Beam-target double spin asymmetries in the reaction [formula omitted] near threshold with final-state rescattering effects

Abstract

Near-threshold incoherent pion photoproduction on the deuteron including final-state rescattering effects is investigated with special emphasize on the beam-target double spin asymmetries. The elementary γN→πN amplitude is taken from the unitary isobar MAID-2007 model which describes well the threshold region. We present the first results on all possible double spin asymmetries of the differential and total cross sections for both the charged- and neutral-pion production channels near threshold. We discuss the sensitivity of the estimated results to the NN and πN final-state rescattering effects. It turns out that the role of NN-rescattering is significant, and its inclusion strongly affected the results for double spin asymmetries in the charged- and neutral-pion channels. We also find that the πN-rescattering effect is insignificant in the case of charged-pion channels, whereas it has a noticeable contribution on most of double spin asymmetries in the neutral-pion channel.