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Title: Experimental study of the properties of the Higgs boson
Author: Mudd, Richard David
ISNI:       0000 0004 5924 1386
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2016
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Measurements of Higgs boson production and decay rates are presented using the proton-proton collision data collected by the ATLAS experiment during LHC Run I, corresponding to 4.5 fb\(^-\)\(^1\) at 7 TeV and 20.3 fb\(^-\)\(^1\) at 8 TeV. Under certain assumptions, the coupling strengths of the Higgs boson to Standard Model particles are also probed. The H -> ZZ\(^(\)\(^*\)\(^)\)\(_-\)\(_>\) 4I final state, where I = e, mu, is discussed, and is observed with a significance corresponding to 8.1 standard deviations. The Higgs boson production rate, relative to the Standard Model prediction, is measured to be mu = 1.44\(^+\)\(^0\)\(^.\)\(^4\)\(^0\)\(_-\)\(_0\)\(_.\)\(_3\)\(_3\) at the ATLAS best-fit value for the measurement of the Higgs boson mass, m\(_H\) = 125.36 GeV. The various Higgs boson production and decay modes studied by the ATLAS experiment are also combined. The couplings of the Higgs boson are probed in a number of benchmark models, where a good agreement with the Standard Model prediction is observed for each model considered. The Higgs boson coupling measurements are also used to place constraints on a number of beyond the Standard Model theories, and are combined with direct searches for invisible Higgs boson decays to place a limit on the Higgs boson branching ratio to invisible final states.
Supervisor: Not available Sponsor: Science and Technology Facilities Council ; University of Birmingham
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics