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Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector

The search of the Standard Model Higgs boson decaying into a pair of weak bosons with the subsequent leptonic decay of the $W$ or $Z$ bosons is presented. The contributions achieved by this work range from the reevaluation of Higgs boson normalisation cross-sections, to the development of the analys...

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Autor principal: Carrillo-Montoya, Germán
Lenguaje:eng
Publicado: 2013
Materias:
Acceso en línea:http://cds.cern.ch/record/1545795
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author Carrillo-Montoya, Germán
author_facet Carrillo-Montoya, Germán
author_sort Carrillo-Montoya, Germán
collection CERN
description The search of the Standard Model Higgs boson decaying into a pair of weak bosons with the subsequent leptonic decay of the $W$ or $Z$ bosons is presented. The contributions achieved by this work range from the reevaluation of Higgs boson normalisation cross-sections, to the development of the analysis strategies using detailed Monte Carlo simulations and the search results for the $H \to ZZ \to l^{+}l^{-} \nu\bar{\nu}$, decay mode based on 4.7 fb$^{-1}$, of proton-proton collision data at $\sqrt{s}$ = 7 TeV taken during 2011 by the ATLAS detector. The computation of cross-sections values for Higgs boson production at centre-of-mass energies varying from 6 to 14 TeV, for the main production mechanisms at the LHC were documented for posterior usage among the Collaboration. Preliminary detector resolution studies on $Z \to\mu\mu$ events using early data collected by ATLAS are also described. Simulation studies for the $H \to ZZ^{(*)} \to l^{+}l^{-}l^{+}l^{-}$ and $H \to W^{+}W^{-} \to l^{+}\nu l^{-}\bar{\nu}$ channels included feasibility checks used to quantify the expected sensitivity of the analyses for various scenarios with different centre-of-mass energy, luminosity and detector calibration conditions. These results were part of the input that the Collaboration used to feed the schedule and plans of the LHC. On the $H \to ZZ \to l^{+}l^{-}\nu\bar{\nu}$ channel, upper limits on the Higgs boson production cross-section in a mass range between 200 and 900 GeV are set. With this channel by itself, the Standard Model Higgs boson particle is excluded at 95% confidence level in the mass range between 319 and 558 GeV. To complete the current picture of the Higgs boson searches in the ATLAS detector, a compilation of the different Higgs boson analyses performed by the ATLAS Collaboration are introduced. The Higgs boson existence is constrained to be in a narrow window between 122.5 GeV and 129 GeV with 95% confidence level; where an excess of 2.6 $\sigma$ local significance is observed.
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institution Organización Europea para la Investigación Nuclear
language eng
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spelling cern-15457952019-09-30T06:29:59Zhttp://cds.cern.ch/record/1545795engCarrillo-Montoya, GermánStandard Model Higgs boson searches in the weak boson decay channels with the ATLAS detectorParticle Physics - ExperimentThe search of the Standard Model Higgs boson decaying into a pair of weak bosons with the subsequent leptonic decay of the $W$ or $Z$ bosons is presented. The contributions achieved by this work range from the reevaluation of Higgs boson normalisation cross-sections, to the development of the analysis strategies using detailed Monte Carlo simulations and the search results for the $H \to ZZ \to l^{+}l^{-} \nu\bar{\nu}$, decay mode based on 4.7 fb$^{-1}$, of proton-proton collision data at $\sqrt{s}$ = 7 TeV taken during 2011 by the ATLAS detector. The computation of cross-sections values for Higgs boson production at centre-of-mass energies varying from 6 to 14 TeV, for the main production mechanisms at the LHC were documented for posterior usage among the Collaboration. Preliminary detector resolution studies on $Z \to\mu\mu$ events using early data collected by ATLAS are also described. Simulation studies for the $H \to ZZ^{(*)} \to l^{+}l^{-}l^{+}l^{-}$ and $H \to W^{+}W^{-} \to l^{+}\nu l^{-}\bar{\nu}$ channels included feasibility checks used to quantify the expected sensitivity of the analyses for various scenarios with different centre-of-mass energy, luminosity and detector calibration conditions. These results were part of the input that the Collaboration used to feed the schedule and plans of the LHC. On the $H \to ZZ \to l^{+}l^{-}\nu\bar{\nu}$ channel, upper limits on the Higgs boson production cross-section in a mass range between 200 and 900 GeV are set. With this channel by itself, the Standard Model Higgs boson particle is excluded at 95% confidence level in the mass range between 319 and 558 GeV. To complete the current picture of the Higgs boson searches in the ATLAS detector, a compilation of the different Higgs boson analyses performed by the ATLAS Collaboration are introduced. The Higgs boson existence is constrained to be in a narrow window between 122.5 GeV and 129 GeV with 95% confidence level; where an excess of 2.6 $\sigma$ local significance is observed.CERN-THESIS-2012-306oai:cds.cern.ch:15457952013-05-07T11:40:07Z
spellingShingle Particle Physics - Experiment
Carrillo-Montoya, Germán
Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector
title Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector
title_full Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector
title_fullStr Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector
title_full_unstemmed Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector
title_short Standard Model Higgs boson searches in the weak boson decay channels with the ATLAS detector
title_sort standard model higgs boson searches in the weak boson decay channels with the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1545795
work_keys_str_mv AT carrillomontoyagerman standardmodelhiggsbosonsearchesintheweakbosondecaychannelswiththeatlasdetector