Abstract
The helicity dependence of the inclusive π
− photoproduction reaction from the deuteron in the Δ(1232)-resonance region is investigated with inclusion of final-state nucleon-nucleon rescattering (NN-FSI). For the elementary π-production operator an effective Lagrangian model which includes the standard pseudovector Born terms and a contribution from the Δ-resonance is used. The half-off-shell NN-scattering matrix is obtained from a separable representation of a realistic NN-interaction. The differential polarized cross-section difference for parallel and antiparallel helicity states is predicted and compared with experiment. We find that the effect of NN-FSI is much less important in the helicity difference than in the previously studied unpolarized differential cross section. Furthermore, the contribution of to the deuteron spin asymmetry is explicitly evaluated with inclusion of NN-FSI. It has been found that the effect of NN-FSI is much larger in the asymmetry than in the total cross section, and this leads to an appreciable reduction of the spin asymmetry in the Δ-region. Inclusion of such effect also leads to improved and quite satisfactory agreement with existing experimental data.