Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-12-20
Phys.Rev.C79:034910,2009
Physics
Nuclear Physics
Nuclear Theory
12 pages, 6 figures
Scientific paper
10.1103/PhysRevC.79.034910
We discuss the effects of initial collision geometry and centrality bin definition on correlation and fluctuation observables in nucleus-nucleus collisions. We focus on the forward-backward correlation coefficient recently measured by the STAR Collaboration in Au+Au collisions at RHIC. Our study is carried out within two models: the Glauber Monte Carlo code with a `toy' wounded nucleon model and the hadron-string dynamics (HSD) transport approach. We show that strong correlations can arise due to averaging over events in one centrality bin. We, furthermore, argue that a study of the dependence of correlations on the centrality bin definition as well as the bin size may distinguish between these `trivial' correlations and correlations arising from `new physics'.
Bratkovskaya Elena L.
Gorenstein Mark I.
Hauer Michael
Konchakovski V. P.
Torrieri Giorgio
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