eta-meson photoproduction off protons and deuterons

Details eta-meson photoproduction off protons and deuterons eta-meson photoproduction off protons and deuterons

1997-01-14

arxiv.org/abs/nucl-th/9701022v1

Phys.Lett. B409 (1997) 51-57

Physics

Nuclear Physics

Nuclear Theory

11 pages Latex, 4 Postscript Figures

Scientific paper

10.1016/S0370-2693(97)00886-1

We present a unitary and gauge-invariant model with coupled channels, which provides a consistent description of pion photoproduction off nucleons in the E$_{0+}$ channel and eta-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 S$_{11}$(1535) and S$_{11}$(1650) baryon resonances. Due to the coupling between the channels, the production of eta-mesons is strongly affected by the S$_{11}$(1650) although its direct coupling to the $\eta$N channel is negligible. The rho- and omega-meson exchange terms are important for achieving a consistent description of both pion- and photon-induced reactions.

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