Model-independent decomposition of flow and nonflow in relativistic heavy-ion collisions

Details Model-independent decomposition of flow and nonflow in relativistic heavy-ion collisions Model-independent decomposition of flow and nonflow in relativistic heavy-ion collisions

2012-04-12

arxiv.org/abs/1204.2815v1

Physics

Nuclear Physics

Nuclear Experiment

16 pages, 15 figures, 1 table

Scientific paper

We propose a method to separate \Delta\eta-dependent and independent azimuthal correlations using two- and four-particle cumulants between pseudo-rapidity (\eta) bins in symmetric heavy-ion collisions. The \Delta\eta-independent correlation may be dominated by harmonic flows, a global correlation to the common collision geometry. The \Delta\eta-dependent correlation can be identified as nonflow, particle correlations unrelated to the common geometry. Our method exploits the \eta symmetry of the average harmonic flows and is model-independent. We use the AMPT and HIJING event generators to illustrate our method. We discuss the decomposed flow and nonflow of the models.

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