{
  "abstract": "Using continuum Schwinger function methods, we deliver parameter-free pointwise predictions for the complete set of twelve Standard Model (SM) $\\bar B_{(s)} \\to D_{(s)}^{(\\ast)}$, i.e., $b\\to c$, semileptonic transition form factors on the entire kinematically accessible domain. Therewith, we calculate SM theory values for the decay-rate ratios of $τ$ and $μ$ final states: $\\{ R(D) \\, , \\, R(D)^\\ast \\} = \\{ 0.290(11) \\, , \\, 0.267(5) \\}$, $\\{ R(D_{s}) \\, , \\, R(D_{s}^{\\ast}) \\} = \\{ 0.283(11) \\, , \\, 0.251(5) \\}$. The former is consistent with an existing average of SM estimates, but disagrees with the experimental average by $2.8σ$. Comparing transitions with light quark and strange quark spectators, we find a $2.3σ$ signal for violation of SU$(3)$ flavour symmetry, expressed at the 5% level in $D_{(s)}^\\ast$ final states. It is induced by Higgs boson couplings into the strong interaction and modulated by phenomena deriving from emergent features of the strong interaction.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.17289",
  "author_total": 4,
  "authors": [
    {
      "name": "Yu-Chen Hu"
    },
    {
      "name": "Cong-Cong Ye"
    },
    {
      "name": "Craig D. Roberts"
    },
    {
      "name": "Zhao-Qian Yao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d15kn1fkmhbww.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.17289",
  "fulltext_url": null,
  "id": "d15kn1fkmhbww",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.17289",
  "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-ex"
    ],
    [
      "arxiv",
      "hep-lat"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7221769419",
  "pdf_url": "https://arxiv.org/pdf/2610.17289",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/d15kn1fkmhbww.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.17289",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.17289"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Lepton Flavour Universality in Semileptonic $\\bar B_{(s)} \\to D_{(s)}^{(\\ast)}$ Transitions",
  "title_text": "Lepton Flavour Universality in Semileptonic B̅_(s) → D_(s)^(∗) Transitions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/d15kn1fkmhbww",
  "venue": "arXiv",
  "versions": []
}