Charge Asymmetries for D, D_s and Lambda_c Production in Sigma- -   Nucleus Interactions at 340 GeV/c
  CERN experiment WA89 has studied charmed particles produced by a Sigma^- beam at 340 GeV/c on nuclear targets. Production of particles which have light quarks in common with the beam is compared to production of those which do not. Considerable production asymmetries between D^- and D^p, D_s^ and D_s^+ and Lambda_c and Antilambda_c are observed. The results are compared with pion beam data and with theoretical calculations. 
The WA89 Collaboration, M.I.Adamovich et al