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The contribution of the light-front valence wave function to theelectromagnetic current of spin-1 composite particles is not enough to warrantythe proper transformation of the current under rotations. The naive derivationof the plus component of the current in the Drell-Yan-West frame within ananalytical and covariant model of the vertex leads to the violation of therotational symmetry. Computing the form-factors in a quasi Drell-Yan-West frame$q^+\rightarrow 0$, we were able to separate out in an analytical form thecontributions from Z-diagrams or zero modes using the instant-form cartesianpolarization basis.

Eletroweak Form Factors in the Light-Front for Spin-1 Particles