Two-Particle Correlations in Inclusive and Semi-inclusiveπ−pReactions at 200 GeV/c

Significant two-particle correlations of dynamical origin are observed in 200 GeV/c ${\pi }^{-}p$ inclusive interactions. This is demonstrated by comparison with kinematic correlations calculated from an independent-particle-emission model. Two distinct correlation types are observed: (a) unlike-particle correlations with correlation length ∼ 1.3 rapidity units independent of azimuthal separation, and (b) like-particle correlations with correlation length ∼ 0.4 rapidity units which are observed only for small azimuthal separations.