{
  "id": "hep-ph/9310349",
  "version": "v1",
  "published": "1993-10-26T03:47:52.000Z",
  "updated": "1993-10-26T03:47:52.000Z",
  "title": "Closing the Windows on Mev Tau Neutrinos",
  "authors": [
    "K. S. Babu",
    "T. M. Gould",
    "I. Z. Rothstein"
  ],
  "comment": "8 pgs. LaTeX (1 uuencoded fig., also available on request), Bartol-930XXX, JHU-TIPAC-930026, UM-TH-93-26",
  "journal": "Phys.Lett.B321:140-144,1994",
  "doi": "10.1016/0370-2693(94)90340-9",
  "categories": [
    "hep-ph"
  ],
  "abstract": "In this note, we analyze various constraints on the ``visible'' decay modes of a massive $\\tau $ neutrino, $\\nu_\\tau\\rightarrow\\nu^\\prime\\,\\gamma $ and $\\nu_\\tau\\rightarrow\\nu^\\prime\\, e^+ e^-$, where $\\nu^\\prime$ is a light neutrino. The BEBC beam dump experiment provides model-independent constraints on these modes. The lifetime for the $\\nu^\\prime\\, e^+e^-$ mode is constrained to be $\\tau_{\\nu^\\prime\\, e^+e^-} \\ge 0.18~(m_{\\nu_\\tau}/MeV)~sec.$ We point out that the same experiment implies a similar constraint on the $\\nu^\\prime\\,\\gamma$ mode. This results in a new upper limit on the transition magnetic moment of $\\nu_\\tau$, $\\mu_{\\rm tran} \\le 1.1 \\times 10^{-9} (MeV/m_{\\nu_\\tau})^2 \\mu_B $. Furthermore, a limit on the electric charge of $\\nu_\\tau$ may be obtained, $Q_{\\nu_\\tau} \\le 4 \\times 10^{-4}e$. Combining these constraints with those arising from supernova observations and primordial nucleosynthesis calculations, we show that these ``visible'' decays cannot be the dominant decay modes of the $\\tau$ neutrino.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1993-10-26T03:47:52.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "mev tau neutrinos",
      "constraint",
      "bebc beam dump experiment",
      "transition magnetic moment",
      "primordial nucleosynthesis calculations"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 359417
    }
  }
}