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A data-driven method was applied to measurements of Au+Au collisions at$\sqrt{s_{_{\rm NN}}} =$ 200 GeV made with the STAR detector at RHIC to isolatepseudorapidity distance $\Delta\eta$-dependent and $\Delta\eta$-independentcorrelations by using two- and four-particle azimuthal cumulant measurements.We identified a component of the correlation that is $\Delta\eta$-independent,which is likely dominated by anisotropic flow and flow fluctuations. It wasalso found to be independent of $\eta$ within the measured range ofpseudorapidity $|\eta|<1$. The relative flow fluctuation was found to be $34\%\pm 2\% (stat.) \pm 3\% (sys.)$ for particles of transverse momentum $p_{T}$less than $2$ GeV/$c$. The $\Delta\eta$-dependent part may be attributed tononflow correlations, and is found to be $5\% \pm 2\% (sys.)$ relative to theflow of the measured second harmonic cumulant at $|\Delta\eta| > 0.7$.

physics letters b

Isolation of Flow and Nonflow Correlations by Two- and Four-Particle  Cumulant Measurements of Azimuthal Harmonics in $\sqrt{s_{_{\rm NN}}} =$ 200  GeV Au+Au Collisions