a Dispersive Model for Triple Meson Vertex Functions

We used a dispersion relation to calculate triple meson vertex functions in the t-channel from microscopically calculated vertex functions in the s-channel. These vertex functions were used to calculate the S-wave intensities for the reaction π^-p → π⁰π⁰n. Special interest was put on the t-dependence of these data as measured by the E852 and the GAMS collaboration, with their peculiar behaviour in the region of the f₀(980) resonance.