Azimuthal Anisotropy of Identified Hadrons in 200 GeV Au+Au Collisions Original Research Article

The azimuthal anisotropy parameter v2 has been measured with high statistics for identified hadrons in View the MathML source Au+Au collisions with the STAR experiment. At high transverse momentum (pT) a strong v2 for π++π− and View the MathML source is observed. In the intermediate pT region, number-of-constituent-quark scaling was tested to high precision. A detailed comparison of v2 for the multi-strange hadrons ϕ, View the MathML source, and View the MathML source with other particle species substantiates the development of collectivity among partons in the early phase of the collisions at RHIC.