FACTORIAL CUMULANT MOMENTS AND SHORT-RANGE CORRELATION IN P-P COLLISIONS AT 400-GEV C/

The pseudorapidity distribution of charged particles produced in p-p c ollisions at 400 GeV/c was measured by using the Lexan bubble chamber films offered by the CERN NA27 collaboration. The scaled factorial cum ulant moments have been calculated. The results show that the second o rder cumulants have positive values, while the cumulants of higher ord er are consistent with zero except for the case with n(ch) greater-tha n-or-equal-to 4 events, where the third-order cumulants have small pos itive values beyond the statistical uncertainties. From Monte Carlo ev ents with the same single particle spectrum and no correlations, we ob served that for broad mixed-multiplicity distributions, a significant part of K2 is coming from the single-particle fluctuation due to the f luctuation multiplicity.