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@PHDTHESIS{Weiss:331118,
      author       = {Weiss, Christian},
      othercontributors = {Reuter, Juergen and Kniehl, Bernd},
      title        = {{T}op quark physics as a prime application of automated
                      higher-order corrections.},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2017-07541, DESY-THESIS-2017-025},
      series       = {DESY-THESIS},
      pages        = {173},
      year         = {2017},
      note         = {Dissertation, Universität Hamburg, 2017},
      abstract     = {Experiments in high energy physics have reached an
                      unprecedented accuracy. Thisaccuracy has to be matched by
                      the theoretical predictions used to search for new
                      physics.For this purpose, sophisticated computer programs
                      are necessary, both for the calculationof matrix elements
                      (tree-level and loop) and in the field of Monte-Carlo event
                      generation.The hadronic initial state at the LHC poses
                      signifcant challenges for measurement andsimulation. A
                      future lepton collider, like the proposed international
                      linear collider (ILC)in Japan or compact linear collider
                      (CLIC) at CERN would have a much cleaner initialstate. Such
                      a machine would achieve an even higher precision. In the
                      field of leptoncolliders, the Whizard event generator has
                      been established as the program of choicedue to its unique
                      treatment of beam structure functions and initial-state
                      radiation. Inthis thesis, we present the extension of
                      Whizard to next-to-leading order accuracy,thus augmenting it
                      to the state of the art. We use the Frixione-Kunszt-Signer
                      (FKS)subtraction scheme to subtract divergences, of which a
                      detailed outline is given. Thisnew functionality is used to
                      perform in-depth studies of the top quark. Being the
                      heaviestparticle in the standard model, its strong
                      connection to the Higgs sector as well as itsabundant
                      production at a future lepton collider makes it an excellent
                      object of study.Yet, its lifetime is very short and
                      high-multiplicity final-states of its decay products
                      aredecayed in the detector.This thesis investigates the
                      influence of NLO QCD corrections to the fully off-shell
                      topproduction processes e + e − → μ + ν μ e − ν ̄
                      e b ̄ b and e + e − → μ + ν μ e − ν ̄ e b ̄ bH.
                      These calcuationshave not been performed for the first time.
                      Moreover, the incorporation of NLO QCDcorrections into the
                      resummation of the top production threshold and its matching
                      tothe relativistic continuum for the process e + e − →
                      bW + ̄ bW − . All results are obtainedwith Whizard
                      interfaced to the matrix-element generator OpenLoops.},
      cin          = {T},
      cid          = {I:(DE-H253)T-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-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2017-07541},
      url          = {https://bib-pubdb1.desy.de/record/331118},
}