Combined description ofN¯Nscattering and annihilation with a hadronic model

A model for the nucleon-antinucleon interaction is presented which is based on meson-baryon dynamics. The elastic part is the G-parity transform of the Bonn NN potential. Annihilation into two mesons is described in terms of microscopic baryon-exchange processes including all possible combinations of π,η,ρ,ω,${\mathit{a}}_0$,${\mathit{f}}_0$,${\mathit{a}}_1$,${\mathit{f}}_1$,${\mathit{a}}_2$,${\mathit{f}}_2$,K,${\mathit{K}}^{\mathrm{*}}$. The remaining annihilation part is taken into account by a phenomenological energy- and state-independent optical potential of Gaussian form. The model enables a simultaneous description of nucleon-antinucleon scattering and annihilation phenomena with fair quality.