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The elliptic flow of Lambda hyperons has been measured by the NA49collaboration at the CERN-SPS in semi-central Pb+Pb collisions at 158A GeV. Thestandard method of correlating particles with the event plane was used.Measurements of v2 near mid-rapidity are reported as a function of rapidity,centrality and transverse momentum. Elliptic flow of Lambda particles increasesboth with the impact parameter and with the transverse momentum. It is comparedwith v2 for pions and protons as well as with model calculations. Theobservation of significant elliptic flow and its mass dependence suggest strongcollective behaviour of the matter produced in collisions of heavy nucleialready at the SPS. Scaling properties of elliptic flow of different particlespecies have been tested at 158A GeV. The limited pT range of the data does notallow for a decisive test of the coalescence model.Comment: 6 pages, 6 figures, submitted to Physical Review

physical review. c. nuclear physics/physical review. c, nuclear physics

Elliptic flow of Λ hyperons in Pb+Pb collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>158</mml:mn><mml:mi>A</mml:mi></mml:mrow></mml:math>GeV

Elliptic flow of Λ hyperons in Pb+Pb collisions at158AGeV