Abstract
Results of a combined analysis are presented for the production of $\ensuremath{\omega}$ and $\ensuremath{\varphi}$ mesons in $\ensuremath{\pi}N$ reactions in the near-threshold region using a conventional ``nonstrange'' dynamics based on processes that are allowed by the nonideal $\ensuremath{\omega}\ensuremath{-}\ensuremath{\varphi}$ mixing. We show that the interferences of the t channel (meson exchange) and s, u channels (nucleon and nucleon-resonances) differ significantly for the $\ensuremath{\omega}$ and $\ensuremath{\varphi}$ production amplitudes. This leads to a decrease of the relative yields, in comparison with the expectations based on a one-component amplitude with standard $\ensuremath{\omega}\ensuremath{-}\ensuremath{\varphi}$ mixing. We find a strong and nontrivial difference between observables in $\ensuremath{\omega}$ and $\ensuremath{\varphi}$ production reactions caused by the different roles of the nucleon and nucleon-resonance amplitudes. A series of predictions for the experimental study of this effect is presented.
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