Vector-Dominance Model Comparison ofπ+Photoproduction withρ0Production by Pions

Abstract

A comparison of the reactions $\gamma p\to {\pi }^{+}n$ and ${\pi }^{-}p\to {\rho }^{0}n$ at 4 and 8 GeV/c has been made using the vector-dominance model. Although the ${\rho }^0$ data are insufficient to show the very narrow forward peak observed in the photoproduction data, agreement is obtained to within errors for $\mathrm{}\left|t\right|\mathrm{}\lesssim 0.1$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. Taking interference effects into account, this agreement can be extended to $\mathrm{}\left|t\right|\mathrm{}\approx 1.5$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ at 4 GeV/c, but only to 0.3 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ at 8 GeV/c.