{
  "abstract": "A bstract : We investigate the decays $$ {B}_c^{-}\\to {D}_s^{\\left(\\ast \\right)-}{\\ell}^{+}{\\ell}^{-} $$ B c − → D s ∗ − ℓ + ℓ − and $$ {B}_c^{-}\\to {D}_s^{\\left(\\ast \\right)-}\\nu \\overline{\\nu} $$ B c − → D s ∗ − ν ν ¯ within the Standard Model (SM), employing perturbative QCD (pQCD) form factors that are sensitive to the wave functions of B c and $$ {D}_s^{\\left(\\ast \\right)} $$ D s ∗ mesons. We determine the shape parameters of these mesons and the $$ {B}_c\\to {D}_s^{\\left(\\ast \\right)} $$ B c → D s ∗ form factors at q ² = 0 from available lattice QCD inputs for $$ {B}_s\\to {D}_s^{\\left(\\ast \\right)} $$ B s → D s ∗ and B c → D s transitions. To obtain the q ² dependence of the $$ {B}_c\\to {D}_s^{\\ast } $$ B c → D s ∗ form factors, we employ heavy-quark spin symmetry (HQSS) and an appropriate parametrization scheme over the allowed q ² region. Based on these inputs, we present predictions for branching ratios and lepton-flavour-sensitive observables. Furthermore, we perform a detailed angular analysis of the cascade decay $$ {B}_c^{-}\\to {D}_s^{\\ast -}\\left(\\to {D}_s^{-}{\\pi}^0\\right){\\ell}^{+}{\\ell}^{-} $$ B c − → D s ∗ − → D s − π 0 ℓ + ℓ − , providing Standard Model predictions for several angular observables.",
  "abstract_shown": true,
  "affiliations": [
    "Indian Institute of Technology Guwahati"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Utsab Dey",
      "orcid": "0000-0002-6228-741X"
    },
    {
      "affs": [
        0
      ],
      "name": "Soumitra Nandi",
      "orcid": "0000-0001-6567-0302"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8ecssgchsjx86.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)016",
  "fulltext_url": null,
  "id": "8ecssgchsjx86",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/10.1007/JHEP10(2026)016",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7127434486",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)016.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/8ecssgchsjx86.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)016",
      "source": "crossref",
      "url": "https://link.springer.com/10.1007/JHEP10(2026)016"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Particle physics theoretical and experimental studies",
      "subfield": "high-energy"
    }
  ],
  "title": "Study of form factors and observables in $$ {B}_c^{-}\\to {D}_s^{\\ast -}{\\ell}^{+}{\\ell}^{-} $$ and $$ {B}_c^{-}\\to {D}_s^{\\ast -}\\nu \\overline{\\nu} $$ decays",
  "title_text": "Study of form factors and observables in B_c^−→ D_s^∗ −ℓ^+ℓ^− and B_c^−→ D_s^∗ −ν ν̅ decays",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/8ecssgchsjx86",
  "venue": "Journal of High Energy Physics",
  "versions": []
}