# Master Theses

 2023-01-3109:51 [PUBDB-2023-00581] Master Thesis Tayade, A. ; Gregor, I.-M. Tracking in Dense Environments for theATLAS ITk Strip Detector 77 pp. (2022) = Masterarbeit, Rheinische Friedrich-Wilhelms-Universität Bonn, 2022   The Phase II upgrade of the ATLAS detector will prepare it to handle the 2.5–fold increase in instantaneous luminosity of the High Luminosity LHC project starting in 2028. The upgrade will also involve the tracking sub-system of the ATLAS detector to be replaced by the Inner Tracker (ITk), which is made up of a closer-to-beam-line Pixel and a circumscribing Strip detector. [...] Restricted: PDF PDF (PDFA); 2023-01-2316:21 [PUBDB-2023-00485] Master Thesis de Ligt, K. ; Schwanenberger, C. ; Grohsjean, A. Effects of model parameter variations forthe bbH$\to$Za$\to$ll$_{χχ}$ process in theperformance of multivariate classifiers University of Hamburg 81 pp. (2023) = Masterarbeit, University of Hamburg, 2023   The first goal of this thesis was to check whether the parameter variations of the 2HDM+a model,in the process of bbH$\to$Za$\to$ll$_{χχ}$, have an impact on multivariate methods. The second goalwas to check the feasibility of using a singular deep neural network trained on all given masspoints of the heavy Higgs and dark matter mediator.It was found that the variation of model parameters unrelated to mass of particles had no sig-nificant impact on the performance of multivariate methods. [...] Restricted: PDF PDF (PDFA); 2023-01-1913:49 [PUBDB-2023-00364] Master Thesis Laudamus, K. ; Gallo-Voss, E. ; Stapf, B. Studies of di-Higgs production at the FCC-hh in the $HH \to b\bar{b} ZZ^∗ \to bb\ell\ell \nu\nu$ channel Hamburg : University of Hamburg 53 pp. (2022) = Masterarbeit, University of Hamburg, 2022   The FCC-hh is a proposed circular hadron collider at an energy of 100 TeV. Thetotal integrated luminosity is expected to be around 30 ab$^{−1}$. [...] Restricted: PDF PDF (PDFA); 2023-01-1711:51 [PUBDB-2023-00282] Master Thesis Ruiz Daza, S. ; Gregor, I.-M. ; Dingfelder, J. Monte Carlo Simulations of DetectorPrototypes Designed in a 65 nm CMOSImaging Process 91 pp. (2022) = Masterarbeit, Rheinischen Friedrich-Wilhelms-Universität, 2022   Restricted: PDF PDF (PDFA); 2022-12-2922:27 [PUBDB-2022-08212] Master Thesis Gerharz, M. ; Evers, J. Temporal phase and polarization interferometry at x-ray energies 139 pp. (2021) = Masterarbeit, Ruprecht-Karls-Universität Heidelberg, 2021   In x-ray quantum optics, many experimental schemes and techniques that are widelyused at visible frequencies are hard to implement. Key difficulties are the measure-ment of complex phases on the detection side and temporal pulse shaping on the lightsource side. [...] Restricted: PDF PDF (PDFA); 2022-12-2014:23 [PUBDB-2022-07911] Master Thesis Gierke, A. ; Gruebel, G. ; Gorkhover, T. Design of a liquid jet environment for X-ray scattering experiments on complex liquids 74 pp. (2022) = Masterarbeit, University of Hamburg, 2022   In this thesis two applications of liquid jets were studied. Firstly, the combination between the rheology technique and X-ray scattering approach on complex fluids was investigated. [...] Restricted: PDF PDF (PDFA); 2022-11-1714:05 [PUBDB-2022-06807] Master Thesis Lübsen, J. ; Schütte, M. ; Schulz, S. ; et al Bayesian Optimization for the Control Parameters of the Optical Synchronization System at European XFEL 74 pp. (2022) = Masterarbeit, Hamburg University of Technology, 2022   Linear particle accelerators require outstanding synchronization of the subsystems to provide high quality results for temporally resolved experiments. Considering the laser-based synchronization system at the European X-Ray Free-Electron Laser, this thesis shows the optimization of such large and complex systems whereby safety constraints are fulfilled. [...] Restricted: PDF PDF (PDFA); 2022-11-0714:45 [PUBDB-2022-06500] Master Thesis Fischer, L. ; Kowalski, M. ; Uwer, U. A New Method for Low Energy Event Classification in IceCube DeepCore 76 pp. (2019) = Masterarbeit, Heidelberg University, 2019   Neutrino oscillations, the phenomenon that neutrinos can change their flavor after propagation through space, is proof of their non-zero masses and, therefore, a sign of new physics beyondthe Standard Model. IceCube is a cubic kilometer Cherenkov neutrino detector buried in the Antarctic glacial ice at the geographic South Pole. [...] Restricted: PDF PDF (PDFA); 2022-11-0611:58 [PUBDB-2022-06443] Book/Master Thesis Elhag, H. S. M. ; Bhattacharya, S. ; Melzer-Pellmann, I. ; et al Tagging of Leptonically Decaying Boosted Top Quarks Using Machine Learning [DESY-THESIS-2022-024] Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 72 pp. (2022) [10.3204/PUBDB-2022-06443] = Masterarbeit, Universität Hamburg, 2022   The study of boosted top quarks is very important for probing a wide variety of new physics models. When considering the leptonic channel decay mode of highly boosted top quarks, the axis of the jet resulting from the bottom quark gets very close in distance to the lepton. [...] OpenAccess: desy-thesis-22-024.title - PDF PDF (PDFA); MScProject_Thesis_Hala - PDF PDF (PDFA); 2022-10-1803:20 [PUBDB-2022-05177] Book/Master Thesis Chen, Z. ; Gallo-Voss, E. ; Cardini, A. Tau reconstruction in CMS exploiting machine learning techniques [DESY-THESIS-2022-021] Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 55 pp. (2022) [10.3204/PUBDB-2022-05177] = Masterarbeit, Universität Hamburg, 2022   Reconstruction of hadronically decaying tau leptons (denoted as $\tau_h$) in the CMS experiment at the Large Hadron Collider has been historically performed with the hadron-plus-strip (HPS) algorithm. This thesis covers a study to improve the tau decay mode (DM) reconstruction using machine learning techniques. [...] OpenAccess: MASTERARBEIT - PDF PDF (PDFA); desy-thesis-22-021.title - PDF PDF (PDFA);