Hydrodynamic approach to the centrality dependence of di-hadron correlations

Abstract

Measurements of di-hadron azimuthal correlations at different centralities for Au+Au collisions at 200 AGeV were reported by the PHENIX Collaboration. The data were presented for different ranges of transverse momentum. In particular, it was observed that the away-side correlation evolves from double- to a single-peak structure when the centrality decreases. In this work, we show that these features naturally appear as due to an interplay between the centrality-dependent smooth background elliptic flow and the one produced by event-by-event fluctuating peripheral tubes. To compare with the PHENIX data, we also carry out numerical simulations by using a hydrodynamical code NeXSPheRIO, and calculate the correlations by both cumulant and the ZYAM method employed by PHENIX Collaboration. It is shown that our results are in reasonable agreement with the data. A brief discussion on the physical content of the present model and its difference from other viewpoint is also presented.

11 pages and 3 figures

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Cited by in corpus (6)

• Event-plane dependent di-hadron correlations with harmonic $v_n$ subtraction in a hydrodynamic model
• Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited
• On the peripheral-tube description of the two-particle correlations in nuclear collisions
• Hydrodynamic results on multiplicity fluctuations in heavy-ion collisions
• On statistical fluctuations in collective flows
• Centrality and transverse momentum dependence of dihadron correlations in a hydrodynamic model