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In order to prevent events originating from a process similar to Drell-Yan, a z-veto was added to the selection criteria by restricting events to having a combined invariant momentum that does not fall within 15 GeV of the mass of the Z-boson (approx 91 GeV).   Background processes were simulated using the MadGraph5 v1.5.11 [30 in claudio]. Initial state samples of the target process were generated in Pythia 6 assuming a mass for the supesymmetric top at 50 GeV intervals between 200 and 800 GeV. These samples were then decayed to their final state using the same version of MadGraph5. For a description of the various background estimations, see section \ref{sect:background}.