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Elliptic flow holds much promise for studying the early-time thermalizationattained in ultrarelativistic nuclear collisions. Flow measurements alsoprovide a means of distinguishing between hydrodynamic models and calculationswhich approach the low density (dilute gas) limit. Among the effects that cancomplicate the interpretation of elliptic flow measurements are azimuthalcorrelations that are unrelated to the reaction plane (non-flow correlations).Using data for Au + Au collisions at sqrt{s_{NN}} = 130 GeV from the STAR TPC,it is found that four-particle correlation analyses can reliably separate flowand non-flow correlation signals. The latter account for on average about 15%of the observed second-harmonic azimuthal correlation, with the largestrelative contribution for the most peripheral and the most central collisions.The results are also corrected for the effect of flow variations withincentrality bins. This effect is negligible for all but the most central bin,where the correction to the elliptic flow is about a factor of two. A simplenew method for two-particle flow analysis based on scalar products isdescribed. An analysis based on the distribution of the magnitude of the flowvector is also described.Comment: minor text change

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

Elliptic flow from two- and four-particle correlations in Au+Au collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:msqrt></mml:mrow><mml:mrow><mml:mrow><mml:mrow /></mml:mrow></mml:mrow><mml:mo>=</mml:mo><mml:mn>130</mml:mn><mml:mn /><mml:mi /><mml:mi mathvariant="normal">GeV</mml:mi></mml:…

Elliptic flow from two- and four-particle correlations in Au+Au collisions atsNN=130GeV