NN Final-State Interaction in the Helicity Dependence of Inclusive π^- Photoproduction from the Deuteron(Nuclear Physics)
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概要
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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 d^^→ (γ^^→, π^-)pp 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.
- 理論物理学刊行会の論文
- 2005-01-25