Eta-N Final State Interaction in incoherent Photoproduction of Eta-mesons from the Deuteron near Threshold
A. Sibirtsev, S. Schneider, Ch. Elster, J. Haidenbauer, S. Krewald, J. Speth
Abstract
An analysis of incoherent photoproduction of η mesons off the deuteron for photon energies from threshold to 800 MeV is presented. The dominant contribution, the γN-ηN amplitude, is described within an isobar model. Effects of the final state interactions in the NN as well as the ηN systems are included employing models derived within the meson-exchange approach. It is found that their consideration is important. Specifically, due to an interference effect the influence of the ηN final state interaction is enhanced in the reaction γd np η close to threshold.
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