Vector-meson - nucleon couplings at spacelike momentum transfer

Abstract

We have analyzed the presently available experimental data on the electromagnetic form factors for the nucleon to obtain information on the vector-meson-nucleon couplings. We obtained a strong momentum dependence of both vector and tensor couplings at spacelike momentum transfers. In addition a strong momentum dependence is found for the ratio of tensor/vector couplings. This indicates a small tensor coupling at $t=0$, despite a large value at $t={m}_{V}^{2}$. The results depend critically on the measured ratio of Pauli/Dirac em-proton form factors. So further measurements on all $t$ would be of great interest concerning our understanding of the nucleon structure.