Like- and Unlike-Charged Pion Correlations in π+p and pp Interactions at 100 GeV/c

Charged-pion rapidity correlations are compared and found to have a similar peaked structure when studied inclusively. However, when the same data are studied semi-inclusively no correlation is found for like-charged pions and for unlike-charged pions in the central region. Inclusive correlations in these cases appear then from the convolution of the uncorrelated spectra at each multiplicity and the multiplicity distribution. Correlation in ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is observed at small $\ensuremath{\Delta}y$ only for $y$ large.