{
  "abstract": "The finite width of broad scalar resonances should be taken into account when relating semileptonic $B$-meson transitions to experimentally reconstructable multihadron final states. The quasi-four-body semileptonic decays $\\bar B^0\\to a_0(1450)^+ (\\toπη)\\ell^-\\barν_\\ell$ with $\\ell=(e,μ,τ)$ provide a platform for investigating the scalar $a_0(1450)^+$-resonance as the lowest-Fock-state quark-antiquark component. We calculate the first five odd $ξ$-moments of $a_0(1450)$-resonance twist-2 light-cone distribution amplitude (LCDA) using QCDSR within the background-field theory, including vacuum condensates up to dimension six. Based on these moments, two twist-2 LCDA schemes are constructed: a light-cone harmonic oscillator model (S1), whose free parameters are fitted to the first five odd moments, and a truncated Gegenbauer expansion (S2) retaining only $a_{1,3}(μ)$. The $\\bar{B}^0 \\to a_0(1450)^+$ transition form factors are then calculated using light-cone sum rules. At large recoil region, we present the TFFs with different scheme. The finite-width effect of $a_0(1450)$-resonance is further incorporated through a two-channel Flatté parametrization including the $πη$ and $K\\bar{K}$ channels. The $πη$ invariant-mass distribution exhibits a pronounced resonance peak around $s\\simeq m_{a_0(1450)}^2$. The spectra of the electron and muon channels are nearly identical, while the $τ$-channel is significantly suppressed because the larger lepton mass reduces the available phase space. After integration over the full quasi-four-body phase space, the branching fractions are given. We expect that these results will provide useful guidance for future experimental and theoretical studies of $\\bar B^0\\to a_0(1450)^+ (\\toπη)\\ell^-\\barν_\\ell$ decay and help improve our understanding of the internal structure of $a_0(1450)$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.14980",
  "author_total": 5,
  "authors": [
    {
      "name": "Ya-Lin Song"
    },
    {
      "name": "Yin-Long Yang"
    },
    {
      "name": "Yan-Ting Yang"
    },
    {
      "name": "Dong Huang"
    },
    {
      "name": "Hai-Bing Fu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0ra3m4adh2qfk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.14980",
  "fulltext_url": null,
  "id": "0ra3m4adh2qfk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.14980",
  "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": "W7164894477",
  "pdf_url": "https://arxiv.org/pdf/2606.14980",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0ra3m4adh2qfk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2606.14980",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.14980"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Quasi-four-body semileptonic decay $\\bar B^0\\to a_0(1450)^+ (\\toπ^+ η)\\ell^-\\barν_\\ell$ within $a_0(1450)$-resonance leading-twist LCDA under QCDSR",
  "title_text": "Quasi-four-body semileptonic decay B̅^0→ a_0(1450)^+ (→π^+ η)ℓ^-ν̅_ℓ within a_0(1450)-resonance leading-twist LCDA under QCDSR",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/0ra3m4adh2qfk",
  "venue": "arXiv",
  "versions": []
}