{
  "abstract": "We calculate the decay constants of the lowest-lying $B_c$ mesons in the spin-parity channels $J^P = 0^-,\\,0^+,\\,1^-,\\,1^+$, commonly referred to as the $B_c,\\, B_{c0}^*,\\, B_c^*,\\, B_{c1}$ mesons, respectively. Within the framework of QCD sum rules, we consider the decay constants associated with both the (axial-)vector and (axial-)tensor interpolating currents. The decay constants with (axial-)vector currents have already been studied in the literature. We refine previous QCD sum rule results by including higher-order power corrections and performing a comprehensive uncertainty analysis. Furthermore, we provide the first determination of the (axial-)tensor decay constants of the $B_c^*$ and $B_{c1}$ mesons. These new results will not only improve theoretical predictions for purely leptonic $B_c$ decays, but also strengthen unitarity constraints on $b \\to c$ form factors, thereby improving the precision of predictions for $\\bar{B} \\to D^{(*)} \\ell \\barν$ decays and the determination of $|V_{cb}|$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.25733",
  "author_total": 3,
  "authors": [
    {
      "name": "Eduard Costa i Reina"
    },
    {
      "name": "Nico Gubernari"
    },
    {
      "name": "Zachary Wüthrich"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1ht8967bmj4e4.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.25733",
  "fulltext_url": null,
  "id": "1ht8967bmj4e4",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.25733",
  "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/2606.25733",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1ht8967bmj4e4.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2606.25733",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.25733"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Decay constants of the $B_c$ mesons with vector and tensor currents",
  "title_text": "Decay constants of the B_c mesons with vector and tensor currents",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/1ht8967bmj4e4",
  "venue": "arXiv",
  "versions": []
}