The NN final-state interaction in the helicity structure of reaction

✍ Scribed by Eed M. Darwish

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 198 KB
• Volume: 748
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2004.12.039

✦ Synopsis

The influence of final-state NN-rescattering on the helicity structure of the γ d → π -pp reaction in the energy range from π-threshold up to 550 MeV has been investigated. The differential polarized cross-section difference for the parallel and antiparallel helicity states is predicted and compared with recent experimental data. It is shown that the effect of NN-rescattering is much less important in the polarized differential cross-section difference than in the previously studied unpolarized differential cross section. Furthermore, the contribution of γ d → π -pp to the spin asymmetry of the deuteron is explicitly evaluated over the region of the ∆(1232)-resonance with inclusion of NN-rescattering. The effect of NN final-state interaction is found to be much larger in the asymmetry than in the total cross section and leads to an appreciable reduction of the spin asymmetry in the ∆-region.