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@PHDTHESIS{Draeger:295971,
      author       = {Draeger, Arne-Rasmus},
      othercontributors = {Sander, Christian and Schleper, Peter},
      title        = {{P}rediction of the $\text{t}\bar{\text{t}}$ and
                      $\text{{W}}+\text{{J}ets}$ {B}ackground in a {S}earch for
                      {N}ew {P}hysics with {J}ets and {M}issing {T}ransverse
                      {E}nergy at {CMS}},
      issn         = {1435-8085},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2016-01240, DESY-THESIS-2016-005},
      series       = {DESY-THESIS},
      pages        = {261},
      year         = {2016},
      note         = {Dissertation, Universität Hamburg, 2016},
      abstract     = {One of the primary goals of the LHC is the search for
                      physics beyond the Standard Model (SM). Among the most
                      studied extensions of the SM is supersymmetry (SUSY), which
                      postulates a symmetry between fermions and bosons and
                      requires the introduction of a SUSY partner particle for
                      every SM particle. At the LHC the production of colored SUSY
                      particles (squarks $\tilde{\text{q}}$ and gluinos
                      $\tilde{\text{g}}$) can have a significant cross section,
                      leading to distinct signatures. These particles decay to
                      lighter new particles typically emitting quarks and gluons.
                      Furthermore, the lightest SUSY particle is often assumed to
                      be stable and only weakly interacting, hence it escapes the
                      detector and leads to missing transverse energy.\\ In this
                      thesis, a search for such new particles with proton-proton
                      collision data recorded at the CMS experiment at
                      $\sqrt{s}=8\ \text{TeV}$, corresponding to an integrated
                      luminosity of $19.5 \text{fb}^{-1}$, which is performed in
                      the final states with jets, missing transverse momentum, and
                      no isolated muons or electrons. All SM background
                      contributions are determined from data. A major background
                      contribution arises from $\text{t}\bar{\text{t}}$ and
                      $\text{W}+\text{Jets}$ events where a W boson decays into an
                      electron or muon which is not identified in the detector,
                      referred to as "lost-lepton". Such events contribute to the
                      search selections if the muons and electrons are
                      unidentified, here denoted as ``lost-leptons''. The main
                      focus of this thesis is on the development and validation of
                      a method to estimate the amount of lost-lepton events using
                      a single-lepton control sample from data.\\The number of
                      observed events are found to be consistent with the SM
                      background expectation. Upper exclusion limits on SUSY
                      particle masses are derived in different simplified models
                      of $\tilde{\text{g}}$ and $\tilde{\text{q}}$ pair
                      production. The production of light-flavor
                      $\tilde{\text{q}}$ below a mass of 780 GeV and
                      $\tilde{\text{g}}$ with masses below 1.1-1.2 TeV are
                      excluded at 95\\% confidence level. Furthermore, the
                      lost-lepton prediction method is refined for the application
                      to the new LHC data at $\sqrt{s}=13\ \text{TeV}$ , and the
                      performance of the relevant physics object reconstruction is
                      demonstrated using the first $42 \text{pb}^{-1}$ of
                      $\sqrt{s}=13\ \text{TeV}$ data.},
      cin          = {UNI/EXP / CMS / ATLAS},
      cid          = {$I:(DE-H253)UNI_EXP-20120731$ / I:(DE-H253)CMS-20120731 /
                      I:(DE-H253)ATLAS-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
      doi          = {10.3204/DESY-THESIS-2016-005},
      url          = {https://bib-pubdb1.desy.de/record/295971},
}