LAMBDA-PRODUCTION, XI-PRODUCTION AND OMEGA-PRODUCTION IN PB-PB COLLISIONS AT 158 A-GEV C/

Enhanced production of strange baryons and anti-baryons at central rap idity in S-W and S-S with respect to p-A reactions has been reported b y the CERN experiments WA85 and WA94. The WA97 experiment is extending such a study to Pb-Pb collisions making use of the newly developed si licon pixel detectors. Results on Lambda, Xi(-) and Omega(-) productio n in Pb-Pb collisions at 158 A GeV/c at central rapidity are presented . Transverse mass spectra and particle ratios are presented. Hyperon y ields are given as a function of the collision centrality and compared with those obtained from p-Pb collisions using the same experimental setup.