FORWARD-BACKWARD MULTIPLICITY CORRELATIONS IN PP COLLISIONS AT 400 GEV C/

The pseudorapidity distributions of charged particles produced in pp c ollisions at 400 GeV/c have been measured using LEBC films. The multip licity distributions in forward hemisphere at fixed total multipliciti es are obtained. The forward-backward multiplicity correlation strengt h in full-phase space, central region, and off-central region of the p seudorapidity distribution are calculated. The correlation strength ve rsus pseudorapidity windows are obtained. The experimental data of the forward-backward correlation have been analyzed with cluster model. T he results show that the average duster size is dependent on whether t he leading-particle effect is taken into account.