  We derive limits on the interactions of dark matter with quarks from ATLAS
null searches for jets + missing energy based on ~1 fb^-1 of integrated
luminosity, using a model-insensitive effective theory framework. We find that
the new limits from the LHC significantly extend limits previously derived from
CDF data at the Tevatron. Translated into the parameter space of direct
searches, these limits are particularly effective for ~GeV mass WIMPs. Our
limits indicate tension with isospin violating models satisfying minimal flavor
violation which attempt to reconcile the purported CoGeNT excess with
Xenon-100, indicating that either a light mediator or nontrivial flavor
structure for the dark sector is necessary for a viable reconciliation of
CoGeNT with Xenon.
