{
  "abstract": "We study pseudoscalar heavy mesons in the QCD instanton vacuum beyond the static limit. Finite-mass effects in the heavy-light loop are encoded in a separable effective vertex built from a profile function $ϕ(\\vec{p})$, kept distinct from the static Wilson-line form factor $F_Q^{(\\infty)}(\\vec{q})$ of the $m_Q\\to\\infty$ limit. The pseudoscalar two-point function fixes the residual mass $Λ$ and the residue-normalized meson-quark coupling, from which we evaluate the decay constant and the spin-independent kinetic matrix element including the retained $1/m_Q$ derivative and kinetic contributions. The Isgur-Wise function is evaluated separately in the static heavy-quark limit, and its zero-recoil slope is extracted by using the same residue-normalized heavy-light vertex. The subleading calculation is restricted to the kinetic (derivative) part of the HQET operators. For a representative vertex, calibrated at fixed $m_b^{\\mathrm{eff}}=5.04\\,\\mathrm{GeV}$ to the leading-order decay constant $f_B^{\\mathrm{LO}}=180.0\\,\\mathrm{MeV}$ and the spin-averaged mass $\\bar{m}_B=5.313\\,\\mathrm{GeV}$, we obtain $δf_B^{(1/m_Q,\\mathrm{partial})}=+121.9\\,\\mathrm{MeV}$ and $f_B^{\\mathrm{partial}}=301.9\\,\\mathrm{MeV}$, $Λ=190.7\\,\\mathrm{MeV}$, $λ_1^{(\\partial)}=-0.773\\,\\mathrm{GeV}^2$, and $ρ_{\\mathrm{IW}}^2=1.153$. The kinetic contribution yields a mass shift of order $Λ/2$ and a sizable partial $1/m_Q$ correction, indicating that the spin-independent nonperturbative $1/m_Q$ sector is a sensitive probe of the finite-mass heavy-light vertex.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.28702",
  "author_total": 4,
  "authors": [
    {
      "name": "Ki-Hoon Hong"
    },
    {
      "name": "Yongwoo Choi"
    },
    {
      "name": "Nurmukhammad Rakhimov"
    },
    {
      "name": "Hyun-Chul Kim"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6pfd28syacrfm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.28702",
  "fulltext_url": null,
  "id": "6pfd28syacrfm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.28702",
  "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/2606.28702",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6pfd28syacrfm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2606.28702",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.28702"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Heavy mesons from the QCD instanton vacuum beyond the static limit",
  "title_text": "Heavy mesons from the QCD instanton vacuum beyond the static limit",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/6pfd28syacrfm",
  "venue": "arXiv",
  "versions": []
}