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We determine the prospects for finding dark matter at the Tevatron and LHCthrough the production of exotic 4th generation quarks T' that decay through T'\to t X, where X is dark matter. The resulting signal of t \bar{t} + \met hasnot previously been considered in searches for 4th generation quarks, but thereare both general and specific dark matter motivations for this signal, and withslight modifications, this analysis applies to any scenario where invisibleparticles are produced in association with top quarks. Current direct andindirect bounds on such exotic quarks restrict their masses to be between 300and 600 GeV, and the dark matter's mass may be anywhere below m_T'. We simulatethe signal and main backgrounds with MadGraph/MadEvent-Pythia-PGS4. For theTevatron, we find that an integrated luminosity of 20 fb^-1 will allow 3\sigmadiscovery up to m_T' = 400 GeV and 95% exclusion up to m_T' = 455 GeV. For the10 TeV LHC with 300 pb^-1, the discovery and exclusion sensitivities rise to490 GeV and 600 GeV. These scenarios are therefore among the most promising fordark matter at colliders. Perhaps most interestingly, we find that dark mattermodels that can explain results from the DAMA, CDMS and CoGeNT Collaborationscan be tested with high statistical significance using data already collectedat the Tevatron and have extraordinarily promising implications for early runsof the LHC.

Dark Matter-Motivated Searches for Exotic 4th Generation Quarks in Tevatron and Early LHC Data