Total and partialp¯dcross sections from 0.26 to 0.47 GeV/c

Abstract

The $\overline{p}d$ total cross section is ∼10% larger than the $A+\frac{B}{P}$ extrapolated cross section seen at higher (∼0.5-2.0 GeV/c) momenta. The excess is mainly due to the nonannihilation part of the total cross section. The $\overline{p}d$ annihilation cross sections in ${\mathrm{H}}_2$ and ${\mathrm{D}}_2$ are the same. These observations are consistent with known properties of the $\overline{N}N\left(1897\right)\mathrm{}$. A $3\sigma$ dip is present at ∼0.43 GeV/c mainly due to $p\overline{p}$ annihilation. This dip cannot be understood in terms of a single resonance at $\overline{N}N\left(1897\right)\mathrm{}$ and the $S\left(1935\right)\mathrm{}$. Our cross sections are ∼10-20% higher than the recent measurements of Hamilton et al.