Abstract

The SELEX experiment (E781) is a 3-stage magnetic spectrometer for a high statistics study of hadroproduction of charm baryons out to large χ F using 650 GeV/ c 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 decay spectrometer; and 3-stage lead glass photon detector. Preliminary results on asymmetry for D s ±, D −, D ∗± and D 0/ D 0 produced by Σ −, π − beams at χ F > 0.2 are presented. The results show significant non-perrtubative effects that are not explained by any present model.

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