Two-particle angular correlations in p+p and Cu+Cu collisions at PHOBOS

Details Two-particle angular correlations in p+p and Cu+Cu collisions at PHOBOS Two-particle angular correlations in p+p and Cu+Cu collisions at PHOBOS

2007-01-24

arxiv.org/abs/nucl-ex/0701055v1

J.Phys.G34:S1005-1010,2007

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 4 figures, presented at the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, "Quark Ma

Scientific paper

10.1088/0954-3899/34/8/S144

We present results on two-particle angular correlations in p+p and Cu+Cu collisions over a broad range of ($\eta$,$\phi$). The PHOBOS detector has a uniquely large angular coverage for inclusive charged particles. This allows for the study of correlations on both long and short range pseudorapidity scales. A complex two-dimensional correlation structure emerges which is interpreted in the context of a cluster model. The cluster size and its decay width are extracted from the two-particle pseudorapidity correlation function. Relative to p+p collisions, Cu+Cu reactions show a non-trivial decrease of cluster size with increasing centrality. These results may provide insight into the hadronization stage of the hot and dense medium created in heavy ion collisions.

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