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000634618 005__ 20250814212226.0
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000634618 041__ $$aEnglish
000634618 1001_ $$0P:(DE-H253)PIP1108485$$aRogner, Victor$$b0$$eCorresponding author$$gmale
000634618 245__ $$aOn Higher-Order Contributions to the Trilinear Higgs Self-Coupling in the SM and Beyond$$f2024-05-01 - 2025-07-24
000634618 260__ $$c2025
000634618 300__ $$a83
000634618 3367_ $$2DataCite$$aOutput Types/Supervised Student Publication
000634618 3367_ $$02$$2EndNote$$aThesis
000634618 3367_ $$2BibTeX$$aMASTERSTHESIS
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000634618 3367_ $$0PUB:(DE-HGF)19$$2PUB:(DE-HGF)$$aMaster Thesis$$bmaster$$mmaster$$s1755173757_2845487
000634618 3367_ $$2ORCID$$aSUPERVISED_STUDENT_PUBLICATION
000634618 502__ $$aMasterarbeit, University of Hamburg, 2025$$bMasterarbeit$$cUniversity of Hamburg$$d2025
000634618 520__ $$aWe present a precision computation of the trilinear Higgs boson self-coupling \(\lambda_{hhh}\) in the Standard Model (SM) and the Type-II Two-Higgs-Doublet-Model (\text{THDM}) in the alignment limit, both with vanishing external momenta for the vertex, employing a fully on-shell renormalization scheme. Our analysis includes all one-loop corrections and, for the first time to our knowledge, the dominant two-loop top- and bottom-Yukawa contributions of \(\mathcal{O}(N_c^2)\). Analytic results consisting of the leading contributions for a heavy top quark are also derived.We evaluate the results in both the \(\alpha\)- and \(G_F\)-parametrizations. In the SM, \(\lambda_{hhh}\) is reduced from its tree-level value of 187.3\,GeV (\(\alpha\)) and 190.7\,GeV (\(G_F\)) to 175.479\,GeV and 175.715\,GeV, respectively, when including the full one-loop and the two-loop top- and bottom-Yukawa corrections of \(\mathcal{O}(N_c^2)\).In the \text{THDM}, the phenomenologically viable parameter space is investigated. In the alignment limit, heavy scalar masses in the 600--1000\,GeV range can enhance \(\lambda_{hhh}\) substantially, with values up to \(\sim 980\)\,GeV being consistent with current constraints.We further analyze the sensitivity of \(\lambda_{hhh}\) to beyond-the-Standard-Model (BSM) effects by parametrizing deviations with respect to the one-loop contributions in the Standard Model. The current experimental bounds \(\kappa_\lambda \in [-1,\,7]\) allow sizeable modifications to the trilinear Higgs coupling, which is investigated with respect to the new two-loop contributions in the Standard Model.
000634618 536__ $$0G:(DE-HGF)POF4-611$$a611 - Fundamental Particles and Forces (POF4-611)$$cPOF4-611$$fPOF IV$$x0
000634618 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
000634618 7001_ $$0P:(DE-H253)PIP1010814$$aWeiglein, Georg$$b1$$eThesis advisor
000634618 8564_ $$uhttps://bib-pubdb1.desy.de/record/634618/files/Master_Thesis_J_Victor_K_Rogner.pdf$$yRestricted
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000634618 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1010814$$aDeutsches Elektronen-Synchrotron$$b1$$kDESY
000634618 9131_ $$0G:(DE-HGF)POF4-611$$1G:(DE-HGF)POF4-610$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMatter and the Universe$$vFundamental Particles and Forces$$x0
000634618 9141_ $$y2025
000634618 920__ $$lyes
000634618 9201_ $$0I:(DE-H253)T-20120731$$kT$$lTheorie-Gruppe$$x0
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