{
  "id": "2410.17974",
  "version": "v1",
  "published": "2024-10-23T15:38:02.000Z",
  "updated": "2024-10-23T15:38:02.000Z",
  "title": "Semileptonic $B \\to D^*$ decays from light to $τ$ leptons: the extraction of the form factor $F_2$ from data",
  "authors": [
    "G. Martinelli",
    "S. Simula",
    "L. Vittorio"
  ],
  "comment": "25 pages, 11 figures, 5 tables",
  "categories": [
    "hep-ph",
    "hep-ex",
    "hep-lat"
  ],
  "abstract": "We extend the Standard Model (SM) analysis of Ref. [1], which was limited to light leptons in the final state, to the semileptonic $B \\to D^* \\tau \\nu_\\tau$ decay. By using quantities that can be analised without the knowledge of $\\vert V_{cb}\\vert$, we derive important information about the helicity amplitudes and the hadronic form factors that can be compared with the predictions of lattice QCD calculations. In particular, there is a difficulty in reproducing simultaneously the experimental values of $R(D^*)$ and of other quantities relevant for the semitauonic decays within the SM. As a byproduct of our analysis, we also present a determination of $\\vert V_{cb}\\vert$ from the total decay rate.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-10-23T15:38:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "semileptonic",
      "extraction",
      "hadronic form factors",
      "lattice qcd calculations",
      "total decay rate"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 25,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}