Comparison of longitudinal polarization of $\Lambda$ and $\bar\Lambda$   in deep-inelastic scattering at COMPASS
  The longitudinal polarization of Lambda and anti-Lambda hyperons produced in deep-inelastic scattering of 160 GeV/c polarized muons is studied in the COMPASS experiment. Preliminary results on x- and y- dependence of the longitudinal polarization of Lambda and anti-Lambda from data collected during the 2003 run are presented. 
M.G.Sapozhnikov (on behalf of the COMPASS Collaboration)