Centrality Dependence of Two-Particle Correlations in Heavy Ion Collisions

Details Centrality Dependence of Two-Particle Correlations in Heavy Ion Collisions Centrality Dependence of Two-Particle Correlations in Heavy Ion Collisions

2009-07-28

arxiv.org/abs/0907.4805v3

Nucl.Phys.A830:809c-812c,2009

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee (

Scientific paper

10.1016/j.nuclphysa.2009.10.005

Data from the PHOBOS detector have been used to study two-particle correlations over a broad range of pseudorapidity. A simple cluster model parameterization has been applied to inclusive two-particle correlations over a range of centrality for both Cu+Cu and Au+Au collisions at sqrt(s_NN)=200GeV. Analysis of the data for Au+Au has recently been extended to more peripheral collisions showing that the previously-observed rise in cluster size with decreasing system size eventually reaches a maximum value. Model studies have been used to quantify the significant effect of limited detector acceptance on the extracted cluster parameters. In the case of Au+Au, correlations between a trigger particle with pT>2.5GeV and inclusive associated particles have also been studied. These reveal the presence of a `ridge' at small relative azimuthal angle which extends with roughly constant amplitude out to the largest relative pseudorapidity studied. The large phase-space coverage of the PHOBOS detector has enabled a quantitative understanding of the so-called `ZYAM' parameter used in the subtraction of the contribution of elliptic flow to these triggered correlations.

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