{
  "abstract": "We investigate the exclusive semileptonic and nonleptonic $Λ_{b} \\to Λ_{c}(p)$ decays within the Standard Model by using the light-front quark model. To determine the behavior of the $Λ_{b} \\to Λ_{c}(p)$ transition form factors, we employ the Bethe-Salpeter formalism in the timelike region, effectively accounting for both valence and nonvalence contributions. Using these form factors, including nonvalence contributions, we obtain branching fractions of $Λ_b \\to Λ_c\\,\\ell\\,\\barν_{\\ell}$, $Λ_b \\to Λ_c\\,τ\\,\\barν_τ$, $Λ_b \\to p\\,\\ell\\,\\barν_{\\ell}$ and $Λ_b \\to p\\,τ\\,\\barν_τ$~($\\ell=e$ or $μ$) are found to be around $5.39\\%$, $1.41\\%$, $3.33\\times 10^{-4}$ and $2.08\\times 10^{-4}$, respectively, which are consistent with the experimental measurements. The ratios of $R^{\\ellτ}(Λ_{c})=\\frac{{\\cal B}({Λ_b}\\to {Λ_c}\\,τ\\,\\barν_τ)} {{\\cal B}({Λ_b}\\to {Λ_c}\\,\\ell\\,\\barν_l)}$ and $R^{\\ellτ}(p)=\\frac{{\\cal B}({Λ_b}\\to p\\,τ\\,\\barν_τ)} {{\\cal B}({Λ_b}\\to p\\,\\ell\\,\\barν_l)}$, are given by $0.261^{+0.097}_{-0.117}$ and $0.624^{+0.119}_{-0.129}$, respectively. The forward-backward asymmetries in the above semilepton decays are also examined. Our results indicate that, within the light-front framework, the nonvalence contributions to the asymmetries are negligible compared to the $β$-induced uncertainties. In addition, we calculate the branching ratios for the nonleptonic decays of $Λ_{b}\\to Λ_{c}(p)\\,M$ with $M$ being the pseudo scalar and vector mesons with the results found to be consistent with the current experimental data.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.16770",
  "author_total": 3,
  "authors": [
    {
      "name": "Chong-Chung Lih"
    },
    {
      "name": "Cong-Yu Li"
    },
    {
      "name": "Chao-Qiang Geng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2k82x1b5pg1fa.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.16770",
  "fulltext_url": null,
  "id": "2k82x1b5pg1fa",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.16770",
  "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|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7213420292",
  "pdf_url": "https://arxiv.org/pdf/2609.16770",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2k82x1b5pg1fa.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2609.16770",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.16770"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Weak Decays of the $Λ_{b}$ Baryon in Light-Front Dynamics",
  "title_text": "Weak Decays of the Λ_b Baryon in Light-Front Dynamics",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/2k82x1b5pg1fa",
  "venue": "arXiv",
  "versions": []
}