Hageböck, Stephan: Search for the H → bb Decay of the Standard Model Higgs Boson in Associated Production with Vector Bosons Using ATLAS Data at √s = 8 TeV. - Bonn, 2018. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5n-52108
@phdthesis{handle:20.500.11811/7645,
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5n-52108,
author = {{Stephan Hageböck}},
title = {Search for the H → bb Decay of the Standard Model Higgs Boson in Associated Production with Vector Bosons Using ATLAS Data at √s = 8 TeV},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2018,
month = oct,

note = {In this thesis, a search for the H → bb decay of the Standard Model Higgs boson is presented. A dataset of 20.2 fb-1 recorded by the ATLAS detector at CERN is searched for events where Higgs bosons are produced in association with a vector boson that decays to charged leptons at a centre-of-mass energy of √s = 8 TeV. Machine learning with boosted decision trees is used to implement the most sensitive V H → V bb search on √s = 8 TeV LHC data with charged leptons, the ATLAS search published in 2015. It is further shown that the machine-learning part of this search can be improved by training boosted decision trees with Lorentz-invariant observables, which increases the sensitivity by 10 %, and reduces systematic uncertainties by 16 %. For a Higgs boson of mH = 125 GeV, a local excess over the background prediction at 99.2 % confidence level is observed, which corresponds to a discovery significance of 2.4 σ, whereas 1.9 σ were expected from simulations. The ratio of the observed signal strength compared to the Standard Model prediction is μ = 1.3 +0.7 -0.6.},
url = {https://hdl.handle.net/20.500.11811/7645}
}

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