Constraints on coupling constants through charged Σ photoproduction

The few available data for the reactions γp→${\mathit{K}}^0$ ${\mathrm{\Sigma }}^{+}$ and γn→${\mathit{K}}^{+}$ ${\mathrm{\Sigma }}^{\mathrm{-}}$ are compared to models developed for the processes γp→${\mathit{K}}^{+}$ ${\mathrm{\Sigma }}^0$ and γp→${\mathit{K}}^{+}$Λ. It is found that some of these phenomenological models overpredict the measurements by up to a factor of 100. Fitting the data for all of these reactions leads to drastically reduced Born coupling constants.