Multiplicity distribution of p.bar.p interactions in the high-energy region

25K pictures of 15 GeV/c pp interactions have been analysed. It is found that the shape parameter W=(n)/D of charged multiplicity is equal to about 2, and that pi /sup 0/ production has positive correlation with pi /sup +or-/ production in the 15 GeV/c pp interactions. These two features are seen in the high-energy pp interactions above 100 GeV/c. The s-dependence of W for pp interactions from a few GeV/c to a few tens of GeV/c has a positive slope in contrast to the negative slope of pp interaction in the same energy region. It is shown, however, that neither the annihilation process nor the non-annihilation process has high-energy behaviour. These three features in pp interaction can be explained using the fact that pp interaction consists of two components of annihilation and non-annihilation together with the characteristics of the multiplicity of each component. (12 refs).