Abstract
We analyze the forward-backward multiplicity correlation coefficient as measured by STAR. We show that in the most central Au $+$ Au collisions bins located symmetrically around $\ensuremath{\eta}=0$ with large separation in pseudorapidity are more strongly correlated than bins located asymmetrically with smaller separation. In proton-proton collisions the opposite effect is observed. It suggests a qualitatively different behavior of the two-particle correlation as a function of pseudorapidity sum in $p+p$ and Au+Au collisions.
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