DISSERTATIONEN - MASTERARBEITEN - BACHELORARBEITEN 2021



OpenAccess [PUBDB-2021-01412] Book/Bachelor Thesis
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Machbarkeitsstudie zur modularen Programmierung eines 6-Achsen-Justierroboters
[DESY-THESIS-2021-003]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 268 pp. () [10.3204/PUBDB-2021-01412] = Bachelorarbeit, Hochschule RheinMain, 2020  GO
In this bachelor thesis a feasibility study is carried out about assembling and programming a control unit for the 6 axis positioning robot EASy P1 series. The positioning robots will be used at DESY Research Center to adjust accelerator components. [...]
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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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OpenAccess [PUBDB-2021-01074] Book/Master Thesis
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Optimizing the Machine Learning techniques in the $\it H$ $\rightarrow$ $\tau \tau$ analysis with CMS data
[DESY-THESIS-2021-001]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 82 pp. () [10.3204/PUBDB-2021-01074] = Masterarbeit, Universität Hamburg, 2021  GO
This work is dedicated to optimize and improve the machine learning techniques usedin the $\it H$ $\rightarrow$ $\tau \tau$ analysis in the channel where the tau leptons decay to a e $\mu$ pair. The measurement is performed using data, corresponding to an integrated luminosity of 59.7 fb$^{-1}$, collected by the CMS experiment at a center-of-mass energy of 13 TeV during 2018. [...]
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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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OpenAccess [PUBDB-2020-05030] Book/Dissertation / PhD Thesis
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Measurement of Electron Parameters using Thomson Scattering
[DESY-THESIS-2021-009]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 158 pp. () [10.3204/PUBDB-2020-05030] = Dissertation, Universtät Hamburg, 2020  GO
Laser-plasma acceleration (LPA) [1] oers acceleration gradients several orders of magnitudehigher than in conventional radio-frequency accelerators, enabling the accelerationof electrons to hundreds of MeV in just a few millimetres. These small-scale acceleratorsand in particular X-rays generated from LPA electron beams could potentially be used inmaterial science or medicine [2]. [...]
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OpenAccess [PUBDB-2021-02843] Book/Master Thesis
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Entwicklung eines kinematischen Modells sowie einerSteuerung für eine 6-Achs-Kinematik
[DESY-THESIS-2021-011]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 131 pp. () [10.3204/PUBDB-2021-02843] = Masterarbeit, Beuth Hochschule für Technik Berlin, 2021  GO
Der Betrieb des Teilchenbeschleunigers bei DESY in Hamburg stellt spezielle Anforderungenan Positioniergeräte für Sicherheits- und Analysemechanismen. AlsKonsequenz wurden verschiedene, auf diese speziellen Anforderungen optimierte,6-Achs-Kinematiken (vgl [...]
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OpenAccess [PUBDB-2021-03550] Book/Dissertation / PhD Thesis
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Measurement of the CP properties of the Higgs boson in its decays to τ leptons with the CMS experiment
[DESY-THESIS-2021-015]
Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 301 pp. () [10.3204/PUBDB-2021-03550] = Dissertation, Universität Hamburg, 2021  GO
The discovery of the Higgs boson in 2012 by the CMS and ATLAS collaborations marked the start of the exploration of the Higgs sector of particle physics. This thesis explores one of these measurements: the study of the CP properties of the Yukawa coupling between the Higgs and the τ lepton. [...]
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[PUBDB-2021-03748] Dissertation / PhD Thesis

Understanding Nucleation and Growth of Crystalline Germanium Through In-Situ Studies of the EC-LSS Technique
124 pp. () = Dissertation, University of Michigan, 2021
This thesis describes general strategies to directly study the electrochemical Liquid Liquid Solid (ec-LLS) growth process using a suite of in-situ characterization techniques. The central goal of this work is to directly observe the ec-LLS process as it occurs to increase our understanding of the fundamental aspects of the technique.The first portion of this thesis details a general methodology for the study of electron beam stimulated ec-LLS nanowire growth via liquid cell transmission electron microscopy (LC-TEM). [...]
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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[PUBDB-2021-02687] Bachelor Thesis
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Commissioning of a Calibration Device for Second Sound Based Quench Detection and Reconstruction Analysis
49 pp. () = Bachelorarbeit, University of Hamburg, 2021
An important part of research and development (R&D) in the field of superconducting radiofrequency cavities is quench detection since these local breakdowns of superconductivity primarilylimit the cavity performance. Due to the detection of second sound waves propagating inliquid helium, the localization of quench spots on superconducting radio frequency cavities no longer requires the laborious attachment of many temperature sensors. [...]
