Quasi-Two-Body Final States Produced inπ+pInteractions Between 3 and 4 GeV/c

Abstract

Cross sections and angular distributions for the quasi-two-body final states $N^{*++}{\rho }^0$, $N^{*++}{\omega }^0$, and $N^{*++}{\eta }^0$ were measured at five incident ${\pi }^{+}$ momenta between 3 and 4 GeV/c. These cross sections, when combined with results at higher momenta, indicate that the momentum dependence of the $N^{*++}{\rho }^0$ cross section deviates from that expected for a meson-exchange reaction, and that there is shrinking of the diffraction peak. Dips in the production angular distributions are observed, similar to those observed in two-body final states.