Inclusive photoproduction of η mesons on nuclei and the in-medium properties of theS11resonance

Abstract

A relativistic non-local model for the inclusive photoproduction of η mesons from complex nuclei is introduced. The model is based on the dominance of the S 11 (1535) resonance. We compare the results of our calculations with the available data on inclusive cross sections for the nuclei C, Al and Cu. Assuming the resonance propagates freely in the nuclear medium, we find that the calculated angular distribution and energy dependence of the cross sections reproduce the data in a reasonable fashion. The present non-local model allows the inclusion of density dependent mass and width in the calculations. Including these in the calculations reveals that the presently available data do not show clear preference for the inclusion of such modifications of the properties of the S 11 (1535) in the nuclear medium.

Hadron interferences in the proton-induced coherentη-meson-production reaction on a scalar-isovector nucleus

“…Therefore, the η meson production in the nuclear reaction is considered as a potential tool to investigate the dynamics of N(1535) in the nucleus. Of course, this reaction can also be used to study the η meson nucleus interaction in the final state [11,12]. The η meson can be produced through the hadronic interaction by scattering off the pion or proton on the proton or nuclear target.…”

$π^0$ and $η$ meson exchange interactions in the coherent $η$ meson production in the nucleus

“…Specifically, the η meson strongly couples only to N * (1535), a I(J P ) = 1 2 ( 1 2 + ) nucleonic resonance. Therefore, the η meson production in the nuclear reaction is a potential tool to investigate the propagation of the N * (1535) resonance in the nucleus, in addition to the study of the η meson nucleus interaction in the final state [12,13].…”