System size dependence of two-particle angular correlations in p+p, Cu+Cu and Au+Au collisions

Details System size dependence of two-particle angular correlations in p+p, Cu+Cu and Au+Au collisions System size dependence of two-particle angular correlations in p+p, Cu+Cu and Au+Au collisions

2008-04-15

arxiv.org/abs/0804.2471v2

J.Phys.G35:104142,2008

Physics

Nuclear Physics

Nuclear Experiment

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

Scientific paper

10.1088/0954-3899/35/10/104142

We present a systematic study of two-particle angular correlations in p+p, Cu+Cu and Au+Au collisions over a broad range of pseudorapidity and azimuthal angle. The PHOBOS detector has a uniquely large angular coverage for inclusive charged particles, which allows for the study of correlations on both long- and short-range 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. The cluster size found in semi-central Cu+Cu and Au+Au collisions is comparable to that found in p+p but a non-trivial increase of cluster size with decreasing centrality is observed. Moreover, the comparison between Cu+Cu and Au+Au systems shows an interesting scaling of the cluster size with the measured fraction of total cross section (which is related to $b/2R$), suggesting a geometric origin. These results should provide insight into the hadronization stage of the hot and dense medium created in heavy ion collisions.

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