Lifetime of charmed particles photoproduced in nuclear emulsion

This chapter presents the data and results from an experiment concerning charm lifetime estimates performed at the CERN Super Proton Synchrotron (SPS). In the discussed WA58 experiment, 5000 single emulsion pellicles, 200 X 50 X 0.6 mm3, were exposed one after the other at an angle of 50 with respect to the direction of the incident tagged photon beam of the Omega Prime Spectrometer. Identification of particles is performed by using a Cerenkov gas counter for hadrons, and a lead-glass wall and shower detectors for electrons and photons. The geometry computer program TRIDENT simulates the recorded events, gives the track momentum and angles, and the vertex coordinates. Mean lifetime is calculated for the D /SUP O/ meson