{
  "abstract": "Motivated by the deviations between experimental data and SM predictions for the branching fractions of $\\bar{B}_{(s)}^{0} \\to D_{(s)}^{(*)+}L^-$ decays with $L=π,K^{(*)},ρ$, we investigate whether the type-IV scalar diquark can offer a plausible explanation for them. By matching the renormalized amplitudes in the full theory onto those in the low-energy effective theory formulated in the diquark operator basis, we extract the corresponding Wilson coefficients up to NLO in $α_s$ at the NP scale $μ_ϕ=M_ϕ$. We then rewrite the obtained operators in the SM basis and apply the renormalization-group running to evolve the Wilson coefficients down to the hadronic scale $μ_b=m_b$. For the hadronic matrix elements of the relevant NP operators, we employ the QCD factorization approach to evaluate the non-factorizable one-loop vertex corrections, and confront our theoretical predictions to the latest data to constrain the diquark parameter space. In the single-coupling case, we find that the purely left-handed coupling $Δ_{d(s)}^{LL}$ can reconcile the discrepancies at $1σ$, while the mixed right-left coupling $Δ_{d(s)}^{RL}$ remains compatible with data only at about $2σ$. Extending to the two-coupling case, we find viable parameter regions as long as $Δ_{d(s)}^{LL}\\neq 0$. Incorporating the LHCb measurement of the ratio $R_{π/μν_μ}$ further reduces the allowed range of $Δ_{d}^{LL}$, but does not yield meaningful extra restriction on $Δ_{d}^{RL}$. Hence, while either $Δ_{d(s)}^{LL}$ or $Δ_{d(s)}^{RL}$ can separately provide an acceptable NP interpretation, our phenomenological results favor a scenario dominated by purely left-handed diquark-quark couplings. Finally, we present updated predictions for the branching fractions and the ratios $R_{(s)L}^{(*)}$, which can be probed by forthcoming LHCb and Belle II measurements.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.05958",
  "author_total": 5,
  "authors": [
    {
      "name": "Fang-Min Cai"
    },
    {
      "name": "Xin-Qiang Li"
    },
    {
      "name": "Tong-Kai Liu"
    },
    {
      "name": "Yan Shi"
    },
    {
      "name": "Ya-Dong Yang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5918y8e6z9n1x.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.05958",
  "fulltext_url": null,
  "id": "5918y8e6z9n1x",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.05958",
  "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",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7220664072",
  "pdf_url": "https://arxiv.org/pdf/2610.05958",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5918y8e6z9n1x.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2610.05958",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.05958"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Phenomenological study of diquark effects in $\\bar{B}_{(s)}^0 \\to D_{(s)}^{(*)+} L^-$ decays",
  "title_text": "Phenomenological study of diquark effects in B̅_(s)^0 → D_(s)^(*)+ L^- decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/5918y8e6z9n1x",
  "venue": "arXiv",
  "versions": []
}