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@PHDTHESIS{Paasch:626055,
      author       = {Paasch, Alexander Maximilian},
      othercontributors = {Haller, Johannes},
      title        = {{D}etermination of the {J}et {E}nergy {R}esolution and
                      {M}easurements of {J}et {S}ubstructure and the {T}op {Q}uark
                      {M}ass in {D}ecays of {B}oosted {T}op {Q}uarks at {CMS}},
      school       = {University of Hamburg},
      type         = {Dissertation},
      reportid     = {PUBDB-2025-01277},
      pages        = {190},
      year         = {2024},
      note         = {Dissertation, University of Hamburg, 2024},
      abstract     = {This thesis presents two analyses using data recorded by
                      the CMS detector in proton-proton collisions at the
                      LHC.First, a determination of the jet transverse momentum
                      resolution scale factors is performed, followed by the
                      measurement of the jet mass in hadronic decays of boosted
                      top quarks and by an extraction of the top quark mass.The
                      first analysis determines the jet transverse momentum
                      resolution scale factors for data collected during the LHC
                      Run 2 and Run 3 data-taking periods.The width of the jet
                      energy response is calibrated in simulation to match the
                      width in data, exploiting the transverse momentum balance in
                      QCD dijet events.In this thesis, this method has been
                      extended to cover a jet transverse momentum from 200 GeV to
                      2000 GeV.A modified correction method for additional jet
                      activity is introduced, refining the uncertainty treatment
                      and the reliability of the calibration.The compatibility of
                      simulation to data is studied, particularly in low
                      transverse momentum ranges which are constrained due to the
                      additional jet activity.The final calibration for data
                      collected at a center-of-mass energy of 13 TeV has been
                      performed, covering the years 2016, 2017, and 2018,
                      corresponding to an integrated luminosity of 138
                      $fb^-1.Moreover,$ the first calibrations for data collected
                      at 13.6 TeV is presented for 2022 and 2023 corresponding to
                      62 $fb^-1.The$ second analysis presents the measurement of
                      the differential top quark pair production cross section as
                      a function of the jet mass in decays of boosted top quarks,
                      using data collected at 13 TeV corresponding to 138
                      $fb^-1.At$ high momenta, the decay products of top quarks
                      are highly Lorentz boosted and can be reconstructed within a
                      single jet, which require a detailed understanding of the
                      jet substructure.The reconstruction of the hadronic top
                      quark decay in a single jet provides the opportunity to
                      explore new energy regimes.Moreover, the jet mass
                      distribution can be compared to analytic calculations,
                      allowing for the extraction of the top quark mass in a
                      well-defined mass scheme.In this work, the focus is set on
                      the dominant uncertainties of an earlier analysis result,
                      the calibration of the jet mass scale and the modeling of
                      the final state radiation.The uncertainty of the jet mass
                      scale is constrained by calibrating the jet mass scale to
                      the reconstructed W boson mass.A refined modeling of the
                      final state radiation is introduced, based on the
                      N-subjettiness.This reduces the uncertainty of the jet mass
                      scale by a factor of three and minimizes the final state
                      radiation modeling uncertainty, making it a negligible
                      source of uncertainties.The jet mass is unfolded to particle
                      level and used to extract the top quark mass with (173.06 +-
                      0.84) GeV.},
      pnm          = {PHGS, VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {$G:(DE-HGF)2015_IFV-VH-GS-500$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:18-ediss-123622},
      url          = {https://bib-pubdb1.desy.de/record/626055},
}