Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson

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dc.contributor.advisorHamilton, Andrewen_ZA
dc.contributor.authorMwewa, Chilufyaen_ZA
dc.date.accessioned2014-11-05T03:58:44Z
dc.date.available2014-11-05T03:58:44Z
dc.date.issued2014en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractFollowing the recent discovery of a Standard Model Higgs-like particle at the Large Hadron Collider, this study searches for the evidence of invisible decays of this particle. Assuming that this is the Standard Model Higgs boson, its decay to invisible particles is not expected to be measurable in the current data. However, it could have a large contribution from its decay to stable non-Standard Model particles such as the hypothetical dark matter particles. This study corresponds to 4.7 fb!1 of 7 TeV proton-proton collisions and 20.3 fb!1 of 8 TeV proton-proton collisions. At the time of thesis submission, the 8 TeV results were not unblinded by the ATLAS Collaboration, so toy-data are presented here to demonstrate the procedure. The performance of the statistical framework to be used in the combination of the 7 TeV data with the real 8 TeV data is assessed and is found to perform very well. The results are interpreted to set 95 confidence level limits on the branching ratio to invisible particles of the newly discovered Higgs-like particle at a mass of 125 GeV. Limits are also set on the production cross section ⇥ branching ratio of additional Higgs-like particles that decay invisibly in the mass range: 115 GeV to 300 GeV. In the combination of the 7 TeV data and 8 TeV toy-data, an expected (observed) upper limit of0.89 (0.59) is set on the branching ratio to invisible particles of a 125 GeV Higgs boson. In the mass range 115 to 300 GeV, no excess beyond the Standard Model expectation is observed.en_ZA
dc.identifier.apacitationMwewa, C. (2014). <i>Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/9216en_ZA
dc.identifier.chicagocitationMwewa, Chilufya. <i>"Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 2014. http://hdl.handle.net/11427/9216en_ZA
dc.identifier.citationMwewa, C. 2014. Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mwewa, Chilufya AB - Following the recent discovery of a Standard Model Higgs-like particle at the Large Hadron Collider, this study searches for the evidence of invisible decays of this particle. Assuming that this is the Standard Model Higgs boson, its decay to invisible particles is not expected to be measurable in the current data. However, it could have a large contribution from its decay to stable non-Standard Model particles such as the hypothetical dark matter particles. This study corresponds to 4.7 fb!1 of 7 TeV proton-proton collisions and 20.3 fb!1 of 8 TeV proton-proton collisions. At the time of thesis submission, the 8 TeV results were not unblinded by the ATLAS Collaboration, so toy-data are presented here to demonstrate the procedure. The performance of the statistical framework to be used in the combination of the 7 TeV data with the real 8 TeV data is assessed and is found to perform very well. The results are interpreted to set 95 confidence level limits on the branching ratio to invisible particles of the newly discovered Higgs-like particle at a mass of 125 GeV. Limits are also set on the production cross section ⇥ branching ratio of additional Higgs-like particles that decay invisibly in the mass range: 115 GeV to 300 GeV. In the combination of the 7 TeV data and 8 TeV toy-data, an expected (observed) upper limit of0.89 (0.59) is set on the branching ratio to invisible particles of a 125 GeV Higgs boson. In the mass range 115 to 300 GeV, no excess beyond the Standard Model expectation is observed. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson TI - Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson UR - http://hdl.handle.net/11427/9216 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/9216
dc.identifier.vancouvercitationMwewa C. Statistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Boson. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9216en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.titleStatistical interpretation of exotics monojet data in search of an invisibly decaying Higgs Bosonen_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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