Evidence for coherent effects in large-angle hadron-hadron scattering

Abstract

We suggest, by looking at $pp$ and ${\pi }^{+}p$ elastic data, that the evidence for the parton prediction $\frac{d\sigma }{\mathrm{dt}}\sim s^{-n}f\left(\theta \right)$ is not as convincing as is generally supposed. We also draw attention to the presence of well-defined structures in ${\left(\frac{d\sigma }{\mathrm{dt}}\right)}_{\theta }$; these may well reveal a strong component of conventional coherent scattering effects, even at large angles.