Neutral-pion photoproduction and proton Compton scattering at large angles

The differential cross sections for $\gamma p\to \gamma p$ and $\gamma p\to {\pi }^{0}p$ have been measured for incident photon energies in the range of 2 to 6 GeV and for $\mathrm{}\left|t\right|\mathrm{}$ ranging from 0.7 to 4.3 Ge${\mathrm{V}}^2$. This corresponds to a center-of-mass angle range of 45° to 128°. The energy dependence of the data is compared to that predicted by several parton models.