Large-Angleπ−Proton Elastic Scattering at 14 and 23 GeV/c

Abstract

The differential cross section for ${\pi }^{-}-p$ elastic scattering has been measured at 13.8 and 22.6 GeV/c up to $-t=5\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The dips in the angular distribution at $-t\approx 0.8 \mathrm{and} 2.8$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ previously observed at lower momenta become less prominent at higher momentum. The $-t=2.8\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ dip is still observed at 13.8 GeV/c, but at 22.6 GeV/c it has become a sharp kink in the angular distribution. At large momentum transfers, $\frac{d\sigma }{\mathrm{dt}}$ at fixed $t$ is still decreasing with increasing $s$, but at a slower rate in the 14- to 23-GeV/c region than at lower momenta.