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Search for Higgs boson pair production in the bƃbƃ final state at the Large Hadron Collider

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Title: Search for Higgs boson pair production in the bƃbƃ final state at the Large Hadron Collider
Authors: Falla, R. J.
Committee Members: Konstantinidis, N.
Summary: The work presented in this thesis focuses on the search for resonant and non-resonant Higgs boson pair production in the bƃbƃ final state at the LHC. All of the searches require the use of high transverse momentum b-tagged jet systems. The first search presented is performed using a dataset of proton- proton collisions at √s = 8 TeV, collected in 2012 with the ATLAS detector, corresponding to an integrated luminosity of 19.5 fb^{-1}. The Higgs boson decay products are reconstructed as a pair of close- by small radius b-tagged jets with a high transverse momentum, known as "dijets". The resonant signals looked for are a Randall- Sundrum Kaluza-Klein graviton, G^*, and a heavy neutral scalar boson in the 2HDM model, H. A non-resonant search is also performed. No evidence for resonant or non-resonant Higgs boson pair production is observed. An upper limit on the cross-section for σ(pp → G^* →hh→bƃbƃ) of 3.2 fb is set for a G^* mass of 1.0 TeV, at the 95% confidence level. The search for non-resonant Standard Model hh production sets an observed 95% confidence level upper limit on the production cross-section σ(pp → hh → bƃbƃ) of 202 fb, compared to a SM prediction of σ(pp → hh → bƃbƃ) = 3.6 ± 0.5 fb. In preparation for Run 2 and the HL-LHC simulation studies based on √s = 14 TeV are made. A non-resonant search using the dijet method used in Run 1 is presented. A resonant study is also presented which shows a new method for reconstructing pp → X →hh→bƃbƃ events. It uses the combination of many Higgs boson reconstruction techniques which vary with the Higgs boson transverse momentum and is shown to be excellent at providing a high signal efficiency.
URL: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763095
Database: OpenDissertations
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Header DbId: ddu
DbLabel: OpenDissertations
An: ddu.oai.ethos.bl.uk.763095
AccessLevel: 6
PubType: Dissertation/ Thesis
PubTypeId: dissertation
PreciseRelevancyScore: 0
IllustrationInfo
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  Label: Title
  Group: Ti
  Data: Search for Higgs boson pair production in the bƃbƃ final state at the Large Hadron Collider
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  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Falla%2C+R%2E+J%2E%22">Falla, R. J.</searchLink>
– Name: Author
  Label: Committee Members
  Group: Au
  Data: <searchLink fieldCode="CO" term="%22Konstantinidis%2C+N%2E%22">Konstantinidis, N.</searchLink>
– Name: Abstract
  Label: Summary
  Group: Ab
  Data: The work presented in this thesis focuses on the search for resonant and non-resonant Higgs boson pair production in the bƃbƃ final state at the LHC. All of the searches require the use of high transverse momentum b-tagged jet systems. The first search presented is performed using a dataset of proton- proton collisions at √s = 8 TeV, collected in 2012 with the ATLAS detector, corresponding to an integrated luminosity of 19.5 fb^{-1}. The Higgs boson decay products are reconstructed as a pair of close- by small radius b-tagged jets with a high transverse momentum, known as "dijets". The resonant signals looked for are a Randall- Sundrum Kaluza-Klein graviton, G^*, and a heavy neutral scalar boson in the 2HDM model, H. A non-resonant search is also performed. No evidence for resonant or non-resonant Higgs boson pair production is observed. An upper limit on the cross-section for σ(pp → G^* →hh→bƃbƃ) of 3.2 fb is set for a G^* mass of 1.0 TeV, at the 95% confidence level. The search for non-resonant Standard Model hh production sets an observed 95% confidence level upper limit on the production cross-section σ(pp → hh → bƃbƃ) of 202 fb, compared to a SM prediction of σ(pp → hh → bƃbƃ) = 3.6 ± 0.5 fb. In preparation for Run 2 and the HL-LHC simulation studies based on √s = 14 TeV are made. A non-resonant search using the dijet method used in Run 1 is presented. A resonant study is also presented which shows a new method for reconstructing pp → X →hh→bƃbƃ events. It uses the combination of many Higgs boson reconstruction techniques which vary with the Higgs boson transverse momentum and is shown to be excellent at providing a high signal efficiency.
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  Data: <link linkTarget="URL" linkTerm="https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763095" linkWindow="_blank">https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.763095</link>
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RecordInfo BibRecord:
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      – Code: eng
        Text: English
    Subjects:
      – SubjectFull: 539.7
        Type: general
    Titles:
      – TitleFull: Search for Higgs boson pair production in the bƃbƃ final state at the Large Hadron Collider
        Type: main
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            NameFull: Falla, R. J.
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          Dates:
            – D: 01
              M: 01
              Type: published
              Y: 2016
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