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Energy dependence of longitudinal flow decorrelation from STAR

Measurements of longitudinal flow decorrelations for charged particles are presented in the pseudorapidity range $|η| < 1$ using a reference detector at 2.1 $< |η_{\mathrm{ref}}| <$ 5.1 in Au+Au collisions at $\sqrt{s_{NN}}$ = 27 GeV by STAR. The flow decorrelation for $v_2$ shows a strong centrality dependence, while a weak centrality dependence for $v_3$. Results are compared with the results in Au+Au collisions at 200 GeV as a function of $η$ scaled by beam-rapidity, i.e. $η/y_{beam}$. No energy dependence is observed for $v_2$ decorrelation, but clear energy dependence for $v_3$ decorrelation. These results provide new insights into the longitudinal structure of the initial-state geometry in heavy-ion collisions.