Ph.D. Theses

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2021-07-20
16:00
OpenAccess [PUBDB-2021-03020] Book/Dissertation / PhD Thesis
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Search for high-mass bosons of an extended Higgs sector in b quark final states using the 2017 data set of the CMS experiment
[DESY-THESIS-2021-012]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 249 pp. () [10.3204/PUBDB-2021-03020] = Dissertation, Universität Hamburg, 2021  GO
A search for heavy, neutral Higgs bosons produced in association with b quarks and decaying into a pair of b quarks is presented. It is based on LHC Run 2 data, produced at a center-of-mass energy of 13 TeV in pp collisions and collected by the CMS experiment in 2017, corresponding to an integrated luminosity of 36.02/fb.Several theories beyond the Standard Model predict additional Higgs bosons and, dependingon the specific model, the coupling to b quarks can be significantly enlarged. [...]
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2021-07-19
10:07
OpenAccess [PUBDB-2021-03004] Dissertation / PhD Thesis

Time-resolved imaging of laser-induced phase transitions in free silver nanoclusters
Universität Freiburg : Albert-Ludwigs-Universität Freiburg 137 pp. () [10.6094/UNIFR/175263] = Dissertation, Albert-Ludwigs-Universität Freiburg im Breisgau, 2020  GO
In this work, the challenge to further the fundamental understanding of nanoscale matter is tackled from the perspective of cluster science. More specifically the spatial transformation of gas phase silver nanoclusters during melting is investigated. [...]
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2021-06-29
11:58
OpenAccess [PUBDB-2021-02825] Dissertation / PhD Thesis
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Measurement of $W^+ W^−$ production cross section in proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Humboldt-Universität zu Berlin 111 pp. () [10.18452/19352] = Dissertation, Humbold Universität, 2018  GO
Diese Arbeit stellt eine Messung des $W^+ W^−$ Produktionswirkungsquerschnitts in pp Kollisionen bei einer Schwerpunktenergie von $\sqrt{s} = 13$ TeV vor. Der verwendete Datensatz wurde mit dem ATLAS Detektor im Jahr 2015 aufgezeichnet und entspricht einer integrierten Luminosität von 3,16 fb$^{-1}$ [...]
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2021-06-28
14:41
OpenAccess [PUBDB-2021-02808] Book/Dissertation / PhD Thesis
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Dark Sector Cosmologies: Evolution and Constraints
[DESY-THESIS-2021-010]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 179 pp. () [10.3204/PUBDB-2021-02808] = Dissertation, Universtät Hamburg, 2021  GO
Many models of dark matter place their dark matter candidate inside a broader dark sector with other particles and fields for theoretical and phenomenological reasons. The cosmological evolution of these dark sectors can differ significantly from standard scenarios, in particular due to their interplay with the Standard Model of particle physics. [...]
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2021-05-25
21:18
[PUBDB-2021-02439] Dissertation / PhD Thesis
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Kinetics and microstructural evolutions during the tempering of martensitic and nano-bainitic low alloyed steel : in situ experimental study and modelling
224 pp. () = Dissertation, Université de Lorraine, 2021
Nano-bainitic steels represent a new class of alloys, whose microstructure consists of nanostructured bainitic ferrite formed at low temperature with a high amount of retained austeniteleading to a high ductility and high tensile strength of the steel. Formation of nanobainite has been studied thoroughly in literature as well as tempering of nano-bainitic steels. [...]
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2021-04-30
15:15
[PUBDB-2021-02045] Dissertation / PhD Thesis
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Search for heavy Higgs bosons A/H decaying to a top-quark pair in pp collisions at \sqrt(s)=8 TeV with the ATLAS detector
Humboldt-Universität zu Berlin 159 pp. () [10.18452/22839] = Dissertation, Humboldt Universität zu Berlin, 2020  GO
In dieser Dissertation wird die Suche nach schweren neutralen pseudoskalaren A und skalaren H Higgs-Bosonen vorgestellt, die in gg-Fusionen erzeugt werden, und in ein Top-Antitop-Quark-Paar zerfallen. Gesucht wurde im vollständigen Datensatz von Proton–Proton-Kollisionen bei einer Schwerpunktsenergie von 8 TeV die vom ATLAS-Detektor am Large Hadron Collider aufgezeichnet wurde und einer integrierten Luminosität von 20.3 fb$^{−1}$ entspricht. [...]
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2021-04-26
10:43
OpenAccess [PUBDB-2021-01952] Book/Dissertation / PhD Thesis
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Time-resolved rheology on complex fluids
[DESY-THESIS-2021-006]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 86 pp. () [10.3204/PUBDB-2021-01952] = Dissertation, Universität Hamburg, 2021  GO
The aim of this work was to explore the potential of a combined rheology and X-ray scattering approach on complex fluids. Shear rates between 0.9·10$^5$ s$^{−1}$ and 5.6·10$^5$ s$^{−1}$, which are magnitudes higher than found in classical rheometry studies, were applied to a suspension of colloidal silica nanoparticles by a microfluidic jet device. [...]
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2021-04-12
16:35
OpenAccess [PUBDB-2021-01775] Dissertation / PhD Thesis
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Dissociation dynamics of size-selected water dimer
Hamburg : Staats- und Universitätsbibliothek Hamburg 129 pp. () [10.3204/PUBDB-2021-01775] = Dissertation, University of Hamburg, 2021  GO
Water is commonly said to be the matrix of life. It is built from water molecules, which are connected via hydrogen bonds. [...]
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2021-04-08
10:58
OpenAccess [PUBDB-2021-01683] Book/Dissertation / PhD Thesis
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Search for Dark Matter with machine learning techniques in leptonic final states and missing transverse energy at the CMS Experiment
[DESY-THESIS-21-005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 194 pp. () [10.3204/PUBDB-2021-01683] = Dissertation, RWTH Aachen Universität, 2021  GO
This thesis presents work for the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The two main subjects are a search for Dark Matter events in final states with one lepton within two supersymmetry (SUSY) models and studies on the performance of the Hadron Outer (HO) calorimeter as a support for the muon system and the muon trigger. [...]
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2021-03-30
09:52
OpenAccess [PUBDB-2021-01582] Dissertation / PhD Thesis
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Search for Standard Model Higgs bosons produced in association with top-quark pairs in ttH multilepton final states using the ATLAS detector at the LHC.
Humboldt-Universität zu Berlin 112 pp. () [10.18452/22550] = Dissertation, Humboldt-Universitat zu Berlin:, 2020  GO
Diese Arbeit beschreibt die Suche nach assoziierter Produktion eines Higgsbosons und eines Top-Quark Paares in Proton-Proton Kollisionen bei einer Schwerpunktsenergie von 13 TeV. Für diese Analyse wurden Ereignisse analysiert, die exakt zwei Leptonen mit gleichem Ladungsvorzeichen oder exakt drei Leptonen enthalten und daher auf die Higgs Zerfallsmoden in H->WW, H->ZZ und H->tautau sensitiv sind. [...]
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