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In a recent paper, the hydrodynamic code NeXSPheRIO was used in conjunctionwith STAR analysis methods to study two-particle correlations as function ofDelta_eta and Delta_phi. Both the ridge-like near-side and the double-humpaway-side structures were obtained. However, the mechanism of ridge productionwas not clear. In order to understand it, we study a simple model with only onehigh-energy density peripheral tube in a smooth cylindrical back-ground, withlongitudinal boost invariance. The results are rather surprising, but the modeldoes produce the triple-ridge structure with one high ridge plus two lower onesplaced symmetrically with respect to the former one. The shape of thisstructure is rather stable in a wide range of parameters.

Trying to understand the ridge effect in hydrodynamic model