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Multijet Background Estimation for Supersymmetry Searches and Radiation Damage Studies with the ATLAS Detector

Moss, Harry (2018) Multijet Background Estimation for Supersymmetry Searches and Radiation Damage Studies with the ATLAS Detector. PhD thesis, University of Sheffield.

Available under License Creative Commons Attribution-Noncommercial-No Derivative Works 2.0 UK: England & Wales.

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This thesis documents a data-driven methodology for the estimation of the multijet background in fully hadronic final states with high missing transverse momentum within the ATLAS detector at the Large Hadron Collider. The implementation of this methodology within two analyses searching for evidence of supersymmetric particle production using 36.1 fb−1 of √s = 13 TeV proton-proton collision data is described. The two analyses described in this thesis investigate supersymmetric particle production via the strong interaction both inclusively via the superpartners of the first and second generation quarks and exclusively via the superpartners of the third generation t and b quarks. Both analyses consider the eventual decay of any produced supersymmetric particles to standard model particles and the lightest neutralino, which escapes without detection and is observed as missing momentum in the transverse plane of the detector. Additionally, an investigation into the level of radiation damage received by the ATLAS silicon Semiconductor Tracker is presented with predictions of the level of radiation damage faced over the course of the planned lifetime of the detector.

Item Type: Thesis (PhD)
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Physics and Astronomy (Sheffield)
Identification Number/EthosID: uk.bl.ethos.762586
Depositing User: Mr Harry Moss
Date Deposited: 14 Jan 2019 09:46
Last Modified: 25 Sep 2019 20:05
URI: http://etheses.whiterose.ac.uk/id/eprint/22597

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