{
  "id": "hep-ph/0608203",
  "version": "v2",
  "published": "2006-08-18T15:32:58.000Z",
  "updated": "2006-11-23T14:20:05.000Z",
  "title": "Lepton flavor violation in muonium decay and muon colliders in models with heavy neutrinos",
  "authors": [
    "Gorazd Cvetic",
    "Claudio O. Dib",
    "Choong-Sun Kim",
    "JungDae Kim"
  ],
  "comment": "12 pages, 7 figures; new version recalculates the figures and results using the correlated bound on mu-e mixing from $B(\\mu\\to e\\gamma)$ (Eq.34)",
  "journal": "Phys.Rev.D74:093011,2006",
  "doi": "10.1103/PhysRevD.74.093011",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We study the lepton-flavor-violating reaction $\\mu^+ e^- \\to e^+ e^-$ within two extensions of the standard model that include heavy neutrinos. The reaction is studied in the low energy limit in the form of muonium decay $M\\to e^+ e^-$ and in the high energy regime of a muon collider. The two theoretical models we consider are: model I, a typical see-saw model that violates lepton flavor and number by inclusion of extra right handed neutrinos, and model II, a variant where lepton number is conserved and which includes extra right handed as well as left handed neutrinos, singlets under the gauge group. We find for muonium decay into $e^+e^-$ the extremely small result $Br(M\\to e^+ e^-) < 10^{-19}$ in both scenarios. Alternatively, for $\\mu^+ e^-$ collisions up to $\\sqrt{s}\\sim 50$ GeV we find $\\sigma(\\mu^+ e^- \\to e^+ e^-)< 10^{-5}$ fb, while for energies above the $W^+ W^-$ threshold we find $\\sigma(\\mu^+ e^- \\to W^+ W^-)$ up to 1 fb.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2006-11-23T14:20:05.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.60.Pq",
      "14.60.Ef",
      "14.60.St",
      "13.66.Lm"
    ],
    "keywords": [
      "lepton flavor violation",
      "muonium decay",
      "muon collider",
      "heavy neutrinos",
      "high energy regime"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 724064
    }
  }
}