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HK: Physik der Hadronen und Kerne
HK 37: Theory V
HK 37.4: Vortrag
Donnerstag, 14. März 2002, 15:00–15:15, A
Contribution of Single Pion Photoproduction to Spin Asymmetry and GDH Sum Rule for the Deuteron — •Eed Darwish1,2, Hartmuth Arenhövel1, and Michael Schwamb1 — 1Institut für Kernphysik, J. Gutenberg-Universität, J.-J. Becher-Weg 45, D-55099 Mainz, Germany — 2Physics Department, Faculty of Science, South Valley University, Sohag, Egypt
The contribution of incoherent single pion photoproduction to the spin asymmetry for the deuteron is evaluated up to 550 MeV photon energy with inclusion of NN and π N rescattering in the final state. For the elementary production operator γ N→ π N, we have taken into account the standard pseudovector Born terms as well as the contribution of the Δ(1232) resonance [1]. For the NN and π N interactions we use the separable representations from Haidenbauer et al. [2] and Nozawa et al. [3], respectively.
The effect of final state rescattering on the spin asymmetry for pion photoproduction on the deuteron is discussed. The corresponding Gerasimov-Drell-Hearn integrals evaluated up to 550 MeV are also presented.
It turns out that the inclusion of final state interaction is important and should be considered in forthcoming theoretical studies.
[1] R. Schmidt et al., Z. Phys., A355 (1996), 421
[2] J. Haidenbauer et al., Phys. Rev., C30 (1984), 1822
[3] S. Nozawa et al., Nucl. Phys., A513 (1990) 459