Constraints on coupling constants through charged Sigma photoproduction.

The few available data for the reactions \ensuremath{\gamma}p\ensuremath{\rightarrow}${\mathit{K}}^{0}$${\mathrm{\ensuremath{\Sigma}}}^{+}$ and \ensuremath{\gamma}n\ensuremath{\rightarrow}${\mathit{K}}^{+}$${\mathrm{\ensuremath{\Sigma}}}^{\mathrm{\ensuremath{-}}}$ are compared to models developed for the processes \ensuremath{\gamma}p\ensuremath{\rightarrow}${\mathit{K}}^{+}$${\mathrm{\ensuremath{\Sigma}}}^{0}$ and \ensuremath{\gamma}p\ensuremath{\rightarrow}${\mathit{K}}^{+}$\ensuremath{\Lambda}. 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.