Cumulant Correlators and Azimuthal Correlations in PP Collisions at 400 GeV/c

The cumulant correlators and azimuthal correlations of particles produced in protonproton (PP) collisions at 400 GeV/c are investigated. The second-order cumulant correlators show that the two particle correlation length may be determined by comparing the experimental data with the Monte Carlo events sample which has same multiplicity distributions but no correlation. The azimuthal correlation has also been observed.