π+Photoproduction from Hydrogen with Linearly Polarized Photons at 12 GeV

Abstract

The process $\gamma +p\to {\pi }^{+}+n$ has been studied with 12-GeV linearly polarized photons for momentum transfer $t$ from - 0.04 to - 1.0 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The experiment used a coherent bremsstrahlung beam produced by a diamond crystal. The measured asymmetry, $\frac{(d{\sigma }_{\perp }-d{\sigma }_{\parallel })}{(d{\sigma }_{\perp }+d{\sigma }_{\parallel })}$, is positive throughout this $t$ range and is similar to measurements at lower energies.