High-Energy Elastic Scattering of ${\pi }^{\pm }$, $K^{-}$, and $\overline{p}$ on Hydrogen at c.m. Angles from 22° to 180°

Elastic ${\pi }^{\pm }-p$, $K^{-}-p$, and $\overline{p}-p$ scattering cross sections have been measured using three different experimental arrangements covering the c.m. angular regions ∼20°-120°, ∼135°-169°, and ∼165°-180° at incident momenta from 6 to 17 GeV/c. In the region 130°-180°, only ${\pi }^{\pm }-p$ scattering was measured. In the angular region near 180°, the energy dependences and shapes of the $\pi -p$ backward peaks were determined up to crossed-momentum transfers of $u\sim -2\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. At all energies, the ${\pi }^{+}-p$ backward peak had a sharp dip at $u=-0.13\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$, with no similar effect in the ${\pi }^{-}-p$ case. Nearly complete angular distributions of ${\pi }^{-}-p$ elastic scattering from 20° to 180° have been obtained at 6 and 10 GeV/c. These results at 6 and 10 GeV/c as well as at 8 GeV/c reveal a sharp dip in ${\pi }^{-}-p$ scattering at $t=-3\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. Several structures in the form of dips or shoulders were seen in the $\overline{p}-p$ angular distributions also, with less pronounced structure observed in $K^{-}-p$ scattering. At fixed momentum transfer, all cross sections when expressed as $\frac{d\sigma }{\mathrm{dt}}$ appear to be decreasing with increasing energy.