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Within the kt-factorization approach, we evaluate the impact factor of thetransition gamma* -> rhoT taking into account the twist 3 contributions. Weshow that a gauge invariant expression is obtained with the help of QCDequations of motion. More generally, relying on these equations and on theinvariance under rotation on the light-cone of the factorized amplitude, thenon-perturbative Distribution Amplitudes can be reduced to a minimal set. Thisopens the way to a consistent treatment of factorization for exclusiveprocesses with a transversally polarized vector meson. We prove the equivalenceof two proposed parametrizations of the rhoT distribution amplitudes.

Hard diffractive processes and non-perturbative matrix elements beyond leading twist: rhoT-meson production