Forward-Backward Multiplicity Correlations in pp Collisions at 400GeV/c

The pseudo-rapidity distributions of charged particles produced in pp collisions at 400 GeV/c have been measured using LEBC films. The multiplicity distributions in forward hemisphere at fixed total multiplicities are obtained. The forward-backward multiplicity correlation strength in full phase space, central region and off-central region of the pseudo-rapidity distribution are calculated. The figures of the correlation strength versus pseudo-rapidity windows are obtained. The experimental data of the forward-backward correlation have been analyzed with cluster model. The results show that the average cluster size is dependent on whether the leading-particle effect is taken into account.