Vector meson form factors on the lattice

We compute form factors of vector mesons in lattice QCD. We use the QCDSF gauge field configurations with two dynamical flavors of non-perturbatively improved Wilson fermions. In contrast to, e.g., the physical rho-meson, the vector mesons are stable on the lattice in the parameter ranges (pion masses and volumes) we consider. Nevertheless, the results are examplary for form factors of spin-1 particles, and can be compared to results for pion and nucleon form factors. We present results for the electromagnetic form factors that allow to derive the charge radius and the g-factor of the rho meson, and also the quadrupole moment, which describes deviations from the spherical shape of the meson. We also present first results for axial vector form factors.