STAR Collaboration2015-07-132015-07-132015STAR Collaboration. "Isolation of flow and nonflow correlations by two- and four-particle cumulant measurements of azimuthal harmonics in √sNN=200 GeV Au+Au collisions." <i>Physics Letters B,</i> 745, (2015) Elsevier: 40-47. http://dx.doi.org/10.1016/j.physletb.2015.04.033.https://hdl.handle.net/1911/80956A data-driven method was applied to Au+Au collisions at √sNN=200 GeV made with the STAR detector at RHIC to isolate pseudorapidity distance Δη-dependent and Δη-independent correlations by using two- and four-particle azimuthal cumulant measurements. We identified a Δη-independent component of the correlation, which is dominated by anisotropic flow and flow fluctuations. It was also found to be independent of η   within the measured range of pseudorapidity |η|<1. In 20–30% central Au+Au collisions, the relative flow fluctuation was found to be 34%±2%(stat.)±3%(sys.) for particles with transverse momentum pT less than 2 GeV/c. The Δη  -dependent part, attributed to nonflow correlations, is found to be 5%±2%(sys.) relative to the flow of the measured second harmonic cumulant at |Δη|>0.7.engThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)Journal articleheavy-ionflownonflowhttp://dx.doi.org/10.1016/j.physletb.2015.04.033