Search

This work has been partially supported by STFC grant ST/L000385/1. We thank the Cambridge SUSY Working Group and T. Stefaniak for stimulating discussions. Some of the CPU intensive parts of this work was performed on the Abel Cluster, owned by the University of Oslo and the Norwegian metacenter for High Performance Computing (NOTUR), and operated by the Research Computing Services group at USIT, the University of Oslo IT-department. The computing time was given by NOTUR allocation NN9284K, financed through the Research Council of Norway.

Antideuterons are a potential messenger for dark matter annihilation or decay in our own galaxy, with very low backgrounds expected from astrophysical processes. The standard coalescence model of antideuteron formation, while simple to implement, is shown to be under considerable strain by recent data from the LHC. We suggest a new empirically based model, with only one free parameter, which is better able to cope with these data, and we explore the consequences of the model for dark matter searches., 19 pages, 15 figures, C++ code with parametrised cross sections can be found in the ancillary folder, v2 fixes important missing references

ATLAS recently reported a $3\ensuremath{\sigma}$ excess in a leptonic-$Z+{E}_{T}^{\text{miss}}$ channel. This was interpreted in the literature in a simplified general gauge mediation model containing a gluino, a Higgsino next-to-lightest supersymmetric particle and a gravitino lightest supersymmetric particle. We test the consistency of this explanation in lieu of the results of the corresponding search in CMS, and other LHC searches for new physics. Due to nondecoupling effects from squarks the parameter space of these models is split into two regions; in one region additional leptons via top quark production are expected, while the other region sees a large probability for zero-lepton events. After combining the relevant constraints we find that these models cannot explain the ATLAS excess.