{
  "id": "hep-ex/0507039",
  "version": "v1",
  "published": "2005-07-09T03:51:48.000Z",
  "updated": "2005-07-09T03:51:48.000Z",
  "title": "Measurement of the branching fraction, polarization, and CP asymmetry in B0 -> rho+rho- decays",
  "authors": [
    "K. Abe",
    "for the Belle Collaboration"
  ],
  "comment": "14 pages, 5 figures, submitted to the Lepton-Photon 2005 Conference (Uppsala, Sweden) and the HEP2005 Europhysics Conference (Lisboa, Portugal)",
  "categories": [
    "hep-ex"
  ],
  "abstract": "We have measured the branching fraction, longitudinal polarization fraction f_L, and the CP asymmetry coefficients A and S in B0 -> rho+rho- decays. These results are obtained from a 253 fb-1 data sample containing 275 million B\\bar{B} pairs collected by the Belle detector running at the KEKB e+e- collider. We obtain B = [24.4 \\pm 2.2 (stat) +3.8 -4.1 (syst)] x 10-6, f_L = 0.951 +0.033 -0.039 (stat) +0.029 -0.031 (syst), A = 0.00 \\pm 0.30 (stat) +0.10 -0.09 (syst), and S = 0.09 \\pm 0.42 (stat) \\pm 0.08 (syst). These values are used to determine the CKM phase angle phi_2 (alpha) via an isospin analysis; the central value and one sigma error are (87 \\pm 17) degrees, and 59 degrees < phi_2 < 115 degrees at 90% CL.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2005-07-09T03:51:48.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "12.15.Hh",
      "11.30.Er",
      "13.25.Hw"
    ],
    "keywords": [
      "branching fraction",
      "measurement",
      "longitudinal polarization fraction",
      "cp asymmetry coefficients",
      "ckm phase angle"
    ],
    "tags": [
      "conference paper"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 687092,
      "adsabs": "2005hep.ex....7039A"
    }
  }
}