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New results from a search for and oscillation
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 = for large \dm2 (90\%~C.L.)