The data of di-hadron azimuthal correlations at different centralities for Au+Au collisions at 200 A$\,$GeV were presented by the PHENIX Collaboration.
It was observed that the away-side correlation evolves from double- to single-peak structure when the centrality decreases. In this work, we show, in terms of the peripheral tube model, that the observed features naturally appear due to an interplay between the flow due to the peripheral tube and the background elliptic flow. A key feature of the present approach is that the event-by-event fluctuating initial conditions is represented by the randomly distributed peripheral tubes. We also carry out numerical simulations by using the hydrodynamical code NeXSPheRIO,and calculate the correlations by the ZYAM method employed by PHENIX Collaboration. It is shown that our results are in reasonable agreement with the data. We also discuss the physical content of the present model and its difference from the viewpoint in terms of eccentricity-flow relationship.
|Preferred Track||Correlations and Fluctuations|