Antideuteron Limits on Decaying Dark Matter with a Tuned Formation Model
  We investigate the production of antideuterons from decaying dark matter,
using gravitinos in supersymmetric models with trilinear R-parity violating
(RPV) operators as an example. The model used for antideuteron formation is
shown to induce large uncertainties in the predicted flux, comparable to
uncertainties from cosmic-ray propagation models. We improve on the formation
model by tuning hadronization and coalesence parameters in Monte Carlo
simulations to better reproduce the hadron spectra relevant for antideuteron
production. In light of current bounds on fluxes and future prospects from the
AMS-II and GAPS experiments we set limits on RPV couplings as a function of the
gravitino mass.
