Forward antiproton-deuteron elastic scattering and total spin-dependent antiproton-deuteron cross sections at intermediate energies

TL;DR

This paper investigates spin-dependent antiproton-deuteron scattering at intermediate energies using a model-independent approach, providing numerical estimates and accounting for Coulomb effects, with results aligning well with existing experimental data.

Contribution

It introduces a formalism for spin-dependent pbar-d scattering, including Coulomb interference, and provides numerical estimates using Nbar-N models and Glauber theory.

Findings

Double-scattering effects are about 10-20%.

Total spin-dependent cross sections are comparable to pbar-p scattering.

Good agreement with existing experimental data.

Abstract

Spin-dependent total pbar-d cross sections are considered using the optical theorem. For this aim the full spin dependence of the forward pbar-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 pbar-p and pbar-n scattering and the deuteron form factor. A formalism allowing to take into account Coulomb-nuclear interference effects in polarized pbar-d cross sections is developed. Numerical calculations for the polarized total pbar-d cross sections are performed at beam energies 20-300 MeV using the Nbar-N interaction models developed by the Julich 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 pbar-d cross sections are in good agreement with the performed Glauber calculations. It is found that for the used Nbar-N models the total longitudinal and transversal pbar-d cross sections are comparable in absolute value to those for pbar-p scattering.