Abstract
We investigate coherent pi(0)-photoproduction on the deuteron near threshold with special emphasis on beam-target double spin asymmetries. We present results for the spin asymmetries T-1M(c) (M=0, 1) for circular polarized photons and vector polarized deuterons, T-2M(c) (M=1, 2) for circular polarized photons and tensor polarized deuterons, T-1M(l) (M=0, +/- 1) for longitudinal polarized photons and vector polarized deuterons, and T-2M(l) (M=0, +/- 1, +/- 2) for longitudinal polarized photons and tensor polarized deuterons in the gamma d ->pi(0)d reaction near threshold. We also discuss the sensitivity of the estimated results to the D-wave component of the deuteron wave function. The unitary isobar MAID-2007 model is used for the elementary gamma N ->pi N amplitude. This model is parameterized in terms of invariant amplitudes and allows one to give a more reliable description of the threshold region. The realistic and high-precision BonnNNpotential (full model) is used for the deuteron wave function. We have found that theD-wave component of the deuteron wave function has a little effect on the T-1M(c) (M=0, 1) and T-2M(l) (M=0, 1, 2) spin asymmetries. On the contrary, we have obtained a significant role of the D-wave component on the spin asymmetries T-2M(c) (M=1, 2), T-1M(l) (M=0, +/- 1), and T-2M(l) (M=- 1,- 2).