{
  "id": "hep-ex/0508033",
  "version": "v1",
  "published": "2005-08-15T02:20:47.000Z",
  "updated": "2005-08-15T02:20:47.000Z",
  "title": "Angles of the CKM Unitarity Triangle Measured at Belle",
  "authors": [
    "A. J. Schwartz"
  ],
  "comment": "14 pages, 6 figures, 2 tables, recent results from the Belle experiment. Contribution to the 19th Les Rencontres de Physique de la Vallee d'Aoste",
  "categories": [
    "hep-ex"
  ],
  "abstract": "The Belle experiment has used several methods to measure or constrain the angles phi_1, phi_2, and phi_3 (or beta, alpha, and gamma) of the CKM unitarity triangle. The results are sin(2phi_1) = 0.728 \\pm 0.056 (stat) \\pm 0.023 (syst) or phi_1= (23.4 +2.7 -2.4) degrees from B0 -> J/psi K0 decays (140 fb-1); phi_2 = 0-19 degrees or 71-180 degrees at 95.4% CL from B0 -> pi+pi- decays (253 fb-1); and phi_3 = [68 +14 -15 (stat) \\pm 13 (syst) \\pm 11 (model)] degrees from B+ -> (D0, D0bar) K+, (D0,D0bar) -> K0_S pi+ pi- decays (253 fb-1). These values satisfy the triangle relation phi_1 + phi_2 + phi_3 = 180 degrees within their uncertainties. The angle phi_1 is also determined from several b -> s qbar q penguin-dominated decay modes; the value obtained by taking a weighted average of the individual results differs from the B0 -> J/psi K0 result by more than two standard deviations. The angle phi_2 is constrained by measuring a CP asymmetry in the decay time distribution; the asymmetry observed is large, and the difference in the yields of B0,B0bar -> pi+ pi- decays constitutes the first evidence for direct CP violation in the B system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2005-08-15T02:20:47.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ckm unitarity triangle",
      "direct cp violation",
      "j/psi k0 decays",
      "decay time distribution",
      "j/psi k0 result"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 689882,
      "adsabs": "2005hep.ex....8033S"
    }
  }
}