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000641370 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-05031
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000641370 041__ $$aEnglish
000641370 1001_ $$0P:(DE-H253)PIP1099044$$aKuk, Rebecca Olga von$$b0$$eCorresponding author$$gfemale$$udesy
000641370 245__ $$aHeavy-quark Effects in Factorization and Resummation$$f2021-11-01 - 2025-08-02
000641370 260__ $$c2025
000641370 300__ $$a210
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000641370 502__ $$aDissertation, UHH-Hamburg, 2025$$bDissertation$$cUHH-Hamburg$$d2025
000641370 520__ $$aIn 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.
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000641370 650_7 $$2autogen$$a530: Physik
000641370 650_7 $$2autogen$$a33.10: Theoretische Physik: Allgemeines
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000641370 7001_ $$0P:(DE-H253)PIP1015356$$aTackmann, Frank$$b1$$eThesis advisor
000641370 7001_ $$0P:(DE-H253)PIP1011115$$aMoortgat-Pick, Gudrid$$b2$$eThesis advisor
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000641370 9141_ $$y2025
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