The role of the final-state N N -rescattering (N N -FSI) in the polarization observables of the inclusive reaction d(γ, π − )pp, involving polarization of the photon beam and/or the deuteron target, is investigated. Various single-and double-spin asymmetries are studied with respect to the influence of such interaction effect and numerical predictions are given for forthcoming experiments. It has been found that the effect of N N -FSI is quite important for the single-spin asymmetries Σ, T 20 , T 21 and T 22 and the double-spin asymmetry T ℓ 20 , whereas it is much less important for the vector target asymmetry T 11 and other beam-target double-polarization asymmetries. Furthermore, we found that the inclusion of the N N -FSI improves the description of the LEGS data for the linear photon asymmetry.
The photoproduction of K 0 on the deuteron has been investigated with the inclusion of the Y N and KN final-state interaction (FSI), as well as the pion-mediated process γ d → πNN → KY N. The Y N rescattering effects for the inclusive cross section are found to be large in the threshold regions. Polarization observables show sizable FSI effects at larger kaon and hyperon angles. It is shown that the extraction of the elementary γ N → KY amplitude is possible in the quasifree scattering region where FSI effects are negligible. Furthermore, the cross sections in this region are large, indicating that measurements in this kinematic region are favored.
Kaon photoproduction on the deuteron is studied with respect to a specific two-body contribution, namely a pion mediated production process, besides other final state interaction contributions from kaon-nucleon and hyperon-nucleon scattering. In this process, a pion is first photoproduced on one nucleon and then interacts with the spectator nucleon in a strangeness exchange reaction leading to a kaon and a hyperon. A sizeable effect from this pion mediated contribution is found, considerably larger than the previously studied hyperon-nucleon rescattering, whereas kaon-nucleon rescattering is much less important. Besides total and semi-inclusive differential cross sections, tensor target asymmetries are studied with respect to the influence of such interaction effects.
The characteristics of the associated particles produced in 3.7 and 200A GeV 32 S -emulsion inelastic interactions are reported. The experimental data at 3.7 A GeV are compared with the predictions of the standard cascading evaporation model. For explaining the results at higher energy (200A GeV), a simple model which includes the nucleon sub-structure (Reggeon model) is introduced. This model is found to be capable of producing the mean features of the data obtained for the two used exposures.
Neutral kaon photoproduction on the deuteron has been investigated by including the final state effects and compared with the experimental data. Comparison shows that the models used in this calculation can reproduce the data in the Σ channel regions fairly well but still give over predictions in the Λ channel. It seems that the tensor target asymmetries are more suitable for studying the final state effects. The extractions of the elementary photoproduction amplitude are also demonstrated.
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