Forwardp¯delastic scattering and total spin-dependentp¯dcross sections at intermediate energies

Abstract

Spin-dependent total $\overline{p}d$ cross sections are considered using the optical theorem. For this aim the full spin dependence of the forward $\overline{p}d$ elastic scattering amplitude is considered in a model independent way. The single-scattering approximation is used to relate this amplitude to the elementary amplitudes of $\overline{p}p$ and $\overline{p}n$ scattering and the deuteron form factor. A formalism allowing to take into account Coulomb-nuclear interference effects in polarized $\overline{p}d$ cross sections is developed. Numerical calculations for the polarized total $\overline{p}d$ cross sections are performed at beam energies 20--300 MeV using the $\overline{N}N$ interaction models developed by the J\ulich group. Double-scattering effects are estimated within the Glauber approach and found to be in the order of 10--20%. Existing experimental data on differential $\overline{p}d$ cross sections are in good agreement with the performed Glauber calculations. It is found that for the used $\overline{N}N$ models the total longitudinal and transversal $\overline{p}d$ cross sections are comparable in absolute value to those for $\overline{p}p$ scattering.