The ρ-meson electromagnetic form factors within the light-front quark model

In this paper, we study the ρ-meson electromagnetic form factors (EMFFs) within the framework of light-front quark model (LFQM). The physical form factors G_C,M,Q(Q²) of ρ-meson as well as the charged square radius ﹤r²﹥, the magnetic moment μ and the quadrupole moment Q are calculated, which describe the behaviors of EMFFs at zero momentum transfer. Using the type-II replacement, we find that the zero-mode does contribute zero to the matrix element S₀₀⁺. It is found that the “M → M₀” replacement improves angular condition remarkably, which permits different prescriptions of ρ-meson EMFFs give the consistent results. The residue tiny violation of angular condition needs other explanations than the zero-mode contributions. Our results indicate that the relativistic effects or interaction internal structure are weaken in the zero-binding limit. This work is also applied for the other spin-1 particles.