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[PUBDB-2021-03644] Bachelor Thesis
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Comparison of laser and X-ray beam induced current measurements of a crystalline Si solar cell
48 pp. () = Bachelorarbeit, Universität Hamburg, 2021
X­ray beam induced current (XBIC) and laser beam induced current (LBIC) measurements en­able the point by point correlation of solar cell performance with complementary measurementmodalities in scanning microscopy.In this Bachelor’s thesis a complete mini­module with a mono­crystalline silicon solar cell in­cluding housing was measured using a 28keV X­ray beam and a 532nm laser beam as a probe.In particular, the influence of an Ag finger front contact on the multi­model signals induced bythe two measurement probes was compared.The hard X­ray photons were nano­focused and the energy was chosen that the beam can pene­trate the complete module and excite the AgK electrons in the Ag fingers. The strong absorptanceof the Ag fingers can be clearly seen in the X­ray transmittance measurements. [...]
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[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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OpenAccess [PUBDB-2021-03193] Dissertation / PhD Thesis
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The Magellanic Clouds in VHE gamma-rays as seen by H.E.S.S.
Universität Potsdam 182 pp. () [10.3204/PUBDB-2021-03193] = Dissertation, Universität Potsdam, 2020  GO
The field of γ-ray astronomy opened a new window into the non-thermal universe that allows studying the acceleration sites of cosmic rays and the role of cosmic rays on evolutionary processes in galaxies. The detection of almost one hundred Galactic very-high-energy (VHE: 0.1−100TeV) γ-ray sources in the Milky Way demonstrates that particle acceleration up to tens of TeV energies is a common phenomenon. [...]
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[PUBDB-2021-01111] Dissertation / PhD Thesis
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Supramolecular Chemistry and Halogenation Reactions of Pentaphosphaferrocenes
Regensburg : University of Regensburg 305 pp. () = Dissertation, University of Regensburg, 2021
[PUBDB-2021-03645] Bachelor Thesis
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Lock-in Amplification for Laser and X-ray Beam Induced Current Measurements of Solar Cells
68 pp. () = Bachelorarbeit, Universität Hamburg, 2021
Laser beam induce current (LBIC) and X­ray beam induced current (XBIC) are effective tech­niques for mapping the spatial electrical performance of solar cells. Conducting precise currentmeasurements up to the femto­Ampere range is challenging and susceptible to noise [...]
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OpenAccess [PUBDB-2021-01568] Book/Dissertation / PhD Thesis
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A high resolution Silicon Strip Telescope and its application at the DESY II TestBeam Facility
[DESY-THESIS-2021-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 301 pp. () [10.3204/PUBDB-2021-01568] = Dissertation, Universität Hamburg, 2020  GO
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[PUBDB-2021-01385] Master Thesis
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Shower shape conversion between electrons and photons in Belle II using Cycle Generative Adversarial Network
DESY-Hamburg : DESY 87 pp. () = Masterarbeit, University of Hamburg, 2021
Simulation is essential to high-energy physics. The application of simulation ranges from development of software to the analysis of physical processes. [...]
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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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[PUBDB-2021-03435] Bachelor Thesis
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Study of Interferences Between Resonant Heavy-Higgs-Boson Production and Top-Antitop-Quark Production in the nStandard Model
112 pp. () = Bachelorarbeit, University of Hamburg, 2021
Recent discoveries in the area of cosmology, like the proposition of dark matter, haveindicated that there may be additional particles beyond the Standard Model which mayexplain the phenomena of Dark Matter in the Universe. Among many suggestions ofwhat Dark Matter actually is, there are models such as two-Higgs doublet Models thatpredict the existence of additional scalar (H) or pseudoscalar (A) Higgs bosons whichcould function as mediators between Standard Model and Dark Matter particles. [...]
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OpenAccess [PUBDB-2020-03616] Book/Dissertation / PhD Thesis
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Factorization and Resummation for Precision Physics at the LHC
[DESY-THESIS-2021-007]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 409 pages; 81 figures and illustrations; 10 tables () [10.3204/PUBDB-2020-03616] = Dissertation, Universität Hamburg, 2020  GO
The LHC precision program aims to more thoroughly test the Standard Model of particle physics than ever before. Precise theory predictions for realistic experimental observables are a key ingredient in this program. [...]
