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Data-driven QCD background estimation to W production in association with jets using the ATLAS detector
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 bos...
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| Format: | Thesis |
| Language: | English |
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Department of Physics
2017
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| _version_ | 1867613235398574081 |
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| access_status_str | Open Access |
| author | Radovanovic, Lidija |
| author2 | Hamilton, Andrew |
| author_browse | Hamilton, Andrew Radovanovic, Lidija |
| author_facet | Hamilton, Andrew Radovanovic, Lidija |
| author_sort | Radovanovic, Lidija |
| collection | Thesis |
| description | 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. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/23466 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:54.720Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Physics |
| publisherStr | Department of Physics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/23466 Data-driven QCD background estimation to W production in association with jets using the ATLAS detector Radovanovic, Lidija Hamilton, Andrew Physics 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. 2017-01-26T14:00:19Z 2017-01-26T14:00:19Z 2016 Master Thesis Masters MSc http://hdl.handle.net/11427/23466 eng application/pdf Department of Physics Faculty of Science University of Cape Town |
| spellingShingle | Physics Radovanovic, Lidija Data-driven QCD background estimation to W production in association with jets using the ATLAS detector |
| thesis_degree_str | Master's |
| title | Data-driven QCD background estimation to W production in association with jets using the ATLAS detector |
| title_full | Data-driven QCD background estimation to W production in association with jets using the ATLAS detector |
| title_fullStr | Data-driven QCD background estimation to W production in association with jets using the ATLAS detector |
| title_full_unstemmed | Data-driven QCD background estimation to W production in association with jets using the ATLAS detector |
| title_short | Data-driven QCD background estimation to W production in association with jets using the ATLAS detector |
| title_sort | data driven qcd background estimation to w production in association with jets using the atlas detector |
| topic | Physics |
| url | http://hdl.handle.net/11427/23466 |
| work_keys_str_mv | AT radovanoviclidija datadrivenqcdbackgroundestimationtowproductioninassociationwithjetsusingtheatlasdetector |