Multiparticle azimuthal correlations for extracting event-by-event elliptic and triangular flow in Au+Au collisions at = 200 GeV

Adare, A.*; Hasegawa, Shoichi   ; Imai, Kenichi; Sako, Hiroyuki   ; Sato, Susumu  ; Tanida, Kiyoshi   ; PHENIX Collaboration*; 317 of others*

We present measurements of elliptic and triangular azimuthal anisotropy of charged particles detected at forward rapidity in AuAu collisions at GeV, as a function of centrality. The multiparticle cumulant technique is used to obtain the elliptic flow coefficients , , , and , and triangular flow coefficients and . Using the small-variance limit, we estimate the mean and variance of the event-by-event distribution from and . In a complementary analysis, we also use a folding procedure to study the distributions of and directly, extracting both the mean and variance. Implications for initial geometrical fluctuations and their translation into the final state momentum distributions are discussed.