Ph.D. Theses

The advancement of particle physics through current and future collider facilities pushes theboundaries of technology in HEP instrumentation. Experiments at the energy and intensityfrontier focus on high-precision measurements of Standard Model physics and searches forphysics beyond the Standard Model. [...]

The High-Luminosity Large Hadron Collider (HL-LHC) represents a significant leap inthe pursuit of fundamental physics. Scheduled to operate at a center-of-mass energy of14 TeV and a peak instantaneous luminosity up to 7. [...]

The production of top-quark pairs $t\bar{t}$ is extensively studied at the Large Hadron Collider (LHC) due to its importance in probing fundamental parameters of the Standard Model (SM) and its role as a background in various searches for physics Beyond the Standard Model (BSM). In particular in conjunction with ttbar, single-top is also an important process in measurements and searches, but less studied and more challenging to treat theoretically. [...]

Keramische Hartstoffschichten sind zu einer Notwendigkeit geworden, um die die Eigenschaften von Werkzeugen und Bauteilen zu verbessern und damit deren Lebensdauer zu verlängern. Besonders hervorzuheben ist die Klasse der Übergangsmetallnitride, wobei kubisch flächenzentriertes (kfz) Titannitrid (TiN) als das am häufigsten verwendete und untersuchte Schichtmaterial einen Spezialfall darstellt. [...]

This thesis presents a search for supersymmetry using 138 fb−1 of proton-proton collisionat center-of-mass energy of √s = 13 TeV. The data was collected by the CMS detectorat the LHC at CERN in 2016–2018. [...]

In High-Energy Physics, detailed and time-consuming simulations are neededto describe particle showers in calorimeters. These particle showers arerecorded as energy deposits (hits) in the cells of the detector. [...]

This thesis addresses key challenges in modern particle physics by contributing to threecritical areas: the development of particle detectors, their calibration and the analysis ofdata collected in particle physics experiments. Contributions to these areas are presentedin the context of the Compact Muon Solenoid (CMS) experiment at the Large HadronCollider (LHC).The first part of this work focuses on the development and characterization of a temperaturetest system (Burn-in) for silicon modules, essential components of the CMS OuterTracker Upgrade, a central part of the preparation of CMS for the forthcoming High LuminosityLHC running [...]

Gegenstand dieser Arbeit ist die hochpräzise Herstellung von Silizium-Lamellengitterspiegeln für die reflektierende Split-and-Delay-Unit (SDU) im extremen Ultraviolett- und weichen Röntgenbereich (Photonenenergien von 10 eV bis ~1 keV). Um die gute Reflektivität der Spiegel zu gewährleisten, war es notwendig, eine gute Oberflächenqualität zu erhalten, um die geringe Rauheit zu bewahren und die auftretenden Verformungen zu minimieren. [...]