Abstract
We present STAR results on the elliptic flow of charged hadrons, strange and multistrange particles from GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis of with the Lee-Yang zero method for and Λ. In the relatively low region, , a scaling with is observed for identified hadrons in each centrality bin studied. However, we do not observe scaled by the participant eccentricity to be independent of centrality. At higher scales with quark number for all hadrons studied. For the multistrange hadron Ω, which does not suffer appreciable hadronic interactions, the values of are consistent with both scaling at low and number-of-quark scaling at intermediate . As a function of collision centrality, an increase of -integrated scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.
8 More- Received 23 January 2008
DOI:https://doi.org/10.1103/PhysRevC.77.054901
©2008 American Physical Society