Photoproduction ofπ−Δ++(1236)from Hydrogen from 5 TO 16 GeV

The cross section for $\gamma p\to {\pi }^{-}{\Delta }^{++}\mathrm{}\left(1236\right)\mathrm{}$, measured at 5, 8, 11, and 16 GeV from nearzero momentum transfer to -1 ${\mathrm{GeV}}^2$ (-2 ${\mathrm{GeV}}^2$ at 16 GeV), rises from small $t$ to a maximum near $-t={m_{\pi }}^2$, then falls as $e^{12t}$ out to $-t\approx 0.2$ ${\mathrm{GeV}}^2$, after which it becomes roughly equal in slope and magnitude to the single ${\pi }^{+}$ photoproduction cross section ($e^{3t}$). At fixed $t$, the cross section varies as $k^{-2\mathrm{}}$, where $k$ is the laboratory photon energy. The results do not agree well with the simple vector-dominance model.