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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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OpenAccess [PUBDB-2021-03168] Dissertation / PhD Thesis
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Search for the production of a Higgs boson decaying into a pair of bottom quarks in association with a pair of top quarks at 13 TeV with the ATLAS detector
Humboldt-Universität zu Berlin 181 pp. () [10.18452/23027] = Dissertation, Humboldt Universität zu Berlin, 2021  GO
Die Entdeckung des Higgs-Bosons im Jahr 2012 bestätigt das Standardmodell als die erfolgreichste Theorie, die die grundlegenden Wechselwirkungen von Elementarteilchen beschreibt. Eine der wichtigen Eigenschaften des Higgs-Bosons ist seine Yukawa-Kopplung an das Top-Quark, die aufgrund der hohen Masse des Quarks im Standardmodell am stärksten ist. [...]
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OpenAccess [PUBDB-2021-03167] Dissertation / PhD Thesis
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QCD analysis and measurement of $W$ boson production in association with jets at the ATLAS detector
243 pp. () [10.3204/PUBDB-2021-03167] = Dissertation, University of Oxford, 2021  GO
The Standard Model of particle physics stands as one of the triumphs of the20th and 21st century so far. Colliders around the world have been built for thepurpose of pushing this theory to its limit, and have consistently found theirmeasurements to be well described. [...]
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OpenAccess [PUBDB-2021-03765] Book/Dissertation / PhD Thesis
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A Glance into the Future of Particle Physics with Effective Field Theories
[DESY-THESIS-2021-016]
Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 193 pp. () [10.3204/PUBDB-2021-03765] = Dissertation, Humboldt-Universität zu Berlin, 2021  GO
The results obtained at the LHC agree well with the predictions of the Standard Model of particle physics (SM). However, the need for Beyond the Standard Model (BSM) physics remains. [...]
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OpenAccess [PUBDB-2020-05210] Dissertation / PhD Thesis
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Control of airborne nanoparticles
93 pp. () [10.3204/PUBDB-2020-05210] = Dissertation, University of Hamburg, 2020  GO
Single-particle diffractive imaging at x-ray free-electron lasers is a promising technique for reconstructing the three dimensional structure of biomolecules such as proteins or viruses, avoiding drawbacks of conventional diffractive imaging methods, such as the need of crystalline sample. In order to achieve atomic resolution a huge amount of diffraction patterns of identical particles, ideally in gas phase are needed. [...]
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[PUBDB-2021-03538] Book/Dissertation / PhD Thesis
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Automation of NLO QCD Corrections and the Application to $N$-Jet Processes at Lepton Colliders
[DESY-THESIS-2021-014]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS-2021-014 229 pp. () = Dissertation, Universität Hamburg, 2021
Despite strong indications for physics beyond the Standard Model (BSM), no definitedirect detection of new physics has been made at the Large Hadron Collider (LHC)yet. Therefore, high-precision particle physics becomes ever more important in orderto probe the Standard Model (SM) parameters for any deviation from theoreticalpredictions.This requires increasing experimental precision and theoretical accuracy. [...]
