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@PHDTHESIS{Sahin:320460,
      author       = {Sahin, Mehmet Ozgur},
      othercontributors = {Melzer-Pellmann, Isabell and Schleper, Peter},
      title        = {{S}earch for {S}upersymmetric {T}op-{Q}uark {P}artners
                      {U}sing {S}upport {V}ector {M}achines and {U}pgrade of the
                      {H}adron {C}alorimeter {F}ront-{E}nd {R}eadout {C}ontrol
                      {S}ystem at {CMS}},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2017-01744, DESY-THESIS-2017-014},
      series       = {DESY-THESIS},
      pages        = {171},
      year         = {2017},
      note         = {Dissertation, Universität Hamburg, 2016},
      abstract     = {In this thesis a search for direct pair production of
                      supersymmetric top-quark partners as well as work on the
                      upgrade of the front-end readout controller of the Hadron
                      Calorimeter (HCAL) of the Compact Muon Solenoid (CMS)
                      experiment are presented. The most appealing extension of
                      the Standard Model (SM) is supersymmetry (SUSY), relating
                      the integer spin (bosons) and half-integer spin elementary
                      particles (fermions). Supersymmetric top-quark partners (top
                      squark) around and below the TeV energy scale offer a
                      solution to the hierarchy problem. Furthermore, R-parity
                      conserving SUSY models propose a cold dark matter candidate
                      in the form of stable lightest supersymmetric particles
                      (LSP), eg lightest neutralinos. The analysis performed in
                      this thesis is a search for top-squark pair production in a
                      final state consisting of a single isolated lepton, jets,
                      among which at least one is tagged as bottom-quark jet, and
                      large missing transverse energy at the CMS experiment at the
                      CERN Large Hadron Collider (LHC) with 8 TeV center-of-mass
                      energy. A new Support Vector Machines (SVM) High-Energy
                      Physics interface (SVM-HINT) software is introduced to
                      classify signal events originating from new physics
                      processes and the SM background. SVM-HINT is enhanced with a
                      novel statistical significance based optimization algorithm
                      providing a state-of-the-art classification power. Monte
                      Carlo simulations are used in the training and optimization
                      procedure, and high signal purity search regions are
                      determined in the search for top-squark pair production. The
                      background event yields in each search region are predicted
                      using a data-driven background estimation method. The
                      results are interpreted within a simplified model assuming a
                      top squark branching ratio of $100\%$ to top-quark and LSP.
                      No significant discrepancy between the data and the SM
                      predictions has been observed. Exclusion limits were derived
                      to constrain the mass of top squark and mass of LSP of the
                      investigated simplified model. The sensitivity of the
                      previous searches with the 8 TeV center-of-mass energy in
                      the single lepton final states is extended to 675 GeV top
                      squark mass and 225 GeV LSP mass.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) / PHGS,
                      VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF3-611 / $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2017-01744},
      url          = {https://bib-pubdb1.desy.de/record/320460},
}