{
  "id": "1702.01704",
  "version": "v1",
  "published": "2017-02-06T16:55:27.000Z",
  "updated": "2017-02-06T16:55:27.000Z",
  "title": "Evaluation of CKM matrix elements from exclusive $P_{\\ell 4}$ decays",
  "authors": [
    "C. S. Kim",
    "G. López Castro",
    "S. L. Tostado"
  ],
  "comment": "13 pages, 2 tables, 5 figures",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We consider the exclusive $P_{\\ell 4}$ decays, $P\\to (P_1P_2)_V\\ell \\nu_{\\ell}$, where the subindex $V$ means that the invariant mass of the pseudoscalar pair is taken within a small window around the mass of the vector meson $V$. Pole contributions beyond the dominant $P\\to V(\\to P_1P_2)\\ell\\nu_{\\ell}$ amplitude of $P_{\\ell 4}$ decays are identified, which, in turn, affects the determination of the CKM matrix elements $|V_{qq'}|$. We evaluate the effects of those contributions in the extraction of bottom and charm quark mixings. An application to $B\\to (\\pi\\pi)_{\\rho}\\ell \\nu_{\\ell}$ data from Belle collaboration, shows an increase in the extracted value of $|V_{ub}|$ in better agreement with determinations based on $B\\to \\pi\\ell\\nu_{\\ell}$ decays. The effect of the $\\rho$ and $D^*$ pole contributions in the determination of $|V_{cd}|$ from the decay, $D\\to \\pi\\pi \\ell^- \\bar{\\nu}_{\\ell}$, has been also investigated.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-02-06T16:55:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ckm matrix elements",
      "evaluation",
      "pole contributions",
      "determination",
      "charm quark mixings"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}