Searching for Dark Matter with the ATLAS Detector
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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2 The ATLAS Experiment
3 ATLAS Reconstruction and Performance
4 Jet Reconstruction and Performance
5 Jet Uncertainties
6 The MonoJet Analysis
7 Monojet Dark Matter Interpretation
8 Monojet Prospects at an Upgraded LHC
Appendix A Effective Field Theory Validity
Appendix B MonoJet Dark Matter Interpretation Signal Sample Details
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8TeV AFII anti-kt ATLAS Collaboration ATLAS detector ATLAS experiment background boson calibration calorimeter cells collisions control region correlation coupling cross-section dark matter dark sector data and MC dataset di-jet diboson distributions DM mass DM particles EFT operators electromagnetic electron EM+JES EmissT threshold endcap energy scale fermionic fraction GEANT4 gluon hep-ex Higgs boson inner detector interaction JES uncertainty jet energy jet multiplicity jet Tp jet2 kinematic LC topo-clusters leading jet lepton limits luminosity masked module mediator mass Mmed mono-jet analysis muon neutrino observed parameter space parton photon Phys pileup procedure pseudorapidity punch-through quarks reconstructed relevant samples scale factor scenarios Sect selection shown signal region simplified model simulation suppression systematic uncertainties tanti-k TeV s Data tkAnti topology Total uncertainty track trigger typically validity veto WIMP Z boson Z+jet μμ μν νν