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Detector corrected cross-sections in topologies sensitive to dark matter production with the ATLAS experiment

Konstantinides, Vasilis; (2021) Detector corrected cross-sections in topologies sensitive to dark matter production with the ATLAS experiment. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

An analysis of events with large missing transverse momentum in association with jets is presented using 139.0 fb−1 of proton-proton collisions at a centre of mass energy of 13 TeV, delivered by the Large Hadron Collider and recorded by the ATLAS detector. The dominant Standard Model process contributing to this signature is the invisible decay of the Z boson as well as the leptonic decay of the W boson where the charged lepton is outside the detector acceptance. The similarities between these processes and the leptonic decays of the Z and W bosons are exploited in dedicated 1-lepton and 2-lepton regions where the in-acceptance leptons are treated as though they were invisible in order to constrain the modelling and minimise the experimental and theoretical uncertainties. The analysis is performed in three jet phase-spaces that are sensitive to different mechanisms of dark matter production; the ≥ 1 jet, ≥ 2 jet and VBF phase-spaces. Fiducial cross-sections are presented single and double differentially as a function of missing transverse momentum and other jet kinematics, in events with zero leptons, one lepton and two leptons and in each of the jet phase-spaces. Ratios of cross-sections are also presented to facilitate comparisons between the regions. The data is corrected for detector effects via the iterative bayesian unfolding technique, making the measurements readily available for comparison to new physics models without the need of a detector simulation.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Detector corrected cross-sections in topologies sensitive to dark matter production with the ATLAS experiment
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10119246
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