Non-locality and Medium Effects in the Exclusive Photoproduction of Eta Mesons on Nuclei

Abstract

A relativistic model for the quasifree exclusive photoproduction of $\eta$ mesons on nuclei is extended to include both non-local and medium effects. The reaction is assumed to proceed via the dominant contribution of the S${}_{11}$(1535) resonance. The complicated integrals resulting from the non-locality are simplified using a modified version of a method given by Cooper and Maxwell. The non-locality effects are found to affect the magnitude of the cross section. Some possibilities reflecting the effects of the medium on the propagation and properties of the intermediate S${}_{11}$ resonance are studied. The effects of allowing the S${}_{11}$ to interact with the medium via mean field scalar and vector potentials are considered. Both broadening of width and reduction in mass of the resonance lead to a suppression of the calculated cross sections.

arXiv comment19 pages, 7 figures

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Cited by in corpus (2)

• Inclusive Photoproduction of $\eta$ Mesons on Nuclei and the in-medium properties of the S${}_{11}$ Resonance
• Hadron interferences in the proton induced coherent $\eta$ meson production reaction on a scalar-isovector nucleus