Abstract
A model incorporating virtual-meson diffraction scattering followed by a final-state resonant interaction of the meson with an emergent nucleon or isobar is proposed for the production of $I=\frac{1}{2}$ baryon resonances in the reaction $\mathrm{pp}\ensuremath{\rightarrow}p{{N}_{\frac{1}{2}}}^{*}$. Absolute predictions are compared with the experimental data relating to enhancements observed in missing-mass experiments. Agreement is favorable in the case of the ${P}_{11}(1470)$, but otherwise the many resonances predicted by phase-shift analyses complicate the issue and prevent a clear-cut test of the model. The proposed $\ensuremath{\Delta}P={(\ensuremath{-}1)}^{\ensuremath{\Delta}J}$ selection rule is discussed in relation to the large cross section predicted by the model for the "forbidden" ${S}_{11}(1150)$.
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