Final states with a neutral meson and a π+π− or pp pair in pp interactions at 7.2 GeV/c

Cross sections are reported for $\text{p}\text{p}$ interactions at 7.2 GeV/c beam momentum yielding one of the mesons ?⁰, ω, ?, η or η′; together with a gp⁺π^? pair or a $\text{p}\text{p}$ pair. Results are compared with data on similar $\text{p}\text{p}$ interactions at other beam momenta. The angular distributions for the final states with a ?⁰ or ω clearly show a peripheral behaviour. Our results may be understood within the framework of the quark model, but differ from the predictions of the quark rearrangement model. Deviations from ideal mixing of vector mesons are discussed. The energy dependence of ?⁰ and ω production is compared with that of analogous pp and π^±p interactions.