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Multiparticle azimuthal correlations for extracting event-by-event elliptic and triangular flow in Au+Au collisions at $$sqrt{s_{_{NN}}}$$ = 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 $$1 < |eta| < 3$$ in Au$$+$$Au collisions at $$sqrt{s_{_{NN}}}=200$$ GeV, as a function of centrality. The multiparticle cumulant technique is used to obtain the elliptic flow coefficients $$v_2{2}$$, $$v_2{4}$$, $$v_2{6}$$, and $$v_2{8}$$, and triangular flow coefficients $$v_3{2}$$ and $$v_3{4}$$. Using the small-variance limit, we estimate the mean and variance of the event-by-event $$v_2$$ distribution from $$v_2{2}$$ and $$v_2{4}$$. In a complementary analysis, we also use a folding procedure to study the distributions of $$v_2$$ and $$v_3$$ directly, extracting both the mean and variance. Implications for initial geometrical fluctuations and their translation into the final state momentum distributions are discussed.

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Category:Physics, Nuclear

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