摘要
We introduce a pre-hydrodynamic correction to the commonly used Glauber model to bring the random scattering information to the initial condition of the hydrodynamic description for the heavy ion collisions.The results of this correction obviously shrink the value of the elliptic flow in the medium momentum region and move the corresponding momentum of the maximum v 2 forwards to smaller p T value.These fit the experimental data quite well.This correction implies that the quark-gluon plasma(QGP) has reached the thermal equilibrium when the hydrodynamic expansion starts.Such a conclusion of quick-equilibrium confirms the conclusion that QGP is a strongly interacting system.
We introduce a pre-hydrodynamic correction to the commonly used Glauber model to bring the random scattering information to the initial condition of the hydrodynamic description for the heavy ion collisions. The results of this correction obviously shrink the value of the elliptic flow in the medium momentum region and move the corresponding momentum of the maximum v2 forwards to smaller pT value. These fit the experimental data quite well. This correction implies that the quark-gluon plasma （QGP） has reached the thermal equilibrium when the hydrodynamic expansion starts. Such a conclusion of quick-equilibrium confirms the conclusion that QGP is a strongly interacting system.
基金
supported by the National Natural Science Foundation of China (Grant Nos. 10775069,10935001 and 11075075)
the Research Fund for the Doctoral Program of Higher Education (Grant No.200802840009)
the Priority Academic Program Development of Jiangsu Higher Education Institution
