Single top channel in association with H→bb̄ production at ATLAS : a feasible study

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dc.contributor.advisorHamilton, Andrewen_ZA
dc.contributor.advisorGray, Heather Men_ZA
dc.contributor.authorAntel, Claireen_ZA
dc.date.accessioned2015-12-10T09:35:35Z
dc.date.available2015-12-10T09:35:35Z
dc.date.issued2015en_ZA
dc.description.abstractA degeneracy in the minima of the profile likelihood function of the Higgs boson coupling to fermions and bosons, where boson couplings are assumed to be positive, is reported by both ATLAS and CMS. Although one minimum lies in the region of positive fermionic coupling scale factors, consistent with the Standard Model, the second minimum lies in the negative region-a region which would indicate new physics. This degeneracy can potentially be resolved by studying a fermionic-bosonic interference that takes place in the single top quark production in association with a Higgs particle, in which the cross-section is significantly enhanced for anomalous coupling values. A truth level feasibility study of the tH process with H→bb̄ is conducted at 8 TeV and 21 fb-¹ of integrated luminosity. the equivalent of the 2012 run at the LHC. A sensitivity of l.7σ is found for the enhanced case of a coupling scale factor of cF = -1. This is insufficient for a detection. A projection to 14 TeV centre-of-mass energies indicates that at truth-level a 3σ significance with 15 fb-¹ of integrated luminosity can be reached for the enhanced case. However, assuming as low as 5% systematic uncertainty lowers this to below 2σ across the whole luminosity range, indicating that the upcoming run at LHC will also be insufficient to resolve the degeneracy.en_ZA
dc.identifier.apacitationAntel, C. (2015). <i>Single top channel in association with H→bb̄ production at ATLAS : a feasible study</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/15768en_ZA
dc.identifier.chicagocitationAntel, Claire. <i>"Single top channel in association with H→bb̄ production at ATLAS : a feasible study."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 2015. http://hdl.handle.net/11427/15768en_ZA
dc.identifier.citationAntel, C. 2015. Single top channel in association with H→bb̄ production at ATLAS : a feasible study. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Antel, Claire AB - A degeneracy in the minima of the profile likelihood function of the Higgs boson coupling to fermions and bosons, where boson couplings are assumed to be positive, is reported by both ATLAS and CMS. Although one minimum lies in the region of positive fermionic coupling scale factors, consistent with the Standard Model, the second minimum lies in the negative region-a region which would indicate new physics. This degeneracy can potentially be resolved by studying a fermionic-bosonic interference that takes place in the single top quark production in association with a Higgs particle, in which the cross-section is significantly enhanced for anomalous coupling values. A truth level feasibility study of the tH process with H→bb̄ is conducted at 8 TeV and 21 fb-¹ of integrated luminosity. the equivalent of the 2012 run at the LHC. A sensitivity of l.7σ is found for the enhanced case of a coupling scale factor of cF = -1. This is insufficient for a detection. A projection to 14 TeV centre-of-mass energies indicates that at truth-level a 3σ significance with 15 fb-¹ of integrated luminosity can be reached for the enhanced case. However, assuming as low as 5% systematic uncertainty lowers this to below 2σ across the whole luminosity range, indicating that the upcoming run at LHC will also be insufficient to resolve the degeneracy. DA - 2015 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - Single top channel in association with H→bb̄ production at ATLAS : a feasible study TI - Single top channel in association with H→bb̄ production at ATLAS : a feasible study UR - http://hdl.handle.net/11427/15768 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/15768
dc.identifier.vancouvercitationAntel C. Single top channel in association with H→bb̄ production at ATLAS : a feasible study. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 2015 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/15768en_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.titleSingle top channel in association with H→bb̄ production at ATLAS : a feasible studyen_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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