model",
  "title_text": "Spectra and nonleptonic decays of multiply heavy baryons in a finite-size quark-diquark model",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/420zbgzqysce2",
  "venue": "arXiv",
  "versions": []
}