Some features of the reactionpp→Δ++(1236)nat 6 GeV/c

Approximately 12 000 examples of the reaction $pp\to {\Delta }^{++}\mathrm{}\left(1236\right)\mathrm{}n$ have been identified at 6 GeV / c in a spark-chamber experiment performed at the Argonne National Laboratory Zero Gradient Synchrotron. The experimental invariant-mass and momentum-transfer-squared distributions are in agreement with predictions of the Chew-Low one-pion-exchange model, suitably modified to account for form factors or absorption. The data have been extrapolated from the physical region to the pion pole. It is found that the Dürr-Pilkuhn and Benecke-Dürr models, in conjunction with quadratic extrapolations in $t$, reproduce the known on-mass-shell dependence of the cross section for the elastic ${\pi }^{+}p$ scattering.