This thesis describes the search for Dark Matter at the LHC in the
mono-jet plus missing transverse momentum final state, using the
full dataset recorded in 2012 by the ATLAS Experiment. It is the
first time that the number of jets is not explicitly restricted to
one or two, thus increasing the sensitivity to new signals.
Instead, a balance between the most energetic jet and the missing
transverse momentum is required, thus selecting mono-jet-like final
states. Collider searches for Dark Matter have typically used
signal models employing effective field theories (EFTs), even when
comparing to results from direct and indirect detection
experiments, where the difference in energy scale renders many such
comparisons invalid. The thesis features the first robust and
comprehensive treatment of the validity of EFTs in collider
searches, and provides a means by which the different
classifications of Dark Matter experiments can be compared on a
sound and fair basis.
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