{
  "id": "hep-ph/0401206",
  "version": "v2",
  "published": "2004-01-26T16:53:19.000Z",
  "updated": "2004-03-24T12:04:44.000Z",
  "title": "On Deviations from Bimaximal Neutrino Mixing",
  "authors": [
    "P. H. Frampton",
    "S. T. Petcov",
    "W. Rodejohann"
  ],
  "comment": "26 pages, 6 figures. Typos corrected, references added, to appear in NPB",
  "journal": "Nucl.Phys. B687 (2004) 31-54",
  "doi": "10.1016/j.nuclphysb.2004.03.014",
  "categories": [
    "hep-ph"
  ],
  "abstract": "The PMNS neutrino mixing matrix U_{PMNS} is in general a product of two unitary matrices U_{lep} and U_{\\nu} arising from the diagonalization of the charged lepton and neutrino mass matrices, U_{PMNS} = U^{\\dagger}_{lep} U_{\\nu}. Assuming that U_{\\nu} is a bimaximal mixing matrix, we investigate the possible forms of U_{lep}. We identify three possible generic structures of U_{lep}, which are compatible with the existing data on neutrino mixing. One corresponds to a hierarchical ``CKM-like'' matrix. In this case relatively large values of the solar neutrino mixing angle \\theta_{sol}, and of |U_{e3}|^2, are typically predicted, \\tan^2\\theta_{sol} \\gtap 0.42, |U_{e3}|^2 \\gtap 0.02, while the atmospheric neutrino mixing angle \\theta_{atm} can deviate noticeably from \\pi/4, \\sin^2 2\\theta_{atm} \\gtap 0.95. The second corresponds to one of the mixing angles in U_{lep} being equal to \\pi/2, and predicts practically maximal atmospheric neutrino mixing \\sin^2 2\\theta_{atm} \\simeq 1. Large atmospheric neutrino mixing, \\sin^2 2\\theta_{atm} \\gtap 0.95, is naturally predicted by the third possible generic structure of U_{lep}, which corresponds to all three mixing angles in U_{lep} being large. We focus especially on the case of CP-nonconservation, analyzing it in detail. We show how the CP-violating phases, arising from the diagonalization of the neutrino and charged lepton mass matrices, contribute to the measured neutrino mixing observables.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2004-03-24T12:04:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "bimaximal neutrino mixing",
      "maximal atmospheric neutrino mixing",
      "neutrino mixing angle",
      "predicts practically maximal atmospheric neutrino",
      "generic structure"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Elsevier",
      "journal": "Nucl. Phys. B"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 26,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 643332
    }
  }
}