Abstract

The pseudorapidity distribution of charged particles produced in pp collisions at 400 GeV/ c was measured by using LEBC films offered by the CERN NA27 Collaboration. The scaled factorial cumulant moments have been calculated. The results shows that the second-order cumulants have positive values, while the cumulants of higher order are consistent with zero except for the situation of n ch ⩾ 4 events, where the third-order cumulants have positive values beyond the statistical uncertainties. It means that the observed increase of the higher-order factorial moments F q is almost due to the short range dynamical two-particle correlations in pp collisions at 400 GeV/ c.

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