Collective flow and long-range correlations in relativistic heavy ion collisions |
| |
Authors: | Matthew Luzum |
| |
Affiliation: | CEA, Institut de physique théorique de Saclay (IPhT), F-91191 Gif-sur-Yvette, France |
| |
Abstract: | 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. |
| |
Keywords: | Heavy-ion collisions Dihadron correlations Flow |
本文献已被 ScienceDirect 等数据库收录! |
|