Ph.D. Theses

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2025-07-17
13:52
[PUBDB-2025-02444] Dissertation / PhD Thesis
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τ -Lepton Lifetime Measurement andWorking Point Optimization for the PixelVertex Detector at Belle II
257 pp. () = Dissertation, University of Hamburg, 2025  GO
In the Standard Model of Particle Physics, all leptons have the same coupling strength tothe weak interaction. Comparing the theoretical model with experimental observations revealsa slight deviation in the electron branching fraction of τ -lepton decays. [...]
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2025-07-14
11:54
[PUBDB-2025-02377] Dissertation / PhD Thesis
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Measurement of Astrophysical Neutrino flavour composition with Twelve Years of IceCube Data
Humboldt-Universität zu Berlin 159 pp. () [10.18452/33426] = Dissertation, HU Berlin, 2025  GO
Kosmische Strahlung und hochenergetische Neutrinos stammen aus extremen astrophysikalischen Umgebungen, wo kosmische Strahlen mit Materie oder Photonen interagieren und Neutrinos erzeugen. Die auf der Erde beobachtete Flavour-Zusammensetzung liefert Einblicke in deren Ursprünge. [...]
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2025-07-10
11:33
[PUBDB-2025-02307] Book/Dissertation / PhD Thesis
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Aging Mechanisms of Lithium-Ion Batteries in Electric Vehicle Applications
[I-20221303]
Aalborg University 217 pp. () = Dissertation, Aalborg University, 2024  GO
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2025-07-04
16:57
OpenAccess [PUBDB-2025-02203] Book/Dissertation / PhD Thesis
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Search for Light Pseudoscalars in Exotic Decays of the Higgs Boson with the CMS Experiment
[DESY-THESIS-2025-013]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY THESIS 259 pp. () [10.3204/PUBDB-2025-02203] = Dissertation, Universität Hamburg, 2025  GO
This thesis presents a search for a pair of light pseudoscalar bosons produced from the decays of the 125 GeV Higgs boson, focusing on final states with four tau leptons. This searchis motivated by numerous beyond the standard model theories that predict an extended scalar sector, introducing a wide array of new physical states beyond the single Higgs boson observed in the standard model. [...]
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2025-07-01
09:53
OpenAccess [PUBDB-2025-02111] Book/Dissertation / PhD Thesis
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Studies of a Digital SiPM and MAPS Prototypes as Key Technologies for Future High-Energy Physics Experiments
[DESY-THESIS-2025-012]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 169 pp. () [10.48565/BONNDOC-546] = Dissertation, University of Bonn, 2025  GO
Digital Silicon Photomultipliers (dSiPMs) and Monolithic Active Pixel Sensors (MAPS) are emerging technologies, fabricated using commercial Complementary Metal-Oxide-Semiconductor (CMOS) processes. These detectors have the potential to become key components in High-Energy Physics (HEP), with the ability to meet the demanding requirements of future experiments. [...]
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2025-06-17
21:50
[PUBDB-2025-01898] Dissertation / PhD Thesis

Supercapacitors with Aqueous Electrolytes: What Can We Learn from In-Situ and Operando Synchrotron and Neutron Techniques?
217 pp. () = Dissertation, Montanuniversität Leoben, 2025  GO
This thesis investigates the fundamental processes governing supercapacitors with aqueous electrolytes through the development and application of in-situ and operando synchrotronand neutron techniques. Using a suite of complementary methods, including X-ray Transmission (XRT), X-ray Fluorescence (XRF), (Anomalous) Small-Angle X-ray Scattering ((A)SAXS), Small-Angle Neutron Scattering (SANS), X-ray Diffraction (XRD), and Neutron Diffraction (ND), a detailed experimental framework is established to probe supercapacitor behaviour under working conditions. [...]
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2025-06-16
11:58
OpenAccess [PUBDB-2025-01873] Dissertation / PhD Thesis
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Towards Spin-Polarized Electron Beams from a Laser-Plasma Accelerator
Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky 227 pp. () [10.3204/PUBDB-2025-01873] = Dissertation, University of Hamburg, 2025  GO
The LEAP (Laser Electron Acceleration with Polarization) project at DESY is a proof-of-principle experiment aiming to demonstrate the generation -- thus also the transport -- of spin-polarized electron beams from a laser-plasma accelerator (LPA). This is expected to be achieved using a pre-polarized plasma source, generated via the photodissociation of HCl molecules with an ultraviolet (UV) dissociation laser. [...]
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2025-06-11
16:39
OpenAccess [PUBDB-2025-01839] Book/Dissertation / PhD Thesis
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Generating Calorimeter Showers as Point Clouds
[DESY-THESIS-2025-011]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 175 pp. () [10.3204/PUBDB-2025-01839] = Dissertation, RWTH Aachen University, 2025  GO
Simulating particle interactions within high-energy physics detectors is essential for interpretingexperimental data and advancing our understanding of fundamental physics. Calorimetersmeasure particle energies through cascades known as showers, but their complex responsesand the computational intensity of traditional simulation tools like Geant4 posesignificant challenges. [...]
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2025-05-23
10:48
OpenAccess [PUBDB-2025-01721] Book/Dissertation / PhD Thesis
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Multidimensional and Multimodal Soft X-ray Methods for Quantum Materials Research
[DESY-THESIS-2025-009]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 171 pp. () [10.3204/PUBDB-2025-01721] = Dissertation, Universität Hamburg, 2025  GO
Quantum materials are governed by a complex interplay of spin, orbit, charge and lattice degrees of freedom, resulting in emergent phenomena like high-temperature superconductivity, charge and orbital ordering and insulator-to-metal transitions (IMTs). Often, the interaction of these subsystems results in an energy landscape with multiple local minima favouring different phases. [...]
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2025-05-20
13:59
OpenAccess [PUBDB-2025-01709] Book/Dissertation / PhD Thesis
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The Higgs Branch of Six Dimensional Supersymmetric Theories: Magnetic Quivers, Geometry, and Hasse Diagrams
[DESY-THESIS-2025-010]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 217 pp. () [10.3204/PUBDB-2025-01709] = Dissertation, Universität Hamburg, 2025  GO
In this thesis, we report recent advancements in the understanding of Higgs branch moduli spacesof six-dimensional (1,0) supersymmetric quantum field theories, along with related developments.These progresses have been achieved by exploiting the interplay between geometrical engineeringand techniques in quiver gauge theories, leading to new insights into the Higgs mechanism’s actionin higher-dimensional supersymmetric theories.Paper I: We present an extension of the magnetic quiver technique to a class of non-gravitationalsupersymmetric quantum field theories in six dimensions known as Little String Theories (LSTs).These theories also exhibit a higher-group symmetry structure. Notably, we prove a monotonicitytheorem describing the evolution of κR, a quantity characterizing the higher group symmetry, underpartial Higgsing patterns.Paper II: Specializing to a brane engineering framework, we construct a family of LST modelswith a natural interpretation as an F-theory compactification. [...]
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