{
  "id": "hep-ph/0510104",
  "version": "v3",
  "published": "2005-10-10T18:04:16.000Z",
  "updated": "2006-01-08T05:16:09.000Z",
  "title": "The CP asymmetry in B^0(t) -> K_S π^0 γin the Standard Model",
  "authors": [
    "Benjamin Grinstein",
    "Dan Pirjol"
  ],
  "comment": "11 pages, 4 figures. Final version to appear in Physical Review D",
  "journal": "Phys.Rev. D73 (2006) 014013",
  "doi": "10.1103/PhysRevD.73.014013",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "The time-dependent CP asymmetry in exclusive B^0(t) -> K^{*0}\\gamma decays has been proposed as a probe of new physics in B decays. Recently, this method was extended to radiative decays into multibody hadronic final states such as B^0(t)-> K_S\\pi^0\\gamma and B^0(t)-> \\pi^+\\pi^-\\gamma. The CP asymmetry in these decays vanishes to the extent that the photon is completely polarized. In the Standard Model, the photon emitted in b-> s\\gamma has high left-handed polarization, but right-handed contamination enters already at leading order in \\Lambda/m_b even for vanishing light quark masses. We compute here the magnitude of this effect and the time dependent CP asymmetry parameter S_{K_S \\pi^0\\gamma}. We find that the Standard Model can easily accomodate values of S as large as 10%, but a precise value cannot be obtained at present because of strong interactions uncertainties.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2006-01-08T05:16:09.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.60.-r",
      "12.39.Fe"
    ],
    "keywords": [
      "standard model",
      "time dependent cp asymmetry parameter",
      "multibody hadronic final states",
      "time-dependent cp asymmetry",
      "vanishing light quark masses"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 694646
    }
  }
}