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@PHDTHESIS{Sert:293539,
      author       = {Sert, Hale},
      title        = {{L}ight {H}iggsinos at the {ILC}: {P}recision
                      {M}easurements and {D}etector {R}equirements},
      issn         = {1435-8085},
      school       = {Universität Hamburg},
      type         = {Dr.},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2016-00621, DESY-THESIS-2016-001},
      series       = {DESY-THESIS},
      pages        = {271},
      year         = {2016},
      note         = {Universität Hamburg, Diss., 2015},
      abstract     = {This thesis is based on a study of Natural Supersymmetry
                      (SUSY) scenarios at the International Linear Collider (ILC).
                      These scenarios are motivated by naturalness, which requires
                      the mu parameter to be at the electroweak scale. The
                      considered Natural SUSY scenario contains three light
                      higgsino-like charginos and neutralinos with a mass
                      splitting of a few GeV or even sub-GeV, while all other
                      supersymmetric particles are heavy in the multi-TeV scale.
                      Due to the small mass difference of a few GeV, the final
                      state consists of a large missing energy and a few very soft
                      visible particles. Therefore, the analysis of such scenarios
                      is extremely challenging for the LHC as well as the ILC. In
                      order to investigate the feasibility of observing light
                      higgsinos at the ILC, an analysis has been performed using
                      both fast detector simulation and full detector simulation
                      for International Large Detector (ILD). The fast simulation
                      results have indicated that the key observables of the
                      higgsinos can be reconstructed with an uncertainty of a few
                      percent. It has been shown that the results enable
                      determining the lower limits and allowed regions for the
                      mass parameters of the bino M1 and the wino M2, as well as
                      determining the higgsino mass parameter µ to the accuracy
                      of a few percent. The full simulation analysis has provided
                      information about detector requirements, such as the
                      identification of low momentum electrons and muons. The
                      electron identification can be studied by using the
                      ionisation energy loss of the particles per length, dE/dx,
                      which can be obtained from the Time Projection Chamber (TPC)
                      of ILD. The identification of low momentum muons has been
                      studied in the context of the thesis by using the
                      calorimeter cluster shape differences between muons and
                      pions. As a result, a method has been developed for
                      particles with momentum lower than 2 GeV, and its impact on
                      the higgsino analysis has been investigated. It has been
                      found that assuming the electrons can be identified with the
                      same efficiency as the muons, the key observables can be
                      reconstructed with the same precision as in the fast
                      simulation case by taking two times more data.The presence
                      of soft final-state particles makes the tracking of high
                      relevance for the analysis. Therefore, a comprehensive
                      hardware study related to the TPC of ILD has been performed.
                      In this study, three commonly used gas mixtures have been
                      investigated in a small gas chamber containing a triple Gas
                      Electron Multiplier stack, and their performance has been
                      compared. This study has enhanced the understanding of the
                      dependency of the charge transfer on the gas type. It has
                      confirmed that the gas proposed to be used in the TPC is the
                      most promising one.},
      cin          = {FLC},
      cid          = {I:(DE-H253)FLC-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) / SFB 676
                      B01 - Optimierung des ILC setups: Physikprogramm,
                      Betriebsszenarien und Designentscheidungen (B01) (28895157)},
      pid          = {G:(DE-HGF)POF3-611 / G:(GEPRIS)28895157},
      experiment   = {EXP:(DE-H253)ILC(machine)-20150101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
      doi          = {10.3204/DESY-THESIS-2016-001},
      url          = {https://bib-pubdb1.desy.de/record/293539},
}