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In the present work we investigate the source of azimuthal asymmetry fornuclear collision using a model that contemplates particles produced in theinitial hard collisions and the collective effects described by a Blast-Wavelike expansion. The latter is described by the relaxation time approximation ofthe Boltzmann transport equation. The parameters regarding collective flow andasymmetry are fitted by the experimental data from $p_T$ spectrum and $v_2$ forPbPb and XeXe collisions at different centrality classes. As a by-product theratio of final elliptic flow with the initial anisotropy, $v_2/\epsilon_2$, andthe average transverse momentum are predicted.

Study of the azimuthal asymmetry in heavy ion collisions combining initial state momentum orientation and final state collective effects