Journal
PHYSICS LETTERS B
Volume 696, Issue 5, Pages 499-504Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2011.01.013
Keywords
Heavy-ion collisions; Dihadron correlations; Flow
Funding
- Fundacao de Amparo Pesquisa do Estado de Sao Paulo (FAPESP)
- Agence Nationale de la Recherche [ANR-08-BLAN-0093-01]
- Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0093] Funding Source: Agence Nationale de la Recherche (ANR)
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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 pseudorapidity. 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. (C) 2011 Elsevier B.V. All rights reserved.
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