Triangular flow in event-by-event ideal hydrodynamics in Au plus Au collisions at root S-NN=200A GeV

Abstract

The first calculation of triangular flow upsilon(3) in Au + Au collisions at root s(NN) = 200A GeV from an event-by-event (3 + 1) d transport + hydrodynamics hybrid approach is presented. As a response to the initial triangularity epsilon(3) of the collision zone, upsilon(3) is computed in a similar way to the standard event-plane analysis for elliptic flow upsilon(2). It is found that the triangular flow exhibits weak centrality dependence and is roughly equal to elliptic flow in most central collisions. We also explore the transverse momentum and rapidity dependence of upsilon(2) and upsilon(3) for charged particles as well as identified particles. We conclude that an event-by-event treatment of the ideal hydrodynamic evolution starting with realistic initial conditions generates the main features expected for triangular flow.