Books

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. [...]

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. [...]

The pioneer synthesis of nanocrystals (NCs) published in 1993 opened up new routes to prepare highly monodisperse quantum dots. This, together with the outstanding electronical, optical and surface properties observed in different kinds of such semiconductor nanocrystals, has triggered an increased scientific interest on these nanomaterials. [...]

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. [...]

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. [...]

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. [...]

Synchrotron radiation sources and free-electron lasers have revolutionised the study of matter and biological systems by providing unique combinations of radiation pulse characteristics. Although these two types of facilities differ fundamentally in terms of pulses time scales, coherence properties, and (peak) brilliance, each offers an exceptional mix of these features. [...]

ISI oder SCOPUS Publikationen mit DESY Autor sowie alle Dissertationen mit DESY Beteiligung

The tools of statistical analysis for experiments in modern physical applications are increasingly sophisticated and specific tools are needed to reliably extract results from complex data. This textbook thus presents a comprehensive treatment of the topic for the practicing physicist, focusing less on mathematical foundations but appealing to intuitive techniques with a large number of examples.This fourth edition is greatly expanded with new sub-topics not covered in standard textbooks. [...]

As the leading theory in particle physics, the Standard Model (SM) defines our understanding of the subatomic world. However, observed phenomena have proven that the SM, despite its great success, is not complete yet and the search for particles Beyond the Standard Model (BSM) has surged ever since. [...]