Photoproduction and electroproduction of charm at high energies

We estimate the differential and total cross sections for both the photoproduction of a vector D* mason and its yield in deep inelastic scattering at the DESY HERA collider in the framework of a model motivated by perturbative calculations in QCD. The offered model allows us to take into account higher twists over the transverse momentum of meson at p(T) similar to m(c) and to correctly approach the dominance of c-quark fragmentation at p(T) much greater than m(c) We consider the possibility far the hadronization of a color-octet c (q) over bar state into the meson. The combined contribution by the singlet and octet-color terms results in a good agreement with the experimental data for both the photoproduction and production in deep inelastic scattering.