We study elliptic and triangular flow and their dependence on rapidity using 3+1D hydrodynamic simulations with initial conditions (Nexus) that contain realistic fluctuations in all 3 dimensions. We compare to experimental data from STAR and find that long range, two particle $v_3$ correlations agree reasonably well with measurements. We find that an apparent decrease of $v_3$ with pseudorapidity in traditional measurements is not, in fact, a dependence on $\eta$, which is negligible within the TPC acceptance, but instead is a dependence on relative pseudorapidity due to a lack of perfect correlation between $v_3$ at different rapidities. We also observe short-range correlations, due to rapidity dependent fluctuations in the initial condition. While the short-range correlation is slightly smaller in both magnitude and range, it serves as a demonstration that short-range correlations are not necessarily generated only by non-flow sources such as jets, but can have a significant contribution from purely hydrodynamic effects.
|Preferred Track||Correlations and Fluctuations|