Characterising the decays of high-pt top quarks and addressing naturalness with jet substructure in ATLAS runs I and II

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dc.contributor.author LeBlanc, Matthew Edgar
dc.date.accessioned 2017-05-11T22:02:24Z
dc.date.available 2017-05-11T22:02:24Z
dc.date.copyright 2017 en_US
dc.date.issued 2017-05-11
dc.identifier.uri http://hdl.handle.net/1828/8102
dc.description.abstract The coupling of the Standard Model top quark to the Higgs boson is O(1), which leads to large quantum corrections in the perturbative expansion of the Higgs boson mass. Possible solutions to this so-called naturalness problem include supersymmetric models with gluinos and stop squarks whose masses are at the electroweak scale, O(1 TeV). If supersymmetry is realised in nature at this scale, these particles are expected to be accessible with the Large Hadron Collider at CERN. A search for gluino pair production with decays mediated by stop- and sbottom-squark loops in the initial 14.8 ifb of the ATLAS run 2 dataset is presented in terms of a pair of simplified models, which targets extreme regions of phase space using jet substructure techniques. No excess is observed and limits are set which greatly extend the previous exclusion region of this search, up to 1.9 TeV (1.95 TeV) for gluinos decaying through light stop (sbottom) squarks to the lightest neutralinos. A performance study of top tagging algorithms in the 20.3 ifb 2012 dataset is also presented, which includes the first measurements of substructure-based top tagging efficiencies and fake rates published by ATLAS, as well as a detailed comparison of tagger performance in simulation. A benchmarking study which compares commercially available cloud computing platforms for applications in High Energy Physics, and a summary of ATLAS liquid argon calorimeter data quality work focused on monitoring and characterising the sporadic phenomena of Mini Noise-Bursts in the electromagnetic barrel calorimeter are also included. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ *
dc.subject HEP en_US
dc.subject Jets en_US
dc.subject JetEtMiss en_US
dc.subject LHC en_US
dc.subject ATLAS en_US
dc.subject CERN en_US
dc.subject SUSY en_US
dc.subject Run2 en_US
dc.subject Run1 en_US
dc.subject Physics en_US
dc.subject High Energy Physics en_US
dc.subject Supersymmetry en_US
dc.subject Jet Substructure en_US
dc.subject JSS en_US
dc.subject Substructure en_US
dc.subject Top Tagging en_US
dc.subject Top Quark en_US
dc.title Characterising the decays of high-pt top quarks and addressing naturalness with jet substructure in ATLAS runs I and II en_US
dc.type Thesis en_US
dc.contributor.supervisor McPherson, Robert
dc.degree.department Department of Physics and Astronomy en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.description.scholarlevel Graduate en_US
dc.description.proquestcode 0798 en_US

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