Dependence of Elliptic Flow on Transverse Momentum in √s_NN=200 GeV Au-Au and √s_NN=2.76 TeV Pb-Pb Collisions

We investigate the dependence of elliptic flows v₂ on transverse momentum P_T for charged hadrons produced in nucleus-nucleus collisions at high energy by using a multi-source thermal model, where the contribution of source interactions is considered. Our calculated results are approximately in agreement with the experimental data over a wider P_T range from the PHENIX and ALICE collaborations. It is found that the expansion factor increases linearly with the impact parameter from most central (0–5%) to mid-peripheral (35–40%) collisions.