Trace initial interaction from final state observable in relativistic heavy ion collisions
- Received Date: 2008-04-03
- Accepted Date: 2008-05-15
- Available Online: 2009-01-11
Abstract:
In order to trace azimuthal angle dependence of the initial interaction in ultra-relativistic heavy ion collision, two azimuthal multiplicity-correlation patterns
— neighboring and fixed-to-arbitrary angular-bin correlation patterns — are suggested. From the simulation of Au + Au collisions at √SNN=200 GeV by using the Monte Carlo models RQMD with hadron re-scattering and AMPT with and without string melting, we observe that the correlation patterns change
gradually from out-of-plane preferential one to in-plane preferential one when the centrality of collision shifts from the central collision to peripheral collision, meanwhile the anisotropic collective flow v2 keeps positive in all cases. This regularity is found to be collision energy independent. The physics behind the
two opposite trends of correlation patterns, in particular, the presence of out-of-plane correlation patterns at RHIC energy, are discussed.