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000641372 005__ 20251205222051.0
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000641372 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-05033
000641372 037__ $$aPUBDB-2025-05033
000641372 041__ $$aEnglish
000641372 1001_ $$0P:(DE-H253)PIP1099967$$aGonzalez Rodrigues, Marcus$$b0$$eCorresponding author$$gmale
000641372 245__ $$aSearch for the production of a pair of highly Lorentz-boosted Higgs bosons via vector-boson fusion in final states with four bottom quarks with the ATLAS experiment$$f2022-01-21 - 2022-07-25
000641372 260__ $$c2025
000641372 300__ $$a188
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000641372 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1764945340_3032996
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000641372 502__ $$aDissertation, University of Hamburg, 2025$$bDissertation$$cUniversity of Hamburg$$d2025
000641372 520__ $$aA search for the production of a pair of Higgs bosons ($HH$) via vector-boson fusion (VBF) in the Lorentz-boosted kinematic regime with subsequent decay of the Higgs bosons into four bottom quarks is presented. The analysis is based on 140~fb$^{-1}$ of proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider (LHC), at a center-of-mass energy of $\sqrt{s} = 13$~TeV. The results were interpreted in terms of both non-resonant and resonant production of Higgs-boson pairs. Non-resonant VBF $HH$ production is predicted by the Standard Model (SM); the production cross-section is, however, significantly enhanced for anomalous, non-SM values for the trilinear Higgs-boson self-coupling and the quartic coupling between two Higgs bosons and two vector bosons, parametrised as $\kappa_{\l}$ and $\kappa_{2V}$, respectively. Resonant VBF $HH$ production is predicted only by extensions of the SM. In this thesis, the resonant $HH$ production via the decay of a new heavy scalar particle originating from the vector-boson scattering was considered. No significant deviation of the data from the expected background was observed. Hence, in the non-resonant search, limits on the $\kappa_{2V}$ and $\kappa_{\l}$ couplings were set at $95\%$ confidence level. In the resonant search, upper limits on the signal cross-section were derived for intermediate masses ranging from 1.0~TeV to 5.0~TeV under the assumptions of a narrow- and broad-resonance widths. In the model-dependent broad-width scenario, a composite Higgs benchmark has been considered. In addition to these results, which have been published in 2024, the relevant details of a successive on-going ATLAS analysis using additionally data collected in 2022 and 2023 at $\sqrt{s} = 13.6$~TeV and using more modern tools to identify the $H \to b\bar{b}$ decays is discussed here. Finally, a proof-of-principle study using a transformer-based machine-learning algorithm to discriminate signal from background events in triple Higgs-boson searches is also shown in this thesis. The even rarer production of three Higgs bosons has been gaining significant interest since it provides unique access to the quartic Higgs-boson self-coupling.
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000641372 693__ $$0EXP:(DE-H253)LHC-Exp-ATLAS-20150101$$1EXP:(DE-588)4398783-7$$5EXP:(DE-H253)LHC-Exp-ATLAS-20150101$$aLHC$$eLHC: ATLAS$$x0
000641372 7001_ $$0P:(DE-H253)PIP1003350$$aGallo-Voss, Elisabetta$$b1$$eThesis advisor
000641372 7001_ $$0P:(DE-HGF)0$$aBehr, Janna Katharina$$b2$$eThesis advisor
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000641372 9141_ $$y2025
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