Is there hydrodynamic flow at RHIC ?

Details Is there hydrodynamic flow at RHIC ? Is there hydrodynamic flow at RHIC ?

2008-04-18

arxiv.org/abs/0804.2932v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2figures

Scientific paper

It is argued that the observation of anisotropic azimuthal distribution of final state particles alone is insufficient to show whether the formed matter at RHIC behaves like hydrodynamic flow. Examining the intrinsic interaction (or correlation) of the formed matter should provide more definite judgement. To the end, a spatial-dependent azimuthal multiplicity-correlation pattern is suggested. It shows clearly in the pattern that there are two kinds of interactions at the early stage of Au + Au collisions at $\sqnn=200$ GeV generated by RQMD with hadron re-scattering and AMPT with string melting. This is out of the expectation from the elliptic flow driven by anisotropic expansion.

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