Results from the NOMAD Experiment

The NOMAD experiment has been searching for νμ ↔ ντ oscillations by looking for the appearance of τ − in events from the CERN-SPS neutrino beam. With some improvements in the analysis techniques with respect to the previous published results and including data from 1998 run, no evidence for oscillations is found, resulting in an updated limit on the oscillation probability of P (νμ ↔ ντ ) < 0.5×10 −3 at 90% C.L. This corresponds to a limit on the oscillation mixing angle of sin 2θμτ < 1.0×10 −3 for large ∆m. By using the 1% contamination of νe in the neutrino beam we can also exclude νe ↔ ντ oscillations and set a limit on the probability of P (νe ↔ ντ) < 3×10 −2