Method for the Analysis of Forward-Backward Multiplicity Correlations in Heavy-Ion Collisions
Abstract
In heavy-ion ( A-A) collisions, the correlations among the particles produced across wide range in rapidity, probe the early stages of the reaction. The analyses of forward-backward multiplicity correlations in these collisions are complicated by several effects, which are absent or minimized in hadron-hadron collisions. This includes effects, such as the centrality selection in the A-A collisions, which interfere with the measurement of the dynamical correlations. A method, which takes into account the fluctuations in centrality selection, has been utilized to determine the forward-backward correlation strength b corr in -A collisions. This method has been validated by using the HIJING event generator in case of Au-Au collisions at sNN= 200 GeV and Pb-Pb collisions at sNN= 2.76 TeV. It is shown that the effect of impact parameter fluctuations is to be considered properly in order to obtain meaningful results.
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