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Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC

This thesis presents the search for the supersymmetric partner of the top quark in \sqrt{s} = 13 TeV proton-proton collisions at the LHC using data collected by the ATLAS detector in 2015 and 2016. Results were interpreted considering natural supersymmetric extensions of the Standard Model in R-pari...

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Autor principal: Miano, Fabrizio
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2650559
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author Miano, Fabrizio
author_facet Miano, Fabrizio
author_sort Miano, Fabrizio
collection CERN
description This thesis presents the search for the supersymmetric partner of the top quark in \sqrt{s} = 13 TeV proton-proton collisions at the LHC using data collected by the ATLAS detector in 2015 and 2016. Results were interpreted considering natural supersymmetric extensions of the Standard Model in R-parity conserving decays. Events characterised by four or more jets and missing transverse momentum in the final states were selected. The performance of the tracking algorithms used by the ATLAS online trigger were studied. Optimisation studies of the search regions to increase the sensitivity to supersymmetric signals were performed and data-driven techniques to estimate Standard Model backgrounds were employed. The agreement between data and background predictions was extensively checked and the extrapolations from background-enriched regions to signal-enriched regions were validated. The analysis yielded no significant excess therefore exclusion limits on various models were set.
id cern-2650559
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-26505592019-09-30T06:29:59Zhttp://cds.cern.ch/record/2650559engMiano, FabrizioOptimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHCParticle Physics - ExperimentThis thesis presents the search for the supersymmetric partner of the top quark in \sqrt{s} = 13 TeV proton-proton collisions at the LHC using data collected by the ATLAS detector in 2015 and 2016. Results were interpreted considering natural supersymmetric extensions of the Standard Model in R-parity conserving decays. Events characterised by four or more jets and missing transverse momentum in the final states were selected. The performance of the tracking algorithms used by the ATLAS online trigger were studied. Optimisation studies of the search regions to increase the sensitivity to supersymmetric signals were performed and data-driven techniques to estimate Standard Model backgrounds were employed. The agreement between data and background predictions was extensively checked and the extrapolations from background-enriched regions to signal-enriched regions were validated. The analysis yielded no significant excess therefore exclusion limits on various models were set.CERN-THESIS-2018-277oai:cds.cern.ch:26505592018-12-10T01:35:31Z
spellingShingle Particle Physics - Experiment
Miano, Fabrizio
Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC
title Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC
title_full Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC
title_fullStr Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC
title_full_unstemmed Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC
title_short Optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the ATLAS Detector at the LHC
title_sort optimisation studies and data-driven background estimation in searches for the supersymmetric partner of the top quark with the atlas detector at the lhc
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2650559
work_keys_str_mv AT mianofabrizio optimisationstudiesanddatadrivenbackgroundestimationinsearchesforthesupersymmetricpartnerofthetopquarkwiththeatlasdetectoratthelhc