Abstract
The elliptic flow of Λ hyperons has been measured by the NA49 Collaboration at the CERN-SPS in semicentral Pb+Pb collisions at GeV. The standard method of correlating particles with the event plane was used. Measurements of near midrapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Λ particles increases both with the impact parameter and with the transverse momentum. It is compared with for pions and protons as well as with model calculations. The observation of significant elliptic flow and its mass dependence suggest strong collective behavior of the matter produced in collisions of heavy nuclei already at the SPS. Scaling properties of elliptic flow of different particle species have been tested at GeV. The limited range of the data does not allow for a decisive test of the coalescence model.
- Received 8 June 2006
DOI:https://doi.org/10.1103/PhysRevC.75.044901
©2007 American Physical Society