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@PHDTHESIS{Knolle:442689,
      author       = {Knolle, Joscha},
      othercontributors = {Meyer, Andreas and Haller, Johannes},
      title        = {{M}easuring luminosity and the
                      $\mathrm{t}\bar{\mathrm{t}}\mathrm{{Z}}$ production cross
                      section with the {CMS} experiment},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2020-03187, DESY-THESIS-2020-020},
      series       = {DESY-THESIS},
      pages        = {164},
      year         = {2020},
      note         = {Dissertation, Universität Hamburg, 2020},
      abstract     = {Measurements of the luminosity and of top quark pair
                      production in association with a Z boson
                      ($\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$) in proton-proton
                      collisions with the CMS experiment at the LHC are
                      presented.The luminosity measurement of the CMS experiment
                      is calibrated with the Van der Meer (VdM) method, based on
                      data collected during beam separation scans. A calibration
                      of the length scale is performed using data from
                      constant-separation scans. The bias of the VdM method due to
                      the assumption of factorisable proton densities of the beams
                      is estimated with an improved method using the transverse
                      densities as determined from beam-imaging scan data. The
                      performance is evaluated with dedicated simulation studies.
                      Both studies lead to a significant reduction of the
                      systematic uncertainty for the measurement of the integrated
                      luminosity.Measurements of
                      $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ production in
                      proton-proton collisions at a centre-of-mass energy of 13
                      TeV are performed using events with three charged leptons
                      where the Z boson is identified in its decay to two
                      oppositely charged leptons. The first differential
                      $\mathrm{t}\bar{\mathrm{t}}\mathrm{Z}$ production cross
                      section measurement as a function of kinematic properties of
                      the Z boson is presented, based on a dataset corresponding
                      to an integrated luminosity of 77.5/fb collected in 2016 \&
                      2017. An extended differential measurement as a function of
                      top quark observables is presented using the full Run 2
                      dataset, corresponding to an integrated luminosity of
                      137/fb. It includes a kinematic reconstruction of the
                      $\mathrm{t}\bar{\mathrm{t}}$ system and allows to probe the
                      QCD production mechanism. Within current experimental
                      uncertainties, the measured differential cross sections are
                      found to be in good agreement with standard model
                      predictions.},
      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-2020-03187},
      url          = {https://bib-pubdb1.desy.de/record/442689},
}