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@PHDTHESIS{RibeiroLopes:599191,
      author       = {Ribeiro Lopes, Beatriz},
      othercontributors = {Jafari, Abideh and Gallo-Voss, Elisabetta},
      title        = {{D}ifferential ratio measurements of
                      $\mathrm{t\bar{t}\gamma}\,/\,\mathrm{t\bar{t}}$ and a search
                      for exclusive $\mathrm{t\bar{t}}$ with the {CMS} experiment},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron DESY},
      reportid     = {PUBDB-2023-07215, DESY-THESIS-2023-019.
                      CERN-THESIS-2023-256},
      series       = {DESY-THESIS},
      pages        = {207},
      year         = {2023},
      note         = {Dissertation, Universität Hamburg, 2023},
      abstract     = {In this thesis, measurements performed using proton-proton
                      collision data at $\sqrt{s} = 13$TeV collected by the CMS
                      experiment at the CERN LHC, in the years 2016, 2017, and
                      2018, are presented. The data correspond to an integrated
                      luminosity of 138$~\mathrm{fb}^{-1}$.New results on top
                      quark pair production in association with a photon
                      ($\mathrm{t\bar{t}\gamma}$) are presented. Differential
                      cross sections are presented, measuring five different
                      observables that are sensitive to modelling aspects and
                      possible effects of new physics. In particular, top quark
                      observables are measured for the first time, using a top
                      quark pair ($\mathrm{t\bar{t}}$) reconstruction algorithm.
                      Experiment independent distributions are obtained at the
                      parton level.The ratio between the cross sections for
                      $\mathrm{t\bar{t}\gamma}$ and $\mathrm{t\bar{t}}$ is
                      measured for the first time at the LHC, inclusively and
                      differentially. Additionally, the top quark charge asymmetry
                      is measured in $\mathrm{t\bar{t}\gamma}$ events.The results
                      are obtained using maximum likelihood fits which directly
                      account for and constrain backgrounds and systematic
                      uncertainties. The results are compared to theory
                      predictions. No significant deviations from standard model
                      predictions are observed.Using a fraction of the same data,
                      collected in 2017, a search for central exclusive production
                      of $\mathrm{t\bar{t}}$, where the protons remain intact and
                      are measured in the Precision Proton Spectrometer, is also
                      presented. An upper limit for the cross section of this
                      process is obtained.},
      cin          = {CMS},
      cid          = {I:(DE-H253)CMS-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      VH-NG-1302 - Ultimate precision measurements and search for
                      new phenomena in processes with top quarks and a Z boson
                      with the CMS experiment at the LHC $(2018_VH-NG-1302)$},
      pid          = {G:(DE-HGF)POF4-611 / $G:(DE-HGF)2018_VH-NG-1302$},
      experiment   = {EXP:(DE-H253)LHC-Exp-CMS-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2023-07215},
      url          = {https://bib-pubdb1.desy.de/record/599191},
}