{
  "id": "1301.7130",
  "version": "v2",
  "published": "2013-01-30T02:49:26.000Z",
  "updated": "2013-08-27T02:46:54.000Z",
  "title": "How good is μ-τsymmetry after results on non-zero θ_{13}?",
  "authors": [
    "Shivani Gupta",
    "Anjan S. Joshipura",
    "Ketan M. Patel"
  ],
  "comment": "References added; Matches the version accepted for publication in JHEP",
  "journal": "JHEP 09 (2013) 035",
  "doi": "10.1007/JHEP09(2013)035",
  "categories": [
    "hep-ph"
  ],
  "abstract": "Viability of the \\mu-\\tau interchange symmetry imposed as an approximate symmetry (1) on the neutrino mass matrix {\\cal M}_{\\nu f} in the flavour basis (2) simultaneously on the charged lepton mass matrix M_l and the neutrino mass matrix M_\\nu and (3) on the underlying Lagrangian is discussed in the light of recent observation of a non-zero reactor mixing angle \\theta_{13}. In case (1), \\mu-\\tau symmetry breaking may be regarded as small (less than 20-30%) only for the inverted or quasidegenerate neutrino mass spectrum and the normal hierarchy would violate it by a large amount. The case (2) is more restrictive and the requirement of relatively small breaking allows only the quasidegenerate spectrum. If neutrinos obtain their masses from the type-I seesaw mechanism then small breaking of the \\mu-\\tau symmetry in the underlying Lagrangian may result in a large breaking in {\\cal M}_{\\nu f} and even the hierarchical neutrino spectrum may also be consistent with mildly broken \\mu-\\tau symmetry of the Lagrangian. Neutrinoless double beta decay provides a good means of distinguishing above scenarios. In particular, non-observation of signal in future experiments such as GERDA would rule out scenarios (1) and (2).",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-08-27T02:46:54.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.60.Pq",
      "11.30.Hv",
      "14.60.St"
    ],
    "keywords": [
      "neutrino mass matrix",
      "quasidegenerate neutrino mass spectrum",
      "type-i seesaw mechanism",
      "charged lepton mass matrix",
      "underlying lagrangian"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Springer",
      "journal": "Journal of High Energy Physics",
      "year": 2013,
      "month": "Sep",
      "volume": 2013,
      "pages": 35
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1216903,
      "adsabs": "2013JHEP...09..035G"
    }
  }
}