{
  "id": "1312.1193",
  "version": "v2",
  "published": "2013-12-04T14:58:49.000Z",
  "updated": "2014-04-15T08:28:56.000Z",
  "title": "B_l4 decays and the extraction of |V_ub|",
  "authors": [
    "Xian-Wei Kang",
    "Bastian Kubis",
    "Christoph Hanhart",
    "Ulf-G. Meißner"
  ],
  "comment": "12 pages, 4 figures; v2: Appendix C removed, version published in Phys. Rev. D",
  "journal": "Phys. Rev. D 89, 053015 (2014)",
  "doi": "10.1103/PhysRevD.89.053015",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "The Cabibbo-Kobayashi-Maskawa matrix element |V_ub| is not well determined yet. It can be extracted from both inclusive or exclusive decays, like B --> pi (rho) l nu-bar_l. However, the exclusive determination from B --> rho l nu-bar_l, in particular, suffers from a large model dependence. In this paper, we propose to extract |V_ub| from the four-body semileptonic decay B --> pi pi l nu-bar_l, where the form factors for the pion-pion system are treated in dispersion theory. This is a model-independent approach that takes into account the pi-pi rescattering effects, as well as the effect of the rho meson. We demonstrate that both finite-width effects of the rho meson as well as scalar pi-pi contributions can be considered completely in this way.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-04-15T08:28:56.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.75.Lb",
      "11.55.Fv",
      "13.20.He",
      "12.15.Hh"
    ],
    "keywords": [
      "extraction",
      "rho meson",
      "cabibbo-kobayashi-maskawa matrix element",
      "large model dependence",
      "four-body semileptonic decay"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2014,
      "month": "Mar",
      "volume": 89,
      "number": 5,
      "pages": "053015"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1267509,
      "adsabs": "2014PhRvD..89e3015K"
    }
  }
}