Spin asymmetry for the 16O( γ ,πp) reaction in the Δ(1232) regionwithin an effective Lagrangian approach

摘要

The spin asymmetry of the photon in the exclusive A( γ ,πN)A 1 reaction is computed employing arecently developed fully relativistic model based on elementary pion production amplitudes that includea consistent treatment of the spin-3/2 nucleon resonances. We compare the results of this model to theonly available data on Oxygen K. Hicks, et al., Phys. Rev. C 61 (2000) 054609 and find that, contraryto other models, the predicted spin asymmetry compares well to the available experimental data in theΔ(1232) region. Our results indicate that no major medium modifications in the Δ(1232) properties areneeded in order to describe the measured spin asymmetries.