Vertex form factors of the rho-meson nucleon interaction at low momentum transfer

We calculated the one pion loop contributions to the form factors of the rho-nucleon interaction within a field theoretical model using effective Lagrangians. The results show that the tensor interaction is likely to be described well within such an approach. We obtain a magnetic coupling in the range of 3.5-7.1 at Q2=0, depending on the choice of pion-nucleon form factor and a dipole form for the Q2 dependence tensor form factor with a scale of roughly 900 MeV for space-like momentum transfer. The results agree with the findings of the recent analysis of the p-N interaction and support a small scale parameter (Λ∝0.5 GeV) for the pion-nucleon form factor. (orig.)