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We present the results of a search for dark matter production in the monojetsignature. We analyze a sample of Tevatron pp-bar collisions at sqrt(s)=1.96TeV corresponding to an integrated luminosity of 6.7/fb recorded by the CDF IIdetector. In events with large missing transverse energy and one energetic jet,we find good agreement between the standard model prediction and the observeddata. We set 90% confidence level upper limits on the dark matter productionrate. The limits are translated into bounds on nucleon-dark matter scatteringrates which are competitive with current direct detection bounds onspin-independent interaction below a dark matter candidate mass of 5 GeV/c^2,and on spin-dependent interactions up to masses of 200 GeV/c^2.

A search for dark matter in events with one jet and missing transverse energy in pp-bar collisions at sqrt(s) = 1.96 TeV