{
  "abstract": "We determine a normalized two-variable longitudinal distribution of the $Λ_b=(ud)b$ baryon from a covariant three-quark light-front wave function. The scalar $ud$ channel is selected with the good-component structure $Cγ_5γ^+$, and the two independent transverse momenta are integrated without introducing an elementary diquark. The resulting model-scale valence distribution, $Ψ_2^{\\rm LF}(x_u,x_d)$, retains both the heavy--light and internal-light momentum scales of the parent wave function. It is symmetric under $x_u\\leftrightarrow x_d$, is concentrated where both light-quark fractions are small, and separates the total light-pair momentum from its internal sharing. For the central parameter set we find $\\langle x_u\\rangle=\\langle x_d\\rangle=0.130$, $\\langle x_b\\rangle=0.739$, $\\langleζ^2\\rangle=0.153$, and $\\langleζ^4\\rangle=0.055$, where $ζ=(x_u-x_d)/(x_u+x_d)$. Parameter variations give $\\langle x_u\\rangle=0.130^{+0.007}_{-0.007}$, $\\langle x_b\\rangle=0.739^{+0.014}_{-0.014}$, $\\langleζ^2\\rangle=0.153^{+0.014}_{-0.016}$, and $\\langleζ^4\\rangle=0.055^{+0.009}_{-0.009}$. The heavy--light momentum partition is controlled mainly by $β_{b,ud}$ and $m_b$, whereas the internal $u$--$d$ sharing is most sensitive to $β_{ud}$. The result provides a compact finite-mass benchmark for three-quark longitudinal structure, with distinct observables for heavy--light momentum sharing and correlations inside the light pair.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.21148",
  "author_total": 2,
  "authors": [
    {
      "name": "Shuai Xu"
    },
    {
      "name": "Xiao-Nan Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4ds80m127cvgw.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.21148",
  "fulltext_url": null,
  "id": "4ds80m127cvgw",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.21148",
  "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/2610.21148",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4ds80m127cvgw.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.21148",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.21148"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Two-variable longitudinal distribution of the $Λ_b$ in a three-quark light-front model",
  "title_text": "Two-variable longitudinal distribution of the Λ_b in a three-quark light-front model",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:17Z",
  "url": "https://research.draconitic.com/paper/4ds80m127cvgw",
  "venue": "arXiv",
  "versions": []
}