{
  "id": "0708.1235",
  "version": "v2",
  "published": "2007-08-09T19:47:14.000Z",
  "updated": "2007-10-29T19:19:49.000Z",
  "title": "Dispersive representation and shape of K_{l3} form factors",
  "authors": [
    "Emilie Passemar"
  ],
  "comment": "7 pages, 4 figures. Discussion slightly extended in section 2. Talk given at the KAON07 International Conference, May 21-25 2007, Frascati, Italy",
  "journal": "PoSKAON:012,2008",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "The Callan-Treiman low-energy theorem offers an opportunity to test electroweak couplings of light quarks to the gauge boson W. To that aim, we introduce a model-independent and accurate dispersive parametrization of the two K_{l3} form factors. We then discuss three applications to the analysis of K_{e3} and K_{mu3} measurements: the prediction of the ratios Gamma(K_{mu3})/Gamma(K_{e3}), the extraction of |f_+(0)V_{us}| and finally the possible measurement of m_u - m_d induced isospin breaking asymmetry.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2007-10-29T19:19:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "form factors",
      "dispersive representation",
      "callan-treiman low-energy theorem offers",
      "test electroweak couplings",
      "light quarks"
    ],
    "tags": [
      "conference paper",
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 757882,
      "adsabs": "2007arXiv0708.1235P"
    }
  }
}