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We generalize in several directions our recent analysis of the limitations tothe use of the effective field theory approach to study dark matter at the LHC.Firstly, we study the full list of operators connecting fermion DM to quarksand gluons, corresponding to integrating out a heavy mediator in the$s$-channel; secondly, we provide analytical results for the validity of theEFT description for both $\sqrt{s}=8$ {\rm TeV} and $14$ {\rm TeV}; thirdly, wemake use of a MonteCarlo event generator approach to assess the validity of ouranalytical conclusions. We apply our results to revisit the current colliderbounds on the ultraviolet cut-off scale of the effective field theory and showthat these bounds are weakened once the validity conditions of the effectivefield theory are imposed.

On the Validity of the Effective Field Theory for Dark Matter Searches at the LHC, Part II: Complete Analysis for the s-channel