Massive $c\bar cg$-calculation in diffractive DIS and diffractive $D^*$-production at HERA

Abstract.

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