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We study the effect of separate chemical and kinetic freeze-outs to the idealhydrodynamical flow in Au+Au collisions at RHIC (sqrt(s_NN) = 200 GeV energy).Unlike in earlier studies we explore how these effects can be counteracted bychanges in the initial state of the hydrodynamical evolution. We conclude thatthe reproduction of pion, proton and antiproton yields necessitates a chemicalfreeze-out temperature of T = 150 MeV instead of T = 160 - 170 MeV motivated bythermal models. Unlike previously reported, this lower temperature makes itpossible to reproduce the p_T-spectra of hadrons if one assumes very smallinitial time, tau_0 = 0.2 fm/c. However, the p_T-differential elliptic flow,v_2(p_T) remains badly reproduced. This points to the need to includedissipative effects (viscosity) or some other refinement to the model.

Chemical freeze-out temperature in hydrodynamical description of Au+Au collisions at sqrt(s_NN) = 200 GeV