Abstract
The SELEX experiment (E781) is a 3-stage magnetic spectrometer for a high statistics study of hadroproduction of charm baryons out to large x F using 650 GeV Σ −, π − and p beams. The main features of the spectrometer are: a high precision silicon vertex system; powerful particle identification provided by TRD and RICH; forward Λ s decay spectrometer; and 3-stage lead glass photon detector. Preliminary results on asymmetry for Λ c produced by Σ −, π − and p beams at x F > 0.2 and precise measurements of the Λ c , D 0, and preliminary D s lifetimes are presented.
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