InclusiveΔ++(1232)production in 200-GeV/cπ−pinteractions

Abstract

The production of ${\Delta }^{++}\mathrm{}\left(1232\right)\mathrm{}$ is investigated inclusively and semi-inclusively, and is compared with that of protons. We find differences in the Feynman $x$ distributions for $\Delta$'s and protons near $x=-1.0\mathrm{}$, which can be attributed to different exchange contributions in these processes. It is found that not all ${\Delta }^{++}$ come from the diffractively excited target proton. Density matrix elements of the ${\Delta }^{++}$ are in agreement with the predictions of the one-pion-exchange model with absorption.