Single-spin asymmetries of $d(\gamma ,\pi )NN$ in the first resonance region

Abstract

Incoherent photoproduction of pions on the deuteron in the first resonance region is investigated with special emphasis on single-spin asymmetries. For the elementary pion production operator an effective Lagrangian model which includes the standard pseudovector Born terms and a resonance contribution from the $\Delta$(1232)-excitation is used. Single-spin asymmetries, both for charged and neutral pion photoproduction on the deuteron, are analyzed and calculated for the first time in the first resonance region. The linear photon asymmetry $\Sigma$, vector target asymmetry $T_{11}$ and tensor target asymmetries $T_{20}$, $T_{21}$, and $T_{22}$ for the reaction $d(\gamma ,\pi )NN$ are predicted for forthcoming experiments.

Comments: 20 pages including 5 postscript figures, minor revisions in the text added, no changes in the results and in the conclusions