{
  "id": "hep-ph/0208216",
  "version": "v3",
  "published": "2002-08-23T19:53:53.000Z",
  "updated": "2002-08-30T11:18:26.000Z",
  "title": "CP-Violation in the decay B^0, (B^0)bar -> pi^+ pi^- gamma",
  "authors": [
    "L. M. Sehgal",
    "J. van Leusen"
  ],
  "comment": "11 pages, 4 figures, 1 table In abstract and in Eq. (17), a + b/x corrected to a/x + b. Slight improvement in Figs. 1b, 2c and 2d",
  "journal": "Phys.Lett. B547 (2002) 1-6",
  "doi": "10.1016/S0370-2693(02)02708-9",
  "categories": [
    "hep-ph"
  ],
  "abstract": "The decay (B^0)bar -> pi^+ pi^- gamma has a bremsstrahlung component determined by the amplitude for (B^0)bar -> pi^+ pi^-, as well as a direct component determined by the penguin interaction V_tb V^*_td c_7 O_7. Interference of these amplitudes produces a photon energy spectrum d Gamma/d x = a/x + b + c_1 x + c_2 x^2 + ... (x = 2 E_gamma/m_B) where the terms c_1,2 contain a dependence on the phase alpha_eff = pi - arg[(V_tb V^*_td)^* Amp((B^0)bar -> pi^+ pi^-)]. We also examine the angular distribution of these decays, and show that in the presence of strong phases, an untagged B^0/(B^0)bar beam can exhibit an asymmetry between the pi^+ and pi^- energy spectra.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2002-08-30T11:18:26.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cp-violation",
      "photon energy spectrum",
      "angular distribution",
      "penguin interaction",
      "strong phases"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 593495
    }
  }
}