Abstract
An explicit evaluation of the deuteron spin asymmetry and the associated Gerasimov-Drell-Hearn (GDH) integral for coherent and incoherent pi-photoproduction channels with inclusion of rescattering effects is presented. The helicity-dependent total inclusive photoabsorption cross section on the deuteron and the helicity-dependent semi-exclusive channels gamma d -> pi(NN)-N-+/- and gamma d -> pi X-0 (X = pn or d) are explicitly evaluated up to 1.5 GeV. Our model calculations indicate that convergence of the GDH integral is reached for pi(0)-production, while it is not completely reached for pi(+/-)-production. For the sum of gamma d -> pi NN and gamma d -> pi(0)d contributions to the finite GDH integral by explicit integration up to 1.5 GeV, a value of 249.73 mu b is obtained. The extracted results are compared with available experimental data from MAMI and ELS Lambda. We find that our predictions fairly well reproduce the data in the pi(NN)-N-+/- case, while fail to predict the measured shape of the pi X-0 channel.