Massive c anti cg-calculation in diffractive DIS and diffractive D*-production at HERA

We calculate the cross section for c anti cg-production in diffractive DIS with finite quark masses at zero momentum transfer t. The calculation is done in the leading log(1/xP) approximation and is valid in the region of high diffractive masses M (small β). We apply our cross section formula including both c anti c- and c anti cg in a Monte Carlo simulation to diffractive D*± meson production at HERA. We compare our predictions to results of H1 using three parameterizations for the unintegrated gluon density. (orig.)