ANGULAR-DEPENDENCE OF FACTORIAL MOMENTS IN PI+ K+P INTERACTIONS AT 250 GEV C/

A sample of pi+p and K+p non-diffractive interactions at square-root s = 22 GeV is used to investigate factorial multiplicity moments as a f unction of the CMS opening angle theta between particles. The angular dependence is very different for unlike-charge and like-charge particl e combinations. For the latter, factorial moments increase with decrea sing opening angle approximately as a power law. The theta dependence is stronger for central production-angle intervals than in the forward and backward regions. The predictions of the standard version of the FRITIOF model deviate strongly from the data, but including Bose-Einst ein correlations leads to qualitative agreement.