Measurement of transverse Lambda and Antilambda polarization at COMPASS

New data on hyperon polarization in semi-inclusive deep inelastic scattering have been collected by the COMPASS collaboration at CERN during the years 2002-2004, using a beam of longitudinally polarized muons of 160 GeV/c and a $^{6}$LiD target that can be polarized both longitudinally and transversely. The various combinations of beam and target polarizations allow for the study of a wide variety of hyperon polarization effects. Here we present preliminary results on the transverse polarization of $\Lambda$ and $\bar{\Lambda}$ produced both with unpolarized and transversely polarized deuteron targets.