{
  "abstract": "We present a holographic analysis of the semileptonic decays $B \\to D \\ell \\barν_\\ell$ and $B_s \\to D_s \\ell \\barν_\\ell$ within the Softwall Model (SWM) and the Non-Quadratic Softwall Model (NQSWM). We extract the Isgur-Wise function from the overlap integral of bulk wavefunctions, with model parameters fixed by the heavy-light meson spectra. We impose Heavy Quark Symmetry (HQS) at zero recoil and address the apparent paradox of a non-conserved electroweak current dual to a massless bulk vector field. We argue that the non-conservation, arising from explicit flavor-- symmetry breaking by quark masses, does not generate an anomalous dimension. Hence the bulk field remains massless, and the non-conservation is \\emph{encoded} in the independent boundary couplings $g_+$ and $g_-$. Our predictions for the branching fractions are in good agreement with LHCb data for $B_s \\to D_s$ decays. The lepton-flavor universality ratios $R(D)$ and $R(D_s)$ are consistent with Standard Model and lattice QCD predictions. We find that the holographic models reproduce the universality of the Isgur-Wise function near zero recoil, while discrepancies at maximum recoil suggest that a more complete treatment of higher-order $1/m_Q$ corrections is needed.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.28287",
  "author_total": 2,
  "authors": [
    {
      "name": "Miguel Angel Martin Contreras"
    },
    {
      "name": "Alfredo Vega"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/17ks6kkw9492p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.28287",
  "fulltext_url": null,
  "id": "17ks6kkw9492p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.28287",
  "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": "W7223158819",
  "pdf_url": "https://arxiv.org/pdf/2610.28287",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/17ks6kkw9492p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.28287",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.28287"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Holographic Calculation of Semileptonic Form Factors and the Isgur--Wise Function for $B_{(s)}\\to D_{(s)}$ Decays",
  "title_text": "Holographic Calculation of Semileptonic Form Factors and the Isgur--Wise Function for B_(s)→ D_(s) Decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/17ks6kkw9492p",
  "venue": "arXiv",
  "versions": []
}