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@PHDTHESIS{Fackeldey:979839,
      author       = {Fackeldey, Manfred Peter},
      othercontributors = {Erdmann, Martin and Schmidt, Alexander},
      title        = {{S}earch for {H}iggs boson pair production in the bb{WW}
                      final state with leptonic {W} boson decays at the {CMS}
                      experiment},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2024-01878},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2024},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, RWTH Aachen University, 2024},
      abstract     = {This thesis presents a search for Higgs boson pair
                      production in the HH -> bbW+W- decay channel where both W
                      bosons decay leptonically. The search uses data from
                      proton-proton collisions at a center-of-mass energy of
                      $\sqrt{s}$ = 13 TeV at the LHC. In total, data collected by
                      the CMS experiment corresponding to an integrated luminosity
                      of 138 fb-1 are analyzed. The biggest challenge of the
                      presented analysis is the small amount of expected signal
                      events compared to the large amount of background events.
                      This imbalance of expected events requires a well understood
                      modelling of the background processes. A dedicated deep
                      learning based analysis strategy is used to tackle these
                      challenges. In addition, novel computing technologies are
                      leveraged to enable a sustainable and efficient analysis. No
                      evidence for the production of Higgs boson pairs is found.
                      Upper exclusion limits on the inclusive signal strength
                      modifier are observed (expected) to be 19 (27), and 385
                      (424) on the HH(VBF) signal strength modifier at $95\%$ CLs.
                      The Higgs boson self-coupling (kl) and the direct coupling
                      between two Higgs bosons and two vector bosons (k2V) are
                      measured to be kl = 3.17 (+6.19) (-6.15) and k2V = 1.04
                      (+1.56) (-1.53). In addition, both couplings are constrained
                      with observed (expected) exclusion limits in the range of
                      -8.64 <= kl <= 15.21 (-11.43 <= kl <= 17.83) and -1.71 <=
                      k2V <= 3.84 (-2.22 <= k2V <= 4.37). These measurements do
                      not deviate from the expectation of the SM, and mark the
                      strictest results in the HH -> bbW+W- decay channel to
                      date.},
      cin          = {133110 / 130000},
      ddc          = {530},
      cid          = {$I:(DE-82)133110_20140620$ / $I:(DE-82)130000_20140620$},
      pnm          = {05H23PACCA - Verbundprojekt 05H2021 (ErUM-FSP T03) - Run 3
                      von CMS am LHC: Physik der kleinsten Teilchen mit dem
                      CMS-Experiment (BMBF-05H23PACCA)},
      pid          = {G:(DE-Ds200)BMBF-05H23PACCA},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2024-01878},
      url          = {https://publications.rwth-aachen.de/record/979839},
}