| 001 | 641372 | ||
| 005 | 20251205222051.0 | ||
| 024 | 7 | _ | |a GonzalezRodrigues:2025grt |2 INSPIRETeX |
| 024 | 7 | _ | |a inspire:2970481 |2 inspire |
| 024 | 7 | _ | |a urn:nbn:de:gbv:18-ediss-130726 |2 URN |
| 024 | 7 | _ | |a 10.3204/PUBDB-2025-05033 |2 datacite_doi |
| 037 | _ | _ | |a PUBDB-2025-05033 |
| 041 | _ | _ | |a English |
| 100 | 1 | _ | |a Gonzalez Rodrigues, Marcus |0 P:(DE-H253)PIP1099967 |b 0 |e Corresponding author |g male |
| 245 | _ | _ | |a Search 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 |f 2022-01-21 - 2022-07-25 |
| 260 | _ | _ | |c 2025 |
| 300 | _ | _ | |a 188 |
| 336 | 7 | _ | |a Output Types/Dissertation |2 DataCite |
| 336 | 7 | _ | |a DISSERTATION |2 ORCID |
| 336 | 7 | _ | |a PHDTHESIS |2 BibTeX |
| 336 | 7 | _ | |a Thesis |0 2 |2 EndNote |
| 336 | 7 | _ | |a Dissertation / PhD Thesis |b phd |m phd |0 PUB:(DE-HGF)11 |s 1764945340_3032996 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a doctoralThesis |2 DRIVER |
| 502 | _ | _ | |a Dissertation, University of Hamburg, 2025 |c University of Hamburg |b Dissertation |d 2025 |
| 520 | _ | _ | |a A 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. |
| 536 | _ | _ | |a 611 - Fundamental Particles and Forces (POF4-611) |0 G:(DE-HGF)POF4-611 |c POF4-611 |f POF IV |x 0 |
| 588 | _ | _ | |a Dataset connected to INSPIRE |
| 650 | _ | 7 | |a 530: Physik |2 autogen |
| 693 | _ | _ | |a LHC |e LHC: ATLAS |1 EXP:(DE-588)4398783-7 |0 EXP:(DE-H253)LHC-Exp-ATLAS-20150101 |5 EXP:(DE-H253)LHC-Exp-ATLAS-20150101 |x 0 |
| 700 | 1 | _ | |a Gallo-Voss, Elisabetta |0 P:(DE-H253)PIP1003350 |b 1 |e Thesis advisor |
| 700 | 1 | _ | |a Behr, Janna Katharina |0 P:(DE-HGF)0 |b 2 |e Thesis advisor |
| 856 | 4 | _ | |y OpenAccess |u https://bib-pubdb1.desy.de/record/641372/files/mythesis_publication.pdf |
| 856 | 4 | _ | |y OpenAccess |x pdfa |u https://bib-pubdb1.desy.de/record/641372/files/mythesis_publication.pdf?subformat=pdfa |
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| 910 | 1 | _ | |a Deutsches Elektronen-Synchrotron |0 I:(DE-588b)2008985-5 |k DESY |b 0 |6 P:(DE-H253)PIP1099967 |
| 910 | 1 | _ | |a Deutsches Elektronen-Synchrotron |0 I:(DE-588b)2008985-5 |k DESY |b 1 |6 P:(DE-H253)PIP1003350 |
| 913 | 1 | _ | |a DE-HGF |b Forschungsbereich Materie |l Matter and the Universe |1 G:(DE-HGF)POF4-610 |0 G:(DE-HGF)POF4-611 |3 G:(DE-HGF)POF4 |2 G:(DE-HGF)POF4-600 |4 G:(DE-HGF)POF |v Fundamental Particles and Forces |x 0 |
| 914 | 1 | _ | |y 2025 |
| 915 | _ | _ | |a OpenAccess |0 StatID:(DE-HGF)0510 |2 StatID |
| 915 | _ | _ | |a Creative Commons Attribution CC BY 4.0 |0 LIC:(DE-HGF)CCBY4 |2 HGFVOC |
| 920 | _ | _ | |l yes |
| 920 | 1 | _ | |0 I:(DE-H253)ATLAS-20120731 |k ATLAS |l LHC/ATLAS Experiment |x 0 |
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| 980 | _ | _ | |a UNRESTRICTED |
| 980 | _ | _ | |a I:(DE-H253)ATLAS-20120731 |
| 980 | 1 | _ | |a FullTexts |
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