  We review on the calculation of the heavy-quark photo-production vector form
factors, with the full dependence on the mass of the heavy-quark. The Feynman
diagrams are evaluated within the dimensional regularization scheme and
expressed in Laurent series of $\epsilon=(4-D)/2$, where $D$ is the space-time
dimension. The coefficients of the expansion are expressed in terms of harmonic
polylogarithms. The numerical evaluation of the analytical formulas and the
threshold limit of our results are presented.
