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Title: Discovery and measurement of the Higgs boson in the WW decay channel
Author: Hall, David Christopher
ISNI:       0000 0004 5365 5115
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2014
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In the Standard Model of particle physics, the non-zero masses of the W and Z bosons and the fermions are generated through interactions with the Higgs field, excitations of which correspond to Higgs bosons. Thus, the experimental discovery of the Higgs boson is of prime importance to physics, and would confirm our understanding of fundamental mass generation. This thesis describes a search for the gg → H → WW → lνlν process of Higgs boson production and decay. It uses the LHC Run I dataset of pp collisions recorded by the ATLAS detector, which corresponds to an integrated luminosity of 4.5 fb−1 at √s = 7 TeV and 20.3 fb−1 at √s = 8 TeV. An excess of events is observed with a significance of 4.8 standard deviations, which is consistent with Higgs boson production. The significance is extended to 6.1 standard deviations when the vector boson fusion production process is included. The measured signal strength is 1.11+0.23-0.21 at mH = 125 GeV. A cross section measurement of WW production, a major background to this search, is also presented using the √s = 7 TeV dataset only.
Supervisor: Hays, Christopher Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Particle physics ; Higgs boson