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We present STAR measurements of azimuthal anisotropy by means of the two- andfour-particle cumulants $v_2$ ($v_2\{2\}$ and $v_2\{4\}$) for Au+Au and Cu+Cucollisions at center of mass energies $\sqrt{s_{_{\mathrm{NN}}}} = 62.4$ and200 GeV. The difference between $v_2\{2\}^2$ and $v_2\{4\}^2$ is related to$v_{2}$ fluctuations ($\sigma_{v_2}$) and nonflow $(\delta_{2})$. We present anupper limit to $\sigma_{v_2}/v_{2}$. Following the assumption that eccentricityfluctuations $\sigma_{\epsilon}$ dominate $v_2$ fluctuations$\frac{\sigma_{v_2}}{v_2} \approx \frac{\sigma_{\epsilon}}{\epsilon}$ we deducethe nonflow implied for several models of eccentricity fluctuations that wouldbe required for consistency with $v_2\{2\}$ and $v_2\{4\}$. We also presentresults on the ratio of $v_2$ to eccentricity.

physical review. c. nuclear physics/physical review. c, nuclear physics

Energy and system-size dependence of two- and four-particle $v_2$  measurements in heavy-ion collisions at RHIC and their implications on flow  fluctuations and nonflow