Books

Gravitational waves have recently emerged as a novel messenger inastronomy, providing profound insights into the evolution of the cosmos:Last year, several pulsar timing arrays (PTAs) announced the detectionof a gravitational wave background (GWB) at nHz frequencies, markinga significant milestone in this field. This discovery can be interpretedas a signal emitted by the inspiral of supermassive black holes duringhierarchical structure formation. [...]

The lack of signals in traditional dark matter (DM) searches beyond gravitational interactions provide an excellent reason to investigate weakly coupled and/or light dark sectors(DS). These receive motivation both from the theoretical and the phenomenological side with rich physics across many different scales. [...]

This thesis presents the search for heavy neutral Higgs bosons, produced in associationwith b-quarks and decaying into a b-quark pair in proton-proton collisions at a centre-ofmassenergy of 13 TeV at the LHC with the CMS detector. The process is chosen, giventhat a considerable enhancement of the coupling to b-quarks is possible in theories beyondthe Standard Model, such as the Minimal Supersymmetric extension of the StandardModel (MSSM) and the Two Higgs Doublet Model (2HDM). [...]

This thesis presents differential and total charm cross section measurements at various centerof-mass energies in pp collisions. For the purpose of measuring the total charm cross section,the D∗+ differential cross sections are measured at √s = 7, 0.9 and 13 TeV in the CMSdetector by covering the largest possible phase space, resulting in the smallest extrapolationfactor ever introduced at the LHC. [...]

Individual functional viral morphogenesis events are often dynamic, short, and infrequent and might be obscured by other pathways and dead-end products. Volumetric live cell imaging has become an essential tool for studying viral morphogenesis events [...]

The MSSM is one of the most promising extensions of the SM. In the MSSM, the masses of the Higgs bosons can be predicted in terms of the other model parameters.In this thesis, we calculate for the first time the full electroweak two-loop contributions of $\mathcal{O}((\alpha_\text{em} + \alpha_\text{q})^2 N_c^2)$ to the MSSM Higgs boson masses using a Feynman-diagrammatic approach including the full dependence on the external momentum.These corrections are expected to constitute the dominant part of the two-loop corrections that were still missing up to now. [...]

Monte Carlo simulations are an important tool in high-energy physics, e.g. to test the predictions of theory models or to infer a priori unknown parameters of the models. [...]

Feynman integrals are central to the calculation of scattering amplitudes both in particle and gravitationalwave physics. This thesis presents advancements in both the analytical and algebraicstructure of these integrals and shows how this can be used for efficient evaluation of these integrals.Paper I. [...]