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OpenAccess [PUBDB-2021-03289] Book/Dissertation / PhD Thesis
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Phenomenology of $t\bar{t}H$ Production with Top Quark Running Mass and the Differential Cross-Section Measurement of $t\bar{t}+b$-jets Production in the Dilepton Channel at $\sqrt{s}=13$ TeV with the CMS Experiment
[DESY-THESIS-2021-013]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 456 pp. () [10.3204/PUBDB-2021-03289] = Dissertation, Universität Hamburg, 2021  GO
A phenomenology study and a differential cross-section measurement are presented in this thesis.For the phenomenology study, the differential cross-sections of the top quark pair production in association with a Higgs boson ($t\bar{t}H$) are calculated with the top quark running mass in the $\overline{MS}$ renormalization scheme for the first time.The cross-sections and their scale uncertainties are calculated as a function of the kinematic variables of the top quarks, the Higgs boson, the top quark anti-quark system, and the invariant mass of the $t\bar{t}H$ system.Subsequently, the results are compared to calculations in the pole mass scheme.Overall, the scale uncertainties in the calculations using the $\overline{MS}$ scheme are found to be slightly reduced compared to the pole mass scheme.The second study presented in this thesis is the total and differential cross-section measurements of the top quark pair production with additional jets originating from the hadronization of bottom quarks ($t\bar{t}+b-\text{jets}$ ) in the dilepton decay channel of the $t\bar{t}$ system at the center-of-mass energy $\sqrt{s}=13$ TeV.The analysis is performed using data recorded by the CMS detector in the Run II period of the LHC during the years 2016, 2017, and 2018, corresponding to an integrated luminosity of $137.19 ~\text{fb}^{-1}$.The measurement of the total production cross-section of the $t\bar{t}+b-\text{jets}$ process is the most precise to date and the value is found to be $\sigma_{t\bar{t}+b-\text{jets}} = 4.91\pm0.08(\text{stat})^{+0.47}_{-0.43}(\text{sys})$ pb.The absolute and normalized differential cross-sections are measured as a function of transverse momentum, the absolute value of the pseudo-rapidity, the invariant mass, and the distance of the additional $b$-jets.For the first time, the differential distributions of the sub-leading additional $b$-jet are measured at $\sqrt{s}=13$ TeV.Additionally, two top quark definitions are used to define the additional $b$-jets at the truth level: a parton-based and a purely particle-based approach.The results are compared to the state-of-the-art Monte Carlo simulations of the $t\bar{t}+\text{jets}$ and $t\bar{t}+b-\text{jets}$ processes.Overall, all simulations are found to describe the measured normalized distributions similarly well.However, the absolute differential cross-sections are best described by the Powheg+Openloops+Pythia8 and the PowHel+Pythia8 (5FNS) $t\bar{t}+b-\text{jets}$ simulations..
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[PUBDB-2021-00779] Master Thesis
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Production of coherent 150 nm light via 7$^{\text{th}}$ harmonic generation for nuclear spectroscopy applications
Hamburg 87 pp. () = Masterarbeit, University of Hamburg, 2021
The $7^{\text{th}}$ harmonic generation of $1030\,\text{nm}$ light constitutes a rather unexplored regime within the field of harmonic generation. The resulting coherent light with a wavelength of roughly $150\,\text{nm}$ can be utilized for a wide range of novel applications, in particular the recently emerging field of nuclear spectroscopy of the Thorium-229 isotope nucleus. [...]
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[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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[PUBDB-2021-03808] Bachelor Thesis
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Suche nach pseudoskalaren Dunkle-Materie-Mediator-Teilchen in Signaturen mit zwei Bottom-Quarks, einem leptonisch zerfallenden 𝒁𝟎- Boson und fehlender Transversalenergie
72 pp. () = Bachelorarbeit, University of Hamburg, 2021
Obwohl etwa 85% der gesamten Materie im Universum aus Dunkler Materie besteht (vgl.Eidemüller 2017: 5), ist ihre Natur bisher noch ungeklärt. Lediglich die Gravitationswirkung, die Dunkle Materie auf sichtbare Materie zu hab en scheint, ist erwiesen. [...]
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OpenAccess [PUBDB-2021-00248] Book/Dissertation / PhD Thesis
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Higher Order Mode-based Beam and Cavity Diagnostics in 1.3 GHz Superconducting Cavities at FLASH
[DESY-THESIS-2020-027]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 162 pp. () [10.3204/PUBDB-2021-00248] = Dissertation, University of Science and Technology of China, 2020  GO
FLASH (Free Electron Laser in Hamburg) is a linac based SASE (Self-AmplifiedSpontaneous Emission) FEL (Free Electron Laser) facility generating high qualityEUV (Extreme Ultra-Violet) to soft X-ray radiation pulses. TESLA (TeV EnergySuperconducting Linear Accelerator) 1.3 GHz cavities are used for the accelerationof the electron bunches. [...]
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[PUBDB-2021-02736] Master Thesis
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Neural Network based Pulse Shape Analysis with the Belle II Electromagnetic Calorimeter
Hamburg 89 pp. () = Masterarbeit, University of Hamburg, 2021
The Belle II experiment, located at the SuperKEKB e+e- collider inJapan, uses pulse shape analysis techniques to distinguish electromagneticallyand hadronically interacting particles within the CsI(Tl) electromagneticcalorimeter. The pulse shapes from the particle-dependent scintillationresponse are nominally analysed with a multi-template oine t to measurethe fraction of scintillation emission produced by hadrons [...]
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