Annihilation into Channels with Strangeness and the OZI Rule Violation

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Two-step mechanisms in the NN annihilation and their role in the OZI rule violating reactions are discussed. In particular the two meson rescattering mechanism for πϕ channel including all off-shell effects is typically two orders of magnitude bigger than the OZI tree level expectation and explains the observed ratio ϕπ/ωπ in the annihilation at rest. The rates for the final states including photons, γω and γϕ, can be explained in the vector dominance model. The observed rate for pp→γω is suppressed due to destructive interference between the intermediate ρ and ω states while the interference in pp→γϕ is required to be constructive leading to a large ratio γϕ/γω.