Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-11-26
Phys.Lett.B696:499-504,2011
Physics
Nuclear Physics
Nuclear Theory
6 pages, 2 figures; v2 - expanded explanation in Section III, version accepted for publication
Scientific paper
10.1016/j.physletb.2011.01.013
Making use of recently released data on dihadron correlations by the STAR collaboration, I analyze the long-range ("ridge-like") part of these data and show that the dependence on both transverse momentum as well as orientation with respect to the event plane are consistent with correlations expected from only collective flow. In combination with previously analyzed centrality-dependent data, they provide strong evidence that only collective flow effects are present at large relative pseudorapidy. In contrast, by analyzing a "background subtracted" signal, the authors presenting the new data concluded that the ridge-like part of the measured correlation could not in fact be entirely generated from collective flow of the medium. I explain the discrepancy and illustrate some pitfalls of using the ZYAM prescription to remove flow background.
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