$\rho$-Exchange Mechanism in the Reaction ${\pi }^{+}+p\to {N_{33}}^{*++}+{\pi }^0$

We report a study of the reaction ${\pi }^{+}+p\to {N_{33}}^{*++}+{\pi }^0$ at 3.54 BeV/c. We find very good agreement between the angular correlations observed in the decay of the ${N_{33}}^{*}$ and the predictions by Stodolsky and Sakurai based on a single-$\rho$-exchange model. The reaction $K^{+}+p\to {N_{33}}^{*++}+K^0$ has been found to display similar angular correlations, in agreement with the single-$\rho$-exchange mechanism. But we want to point out that the measured cross sections of both reactions decrease rapidly with increasing incident momentum, in contradiction with the results derived from a simple-$\rho$-exchange model as used, for example, by Jackson and Pilkuhn.