Influence of NN-rescattering effect on the photon asymmetry of d(γ→,π−)pp reaction

The influence of final-state NN-rescattering on the beam asymmetry Σ for linearly polarized photons in π− photoproduction on the deuteron in the energy range from π-threshold through the Δ(1232)-resonance has been investigated. Numerical results for this spin observable are predicted and compared with recent experimental data from the LEGS Spin Collaboration. Final-state NN-rescattering is found to be quite important and leads to a better agreement with existing experimental data. Furthermore, the differences with other theoretical models have been discussed.