Kai Xiao, Feng Liu, Fuqiang Wang
Within A Multi-Phase Transport model, we investigate decorrelation of event planes over pseudorapidity and its effect on azimuthal anisotropy measurements in relativistic heavy-ion collisions. The decorrelation increases with increasing pseudorapidity gap between the event planes. The third harmonic event planes are found even anticorrelated between forward and backward rapidity, the source of which may root in the opposite orientation of the collision geometry triangularities. The decorrelation calls into question the anisotropic flow measurements with pseudorapidity gap designed to reduce nonflow contributions.
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http://arxiv.org/abs/1208.1195
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