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@PHDTHESIS{Kuk:641370,
      author       = {Kuk, Rebecca Olga von},
      othercontributors = {Tackmann, Frank and Moortgat-Pick, Gudrid},
      title        = {{H}eavy-quark {E}ffects in {F}actorization and
                      {R}esummation},
      school       = {UHH-Hamburg},
      type         = {Dissertation},
      reportid     = {PUBDB-2025-05031},
      pages        = {210},
      year         = {2025},
      note         = {Dissertation, UHH-Hamburg, 2025},
      abstract     = {In this thesis, we study different aspects of heavy-quark
                      effects in factorization and resummation using the methods
                      of effective field theories. As the quark masses are much
                      lighter than the hard scale of processes at the LHC, they
                      are considered subleading and usually neglected. However,
                      with high-precision measurements from the experiments at the
                      LHC more precise theory predictions are needed and
                      quark-mass effects can no longer be ignored. In this thesis
                      we study two different aspects of heavy-quark effects.One
                      part of this thesis focuses on quark-mass effects in the
                      Higgs transverse momentum spectrum. This kinematic
                      distribution is of particular interest as its shape can be
                      used extract the quark Yukawa couplings appearing in Higgs
                      production processes. We present a new state-of-the-art
                      prediction for quark initiated Higgs production where we
                      consider bottom, charm and strange quarks in the initial
                      state. We provide results at three-loop order in resummed
                      perturbation theory and match this prediction to an
                      approximate next-to-next-to-next-to-leading order
                      prediction.Moreover, we study the resummation of transverse
                      variables in the Monte Carlo event generator GENEVA using
                      one-jettiness and the transverse momentum as resolution
                      variables. This presents a first step towards an NNLO
                      prediction matched to a parton shower for this
                      process.Further, we study bottom-mass effects in the
                      transverse momentum spectrum for the gluon fusion process.
                      In gluon fusion, the dominant contribution comes from a
                      massive top-quark loop, with contributions from other quarks
                      often neglected. However, to fully exploit high-precision
                      measurements at the LHC, it becomes essential to account for
                      subleading effects. In particular, the contribution from the
                      bottom quark can no longer be ignored. The interference
                      between the top- and bottom-quark contributions plays a
                      significant role and is crucial for measuring the
                      bottom-Yukawa coupling in Higgs production. So far these
                      effects have only been studied for the form factor where we
                      have two scales, the Higgs mass and the bottom-quark mass.
                      The measurement of the transverse momentum introduces a
                      third scale to the problem which makes the factorization
                      much more subtle: the bottom and the Higgs mass of course
                      still have the same scaling as in the form factor
                      calculation but the transverse can have different scalings.
                      Hence, we have to consider different kinematic regimes and
                      write down a factorization theorem for each of them. In the
                      second part, we consider transverse momentum dependent (TMD)
                      fragmentation functions (FFs) for heavy quarks. The
                      heavy-quark mass provides a perturbative scale in the
                      otherwise nonperturbative dynamics of the fragmentation
                      process. We demonstrate that applying boosted Heavy-Quark
                      Effective Theory to TMD FFs gives rise to novel, universal
                      matrix elements describing the nonperturbative transverse
                      dynamics of light QCD degrees of freedom in the presence of
                      a heavy quark.We further calculate all TMD parton
                      distribution functions for the production of heavy quarks
                      from polarized gluons within the nucleon.We use these
                      results to make phenomenological predictions for cross
                      sections in electron positron collisions and semi-inclusive
                      deep inelastic scattering, which are relevant for existing
                      B-factories and the future EIC, respectively.Additionally we
                      calculate all TMD FFs involving heavy quarks and the
                      associated TMD matrix element in heavy-quark effective
                      theory to next-to-leading order in the strong coupling.},
      keywords     = {530: Physik (autogen) / 33.10: Theoretische Physik:
                      Allgemeines (autogen)},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) /
                      COLORFREE - High-Precision Global Analysis of Color-Free LHC
                      Processes at Small Recoil (101002090)},
      pid          = {G:(DE-HGF)POF4-611 / G:(EU-Grant)101002090},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:18-ediss-128233},
      doi          = {10.3204/PUBDB-2025-05031},
      url          = {https://bib-pubdb1.desy.de/record/641370},
}