KS0 and. production in Pb-Pb collisions with the ALICE experiment

We present the study of K-S(0) and Lambda production performed with the ALICE experiment at the LHC in Pb-Pb collisions at root s(NN) = 2.76 TeV and pp collisions at root s = 0.9 and 7 TeV. The K-S(0) and Lambda particles are reconstructed via their V0 decay topology allowing their identification up to high transverse momenta. The corresponding baryon/meson ratios as a function of transverse momentum are extracted for Pb-Pb collisions in centrality bins and in the transverse momentum range from 1 to 6 GeV/c. They are also compared with those measured in pp events at the LHC energies of 0.9 and 7 TeV as well as in Au-Au collisions at root s(NN) = 62.4 and 200 GeV from RHIC.