Production of heavy meson pairs in pbar{p} collisions within a double handbag approach

We study the pair-production of heavy mesons in proton-antiproton annihilations within a perturbative QCD-motivated framework. In particular we investigate $p \bar{p} \rightarrow \overline{D^0} D^0$ within a double handbag approach, where a hard subprocess factorizes from soft hadronic matrix elements. The soft matrix elements can be parametrized by transition distribution amplitudes, which are off-diagonal in flavor space. The transition distribution amplitudes are modelled as overlaps of light-cone wave functions. We obtain rather robust model results for $p \bar{p} \rightarrow \overline{D^0} D^0$ cross sections, which are expected to be measured at the future $\bar{\text{P}}\text{ANDA}$ detector at GSI-FAIR.