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Measurements of $\gamma p \rightarrow K^{+} \Lambda$ and $\gamma p\rightarrow K^{+} \Sigma^0$ cross-sections have been obtained with the photontagging facility and the Crystal Ball calorimeter at MAMI-C. The measurementuses a novel $K^+$ meson identification technique in which the weak decayproducts are characterized using the energy and timing characteristics of theenergy deposit in the calorimeter, a method that has the potential to beapplied at many other facilities. The fine center-of-mass energy ($W$)resolution and statistical accuracy of the new data results in a significantimpact on partial wave analyses aiming to better establish the excitationspectrum of the nucleon. The new analyses disfavor a strong role forquark-diquark dynamics in the nucleon.

$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution