Hyperon production at the CERN SPS: results from the NA57 experiment

New results on strange baryon and antibaryon production in Pb\u2013Pb collisions at 40 and 160 GeV per nucleon are presented. In particular, we have increased significantly the statistics of the \u39e 12 and samples at 160 GeV per nucleon. The dependence of particle yields and spectra on collision centrality and energy of interaction is analysed

Results on 40 A GeV/c PbPb collisions from the NA57 experiment

The NA57 experiment has been designed to study the onset of the strange baryon and antibaryon enhancements in PbPb with respect to p-Be collisions, first observed by WA97 at 160 A GeV/c. NA57 has extended the WA97 measurements to investigate the evolution of strangeness enhancement over a wider centrality range and as a function of the beam energy. Results on hyperon production in central PbPb collisions at 40 A GeV/c are presented and compared with those obtained at higher energy, in the same centrality range