Measurement of charm production and decay properties by CHORUS

The CHORUS experiment was designed to search for νμ→ντ oscillation in the range of interest for dark matter by detecting the decay topology of the τ in charged-current (CC) ντ events. The CHORUS hybrid apparatus consists of an active nuclear emulsion target and electronic detectors. It was exposed to the CERN/SPS Wide Band Neutrino Beam in the years 1994/1997. With the improved performance of the automated emulsion scanning systems, it has become possible to perform large volume scanning around the located interaction vertex. All tracks belonging to it can thus be recognized and precisely measured. This technique has been applied to search for νμ→ντ oscillation as well as for the recognition of events where charmed particles are produced. By using this technique, 2013 charm hadrons have been found on 93807 CC events. Here we report on new measurements based on these data. Finally, we give the prospects for the study of charm-production induced by neutrinos with the CHORUS experiment. (author)