Prospects of Collider Searches for DFSZ Axinos

Prospects for direct collider searches for the QCD axion -- a dark matter candidate that presents a solution to the strong CP problem -- are limited at best. However, in the context of supersymmetry (SUSY), existing collider experiments may be sensitive to the axion's super-partner, the axino. We will discuss a physics model that incorporates both DFSZ axions and axinos, in which the axino is the lightest supersymmetric particle (LSP). Such a model gives rise to processes in which heavier supersymmetric particles may decay to an axino and a Higgs boson, or vector bosons (W/Z). The lifetime of the decay in these cases will be proportional to the axion mass. For a wide range of model parameters ranging from with micro-eV to milli-eV axion masses, we show that the decaying particle is long-lived and gives rise to detector signatures including displaced vertices and missing energy. We will present the prospects for searches for these axion-axino models at detectors such as the ATLAS and CMS experiments at CERN.