Triangular flow and nonflow by 2-, 4-, and 6-particle cumulants from STAR

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 33
Poster Global and collective dynamics


Li Yi (Purdue University)


Triangular flow (v3) can arise from event-by-event fluctuations. Its connection to fluctuations in the initial state collision geometry may reveal hydrodynamic information of the collision system. Theoretical studies suggest its sensitivity to hydrodynamic evolution may even be stronger than elliptic flow (v2). We present v3 measurement by the 2-, 4-, and 6-particle cumulant method at $\sqrt{s_{NN}}$ = 200 GeV in Au+Au collisions by STAR. We compare our v3 results to v2, also from the multiparticle cumulant method. The 2-particle cumulant result contains nonflow contribution. We assess the nonflow effect by separating charges as well as applying a pseudo-rapidity gap. The 4- and 6-particle v3 results are strongly affected (perhaps dominated) by v3 fluctuations. Assuming Gaussian flow fluctuation, we further attempt to distinguish flow, flow fluctuation, and nonflow.

Primary author

Li Yi (Purdue University)

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