The $η$NN Coupling in Eta Photoproduction

Details The $η$NN Coupling in Eta Photoproduction The $η$NN Coupling in Eta Photoproduction

1994-04-12

arxiv.org/abs/nucl-th/9404013v1

Nucl.Phys. A580 (1994) 455-474

Physics

Nuclear Physics

Nuclear Theory

25 pages, 9 figures (available from the authors), Mainz preprint MKPH-T-94-3

Scientific paper

10.1016/0375-9474(94)90909-1

Low-energy eta photoproduction on the nucleon is studied in an effective Lagrangian approach that contains Born terms, vector meson and nucleon resonance contributions. The resonance sector includes the $S_{11}(1535)$, $P_{11}(1440)$ and $D_{13}(1520)$ states whose couplings are fixed by independent electromagnetic and hadronic data. The available $(\gamma,\eta)$ data are employed to discuss the difference between pseudoscalar and pseudovector Born terms and to determine the magnitude of the $\eta NN$ coupling constant. We present multipoles that are most sensitive to the various model ingredients and demonstrate how these multipoles may be accessed in polarization observables. Cross section calculations are presented for eta photoproduction on light nuclei.

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