Pseudorapidity dependence of anisotropic flow in heavy ion collisions with ALICE

Abstract

The pseudorapidity dependence of flow coefficients, $v_n$, is presented over a large range in pseudorapidity ($-3.5\le \eta \le 5$) in Pb$-$Pb collisions at 5.02 TeV. The flow coefficients are measured with 2- and 4-particle cumulants with $|\Delta \eta |>0$ and $|\Delta \eta |>2$. The difference between $v_2\{2,|\Delta \eta |>0\}$ and $v_2\{2,|\Delta \eta |>2\}$ implies changes in either the de-correlation of flow vectors or non-flow effects between the two methods. The AMPT model shows a qualitative agreement with the measurements.