η-meson photoproduction off protons and deuterons
Abstract
We present a unitary and gauge-invariant model with coupled channels, which provides a consistent description of pion photoproduction off nucleons in the E0+ channel and η-meson photoproduction off protons and deuterons. An effective field theory with hadrons and photons is constructed, which includes non-resonant Born terms as well as the S11(1535) and S11(1650) baryon resonances. Due to the coupling between the channels, the production of η-mesons is strongly affected by the S11(1650) although its direct coupling to the ηN channel is negligible. The rho- and omega-meson exchange terms are important for achieving a consistent description of both pion- and photon-induced reactions.
- Publication:
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Physics Letters B
- Pub Date:
- February 1997
- DOI:
- 10.1016/S0370-2693(97)00886-1
- arXiv:
- arXiv:nucl-th/9701022
- Bibcode:
- 1997PhLB..409...51D
- Keywords:
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- Nuclear Theory
- E-Print:
- 11 pages Latex, 4 Postscript Figures