Strange and charged particle elliptic flow in Pb+Au collisions at 158 AGeV/c Original Research Article

We present Λ and π elliptic flow measurements from Pb+Au collisions at the highest SPS energy. The data, collected by the CERES experiment which covers η=2.05,2.70 with full azimuthal coverage and wide pT sensitivity up to 3.5 GeV/c, can be used to test hydrodynamical models and show sensitivity to the EoS. The value of v2 as a function of centrality and pT is presented. Values of v2 observed by STAR at RHIC are larger by about 1/3. Our measurements are compared to results from other SPS experiments and to hydrodynamical calculations. Huge statistics allows for a precise measurement of the differential pion elliptic flow.