title: Detector Corrected Search for Dark Matter in Monojet and Vector Boson Fusion Topologies with the ATLAS Detector
creator: Spieker, Thomas Malte
subject: ddc-530
subject: 530 Physics
description: A detector-corrected dark matter search is presented using 36.2 fb⁻¹ of proton-proton collisions at √s = 13 TeV, delivered by the Large Hadron Collider and recorded by the ATLAS detector. The search targets dark matter production in association with at least one jet as well as dark matter produced in a vector boson fusion topology. The ratio of cross sections between the signal region and two combined control regions is measured differentially as a function of four observables. The control regions target the leptonic decay of Z bosons, in similar topologies like the expected dark matter signal. The data is corrected for detector effects via an unfolding technique to facilitate the comparison to new physics models without the need for a detector simulation. Unfolding strategies with and without background subtraction are investigated, where the latter has been shown to introduce biases on the results. The former strategy is consequently used and the data is found to be in agreement with its predictions. Exclusion limits at 95% confidence level are derived on a simplified dark matter model and the invisible branching fraction of the Standard Model Higgs boson.
date: 2019
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/26823/1/PhDThesis_ThomasSpieker_HGSFP.pdf
identifier: DOI:10.11588/heidok.00026823
identifier: urn:nbn:de:bsz:16-heidok-268235
identifier:   Spieker, Thomas Malte  (2019) Detector Corrected Search for Dark Matter in Monojet and Vector Boson Fusion Topologies with the ATLAS Detector.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/26823/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng