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@PHDTHESIS{Habermehl:417605,
      author       = {Habermehl, Moritz},
      othercontributors = {List, Jenny and Horns, Dieter},
      title        = {{D}ark {M}atter at the {I}nternational {L}inear {C}ollider},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2018-05723, DESY-THESIS-2018-039},
      series       = {DESY-THESIS},
      pages        = {253},
      year         = {2018},
      note         = {Dissertation, Universität Hamburg, 2018},
      abstract     = {The International Linear Collider (ILC) is a planned
                      electron-positron colliderwith polarised beams and
                      centre-of-mass energies of up to 500 GeV. By
                      performinghigh-precision measurements of Standard Model
                      observables and searches for newparticles it can complement
                      the potential of the Large Hadron Collider (LHC).One of the
                      most prominent open questions in physics is the nature of
                      dark matter.Weakly Interacting Massive Particles (WIMPs) are
                      possible candidates for darkmatter, which can be searched
                      for at colliders. In this thesis, the expected sensitivityto
                      a WIMP signal at the ILC is explored in a Monte Carlo study.
                      The WIMPs areassumed to be produced in pairs together with a
                      photon from initial state radiation,through which the
                      process can be identied.A detector simulation $\sqrt{s}$ =
                      500 GeV is performed for the International LargeDetector
                      (ILD) concept, including beam-induced backgrounds and the
                      luminosityspectrum. In comparison to previous studies many
                      aspects of the analysis are treatedin a more realistic way:
                      e.g. the cuts in the event generation have been updated,a
                      complete description of the reconstruction in the crucial
                      forward region has beenadded and the systematic
                      uncertainties of the luminosity spectrum have been
                      fullytreated for the rst time.In order to provide a
                      model-independent WIMP search, the approach of
                      eectiveoperators is chosen to describe the new interaction.
                      The photon energy spectra fordierent signal hypotheses and
                      the distribution of the Standard Model backgroundare used to
                      calculate the expected 5 discovery reach as well as the
                      2$\sigma$ exclusionlimits. For the example of a vector
                      operator, energy scales of up to 3TeV can betested for WIMP
                      masses $\lesssim$ 250 GeV assuming 20 years of operation.
                      With beampolarisation the sensitivity can be increased and
                      with the help of data sets takenwith dierent polarisation
                      congurations the eect of the systematic uncertaintiescan be
                      signicantly reduced. The role of the forward acceptance for
                      the suppressionof the Bhabha scattering background is
                      quantied.With two dierent approaches, estimates for the
                      sensitivity at other centre-ofmassenergies than the 500 GeV
                      of the full simulation can be calculated. This allowsto
                      provide results for the full ILC programme, e.g. energy
                      scales of up to 1.4TeV canbe probed with an initial stage of
                      the ILC at a centre-of-mass energy of 250 GeV,while energy
                      scales of up to 4.5TeV could be probed $\sqrt{s}$ = 1TeV.},
      cin          = {FLC},
      cid          = {I:(DE-H253)FLC-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)ILC(machine)-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2018-05723},
      url          = {https://bib-pubdb1.desy.de/record/417605},
}