Properties of the Tau-Neutrino

The ντ was postulated to exist after the discovery of the tau-lepton in 1975. First ντ CC interactions was observed in 2000 by the DONuT experiment at Fermilab, which also set a limit on the magnetic moment. Electron positron collider experiments have studied the tau-lepton decays and measured the Michel parameters, the tau lifetime, and the number of the light neutrino species. In addition a direct upper limit of the tau-neutrino mass was measured. This paper gives a short review of the known properties of the tau-neutrino, along with preliminary results from DONuT on the measurement of the ντ CC DIS cross section.