Data-driven QCD background estimation to W production in association with jets using the ATLAS detector

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dc.contributor.advisorHamilton, Andrewen_ZA
dc.contributor.authorRadovanovic, Lidijaen_ZA
dc.date.accessioned2017-01-26T14:00:19Z
dc.date.available2017-01-26T14:00:19Z
dc.date.issued2016en_ZA
dc.description.abstractA preliminary analysis was conducted using data from the proton-proton collisions at p s = 8 TeV recorded by the ATLAS experiment, corresponding to an integrated luminosity of approximately 18.9 ƒƅ⁻¹. It has been performed to extract the fraction of QCD events in the chosen phase space for the W boson production in association with jets. A data-driven technique was developed for measuring the QCD background. The fraction of QCD events in the signal region was estimated in exclusive jet multiplicities by performing an extended likelihood fit on the Emiss T distribution in data. The fraction of QCD events ranges 2:9 ± 0:01% for the zero jet bin and increases to 10:74 ± 0:11% for the two jet bin.The fraction of QCD events decreases with increasing jet multiplicity. Using the results from the fit, some important kinematic distributions have been made. The overall agreement between the data and Monte Carlo simulation is vastly improved by including the data-driven QCD background estimate. This agreement could be further improved by using a data-driven tt estimate where the tt MC tends to overestimate the amount of events in the higher jet multiplicities.en_ZA
dc.identifier.apacitationRadovanovic, L. (2016). <i>Data-driven QCD background estimation to W production in association with jets using the ATLAS detector</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/23466en_ZA
dc.identifier.chicagocitationRadovanovic, Lidija. <i>"Data-driven QCD background estimation to W production in association with jets using the ATLAS detector."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 2016. http://hdl.handle.net/11427/23466en_ZA
dc.identifier.citationRadovanovic, L. 2016. Data-driven QCD background estimation to W production in association with jets using the ATLAS detector. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Radovanovic, Lidija AB - A preliminary analysis was conducted using data from the proton-proton collisions at p s = 8 TeV recorded by the ATLAS experiment, corresponding to an integrated luminosity of approximately 18.9 ƒƅ⁻¹. It has been performed to extract the fraction of QCD events in the chosen phase space for the W boson production in association with jets. A data-driven technique was developed for measuring the QCD background. The fraction of QCD events in the signal region was estimated in exclusive jet multiplicities by performing an extended likelihood fit on the Emiss T distribution in data. The fraction of QCD events ranges 2:9 ± 0:01% for the zero jet bin and increases to 10:74 ± 0:11% for the two jet bin.The fraction of QCD events decreases with increasing jet multiplicity. Using the results from the fit, some important kinematic distributions have been made. The overall agreement between the data and Monte Carlo simulation is vastly improved by including the data-driven QCD background estimate. This agreement could be further improved by using a data-driven tt estimate where the tt MC tends to overestimate the amount of events in the higher jet multiplicities. DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Data-driven QCD background estimation to W production in association with jets using the ATLAS detector TI - Data-driven QCD background estimation to W production in association with jets using the ATLAS detector UR - http://hdl.handle.net/11427/23466 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/23466
dc.identifier.vancouvercitationRadovanovic L. Data-driven QCD background estimation to W production in association with jets using the ATLAS detector. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/23466en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherPhysicsen_ZA
dc.titleData-driven QCD background estimation to W production in association with jets using the ATLAS detectoren_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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