{
  "id": "hep-ph/0102013",
  "version": "v3",
  "published": "2001-02-02T10:52:04.000Z",
  "updated": "2002-07-30T06:53:27.000Z",
  "title": "Threshold resummation for exclusive B meson decays",
  "authors": [
    "Hsiang-nan Li"
  ],
  "comment": "10 pages, more details are included",
  "journal": "Phys.Rev. D66 (2002) 094010",
  "doi": "10.1103/PhysRevD.66.094010",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We argue that double logarithmic corrections $\\alpha_s\\ln^2 x$ need to be resumed in perturbative QCD factorization theorem for exclusive $B$ meson decays, when the end-point region with a momentum fraction $x\\to 0$ is important. These double logarithms, being of the collinear origin, are absorbed into a quark jet function, which is defined by a matrix element of a quark field attached by a Wilson line. The factorization of the jet function from the decay $B\\to\\gamma l\\bar\\nu$ is proved to all orders. Threshold resummation for the jet function leads to a universal, {\\it i.e.}, process-independent, Sudakov factor, whose qualitative behavior is analyzed and found to smear the end-point singularities in heavy-to-light transition form factors.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2002-07-30T06:53:27.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "12.38.Bx",
      "12.38.Cy",
      "13.25.Hw"
    ],
    "keywords": [
      "meson decays",
      "threshold resummation",
      "heavy-to-light transition form factors",
      "quark jet function",
      "perturbative qcd factorization theorem"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 552721
    }
  }
}