{
  "abstract": "The heavy-quark limit of light-front holographic wave functions for heavy--light mesons is investigated, with particular emphasis on the leading-twist $B$-meson light-cone distribution amplitude, $ϕ_B^+(ω)$. Two prescriptions for incorporating finite quark masses are compared: the invariant mass ansatz (IMA) and the longitudinal confining framework based on the Li--Maris--Zhao--Vary (LMZV) potential. In the IMA, although the peak of the distribution amplitude remains at a soft spectator momentum, its characteristic width decreases as $Δω\\propto m_B^{-1/2}$ in the heavy-quark limit, causing the longitudinal distribution to collapse asymptotically to $δ(ω-m_q)$. Accordingly, the inverse moment approaches the finite limit $λ_{B,\\mathrm{IMA}} \\to m_q = \\mathcal{O}(Λ_{\\mathrm{QCD}})$. In contrast, the LMZV framework approaches a finite leading-power (LP) profile with a stable width of order $\\mathcal{O}(Λ_{\\rm QCD})$ and a stable inverse moment, $λ_{B,\\mathrm{LMZV}}^{\\mathrm{LP}} = m_q + σ/2 = \\mathcal{O}(Λ_{\\mathrm{QCD}})$, which is independent of the heavy-quark mass. The heavy-quark scaling of $f_B$ is also examined using the local axial-vector current at zero transverse separation. While the LMZV longitudinal wave function has a non-singular heavy-quark limit, the bare light-front current does not reproduce the canonical heavy-quark effective theory scaling $f_B \\propto m_B^{-1/2}$: the decay constant scales as $f_B \\propto m_B^{-1}$ in the LMZV framework and as $f_B \\propto m_B^{-5/4}$ in the IMA. Thus, a non-singular heavy-quark limit of the longitudinal wave function is necessary but insufficient to ensure the correct heavy-quark scaling of local current matrix elements without systematic current matching.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.01641",
  "author_total": 1,
  "authors": [
    {
      "name": "Reza Khosravi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3jda5153ktff9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.01641",
  "fulltext_url": null,
  "id": "3jda5153ktff9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.01641",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.01641",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3jda5153ktff9.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.01641",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.01641"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Heavy-quark limit of $B$-meson distribution amplitudes in light-front holography with longitudinal confinement",
  "title_text": "Heavy-quark limit of B-meson distribution amplitudes in light-front holography with longitudinal confinement",
  "type": "preprint",
  "updated_at": "2026-11-04T15:20:58Z",
  "url": "https://research.draconitic.com/paper/3jda5153ktff9",
  "venue": "arXiv",
  "versions": []
}