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Multi-particle azimuthal correlations for extracting event-by-event elliptic and triangular flow in Au+Au collisions at sqrt(sNN)=200 GeV

We present measurements of elliptic and triangular azimuthal anisotropy of charged particles detected at forward rapidity 1<|η|<3 in Au + Au collisions at sNN=200 GeV, as a function of centrality. The multiparticle cumulant technique is used to obtain the elliptic flow coefficients v2{; ; 2}; ; , v2{; ; 4}; ; , v2{; ; 6}; ; , and v2{; ; 8}; ; , and triangular flow coefficients v3{; ; 2}; ; and v3{; ; 4}; ; . Using the small-variance limit, we estimate the mean and variance of the event-by-event v2 distribution from v2{; ; 2}; ; and v2{; ; 4}; ; . In a complementary analysis, we also use a folding procedure to study the distributions of v2 and v3 directly, extracting both the mean and variance. Implications for initial geometrical fluctuations and their translation into the final-state momentum distributions are discussed.

azimuthal correlations ; flow ; Au+Au ; PHENIX

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