Energy loss in high energy heavy ion collisions from the hydrodynamic and jet model

We investigate the effect of energy loss of jets in high energy heavy ion collisions by using a full three-dimensional space-time evolution of a fluid combined with (mini)jets that are explicitly evolved in space-time. In order to fit the ${\pi }^0$ data for the $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{s_{\mathrm{NN}}}=130\mathrm{}\mathrm{GeV},$ the space-time averaged energy loss $dE/dx(\tau <~3\mathrm{fm}/c)=0.36\mathrm{}\mathrm{G}\mathrm{e}\mathrm{V}/\mathrm{f}\mathrm{m}$ is extracted within the model. It is found that most energy loss occurs at the very early time less than $2\mathrm{fm}/c$ in the QGP phase and that energy loss in the mixed phase is negligible within our parametrization for jet energy loss. This is a consequence of strong expansion of the system.