New results from a search for $\nu_{\mu} \to \nu_{\tau}$ and $\nu_{e} \to \nu_{\tau}$ oscillation

Abstract

A first analysis of the complete set of data collected by CHORUS in the years 1994-1997 is presented. The search for \nut charged current events has been performed for both leptonic and hadronic decays of the \tauu lepton. No \tauu candidate has been found. A \numtonut mixing is excluded down to $\sin2t$ = $6.8 \times 10^{-4}$ for large \dm2 (90\%~C.L.)