Abstract
Incoherent pion photoproduction on the deuteron γd→πNN is investigated in the energy region Eγthr≤Eγ≤ 160 MeV. The model applied contains the amplitudes of the impulse approximation as well as the NN and πN rescattering in the final state. For the elementary γN→πN amplitude, the unitary isobar MAID-2007 model is used. This model is parameterized in terms of invariant amplitudes and allows one to give a more reliable description of the threshold region. The half-off-shell NN and πN scattering amplitudes are obtained from separable representations of realistic NN and πN interactions, respectively. For the first time, numerical results for the linear photon asymmetry Σ, vector T11 and tensor T2M (M=0,1,2) deuteron spin asymmetries for the reactions γd→π−pp, γd→π+nn, and γd→π0np are presented. In addition, results for the unpolarized differential and total cross sections are given. We found that the influence of NN rescattering is moderate in both charged-and neutral-pion production channels, whereas πN rescattering is almost negligible in the charged-pion production channels which is not the case in neutral-pion production since a noticeable contribution is obtained. The calculated results for unpolarized differential and total cross sections are compared with the available experimental data and other theoretical models, and a satisfactory agreement is obtained.
•Incoherent pion photoproduction on the deuteron near threshold is investigated including rescattering effects.•For the first time, polarization observables are predicted near threshold.•The influence of NN-FSI effect is moderate in the π0-production.•πN-rescattering has a noticeable contribution only in the π0-production.•The unpolarized cross sections have a satisfactory agreement with experiment and other theories.