On the electromagnetic form factors of hadrons in the time-like region near threshold

Hadron electromagnetic form factor in the time-like region at the boundary of the physical region is considered. The energy behavior of the form factor is shown to be determined by the strong hadron-antihadron interaction. We propose a simple phenomenological model of the hh-bar interaction that describes the form factor behaviour in the region where scattering length approximation fails and estimate on its basis imaginary part of the scattering lengths (volumes) for ΛΛ-bar, ΛΣ-bar0(Λ-barΣ0), Σ0Σ-bar0 and D*D*-bar from present experimental data. The developed approach enables us to analyze the existence of baryon-antibaryon (BB-bar) near threshold resonances. The experiments to extract detailed information on the near threshold BB-bar interaction from hadron form factor energy behavior are suggested.