Results on Semileptonic and Hadronic Charm Decays
Experiments are now able to address detailed questions in charm decay by studying difficult decay modes that were inaccessible earlier. The important features of the two experiments discussed here, E-691 and NA-32, are high rates and silicon vertex detectors. The Fermilab photoproduction experiment E-691 used tagged photons of energy 80–230 GeV, and recorded 108 events from which 104 charm events were reconstructed. The beam for CERN hadroproduction experiment NA-32 was 230 GeV/c π-. The trigger selected events with a pK- or K+K- pair and led to a sample of 1200 reconstructed charm events in 20 decay modes.
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