Forward-backward multiplicity correlations at the LHC from independent sources

摘要

It is argued that the superposition approach, where partons are independentlyemitted from longitudinally extended sources in the early stage, is fullycompatible with the experimental results for the forward-backward multiplicitycorrelations in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76 \textrm{ TeV}$. Thepertinent correlation analysis is based on the PhD Thesis of Ref. [1], whichincludes an unpublished analysis of data taken by the ALICE Collaboration. Ourcalculations show that in the experimentally covered pseudorapidity range$\Delta \eta=1.2$, the initial sources in the backward and forward bins aremaximally correlated, which complies to the string-like interpretation of theunderlying early-stage production mechanism.