Transverse momentum dependence of charged and strange hadron elliptic flows in Cu-Cu collisions

We investigate the dependence of elliptic flows nu(2) on transverse momentum P-T for charged and strange hadrons produced in Cu-Cu collisions by using a multi-source thermal model, which includes the interaction contribution of the emission sources. The magnitude of the expansion is denoted by a expansion factor k. Our calculated results are approximately in agreement with the experimental data in Cu-Cu collisions at root s(NN) = 62.4 and 200 GeV, measured by the STAR Collaboration. It is found that the expansion factor increases linearly with the impact parameter from the most central (0-10%) to mid-peripheral (40-50%) collisions.