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@PHDTHESIS{Kovalchuk:401937,
      author       = {Kovalchuk, Nataliia},
      othercontributors = {Schleper, Peter and Gallo-Voss, Elisabetta},
      title        = {{T}op quark mass measurement and color effects at the
                      {LHC}},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2018-01620, DESY-THESIS-2018-007},
      series       = {DESY-THESIS},
      pages        = {279},
      year         = {2018},
      note         = {Dissertation, Universität Hamburg, 2018},
      abstract     = {The top quark, the heaviest fundamental particle discovered
                      to date, is one of the most peculiar particles that were
                      discovered so far. It plays a crucial role in consistency
                      checks of the Standard Model and in searches for new
                      physics, e.g., supersymmetry, composite Higgs, and many
                      other exotic models. In this thesis, an important property
                      of the top quark is measured: the mass. This analysis is
                      based on the data recorded at a center-of-mass energy of 13
                      TeV in 2016 with the CMS detector at the CERN LHC, and
                      corresponds to an integrated luminosity of 35.9 fb$^{-1}$.
                      The mass of the top quark is measured using the top quark
                      pair event candidate, which corresponds to events with one
                      muon or electron and at least four jets. The corresponding
                      decay products are used in a kinematic fit to perform the
                      jet quark assignment, increase the fraction of correctly
                      reconstructed top quarks and to improve the mass resolution.
                      Using the ideogram method the top quark mass is measured
                      simultaneously with the jet scale factor (JSF), constrained
                      by the jets arising from the W boson decay. The estimated
                      result is calibrated with samples simulated with a
                      next-to-leading order matrix element generator matched to
                      the parton shower. The top quark mass is measured to be
                      $m_{t} = 172.25 \pm0.08 \mbox{ (stat+JSF)}\pm0.62\mbox{
                      (syst) GeV}$. The results are tested for possible kinematic
                      dependence by performing measurements of the top quark mass
                      in different phase space regions.The residual
                      data-to-simulation calibration of the energy of the jets is
                      also estimated from dijet events with data collected at
                      center-of-mass energy of 13 TeV in 2015 with the CMS
                      detector corresponding to an integrated luminosity of 2.1
                      fb$^{-1}$. The corrections are performed using selected
                      back-to-back dijet events by the MPF and dijet balance
                      methods and are found to differ from unity by less then 3 \%
                      in the barrel region and up to 17 \% in the endcap and
                      forward regions of the detector. This result was used in the
                      top mass measurement.Additionally, a tune for a possible
                      color reconnection between the different multiple parton
                      interaction systems is performed for the recently available
                      QCD-inspired model. The predictions obtained by this tune
                      are able to describe underlying event observables as well as
                      measured charged particle multiplicities. The results are
                      used for a more reliable estimation of the corresponding
                      systematic uncertainty.},
      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-2018-01620},
      url          = {https://bib-pubdb1.desy.de/record/401937},
}