{
  "id": "2002.07272",
  "version": "v1",
  "published": "2020-02-17T21:55:53.000Z",
  "updated": "2020-02-17T21:55:53.000Z",
  "title": "Revisit to the $b\\to cτν$ transition: in and beyond the SM",
  "authors": [
    "Kingman Cheung",
    "Zhuo-Ran Huang",
    "Hua-Dong Li",
    "Cai-Dian Lü",
    "Ying-nan Mao",
    "Ru-Ying Tang"
  ],
  "comment": "28 pages, 5 figures and 12 tables",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "We perform an analysis of the $b\\to c\\tau\\nu$ data, including $R(D^{(*)})$, $R(J/\\psi)$, $P_\\tau(D^{*})$ and $F_L^{D^*}$, within and beyond the Standard Model (SM). We fit the $B\\to D^{(*)}$ hadronic form factors in the HQET parametrization to the lattice and the light-cone sum rule (LCSR) results, applying the unitarity bounds derived in the analysis. We then investigate the model-independent and the leptoquark model explanations of the $b\\to c\\tau\\nu$ anomalies. Specifically, we consider the one-operator, the two-operator new physics (NP) scenarios and the NP models with a single leptoquark which can address the $b\\to c\\tau\\nu$ anomalies. We also give predictions for various observables including $R(D^{(*)})$ in the SM and the NP scenarios/leptoquark models based on the present form factor study and the analysis of NP.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-02-17T21:55:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "transition",
      "leptoquark model explanations",
      "light-cone sum rule",
      "np scenarios/leptoquark models",
      "hadronic form factors"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 28,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}