# Ph.D. Theses

 2019-10-1514:57 [PUBDB-2019-03677] Dissertation / PhD Thesis Haller, J. Precision measurement of thetop quark pair production cross sectionat√s = 13 TeV with the CMS detector 1 - 138 (2019) = Dissertation, Hamburg University, 2018 This work presents several measurements of the inclusive top pair production cross sectionat a center of mass energy of√s = 13 TeV with the CMS detector. The cross section ismeasured using several data sets collected by the CMS detector in 2015 and 2016. [...] Restricted: PDF; 2019-10-0116:19 [PUBDB-2019-03551] Book/Report/Dissertation / PhD Thesis Gruebel, G. Development of a compact hard X-ray split-and-delay line for studying ultrafast dynamics at free electron laser sources [DESY-THESIS-2019-023] Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 140 pp. (2019) [10.3204/PUBDB-2019-03551] = Dissertation, Universität Hamburg, 2019   The study of condensed matter dynamics on ultrafast timescales is one of the key topics in modern material science research. Hard X-ray free-electron laser sources with extreme peak brightness and ultra short pulses provide excellent conditions for studying ultrafast dynamics in the time domain by employing such techniques as X-ray pump-probe spectroscopy or X-ray photon correlation spectroscopy. [...] OpenAccess: desy-thesis-19-023.title - PDF PDF (PDFA); Thesis - PDF PDF (PDFA); 2019-08-3014:05 [PUBDB-2019-03157] Dissertation / PhD Thesis Froemter, R. The magnetic properties of ultrathin Cobalt multilayers symmetrically and antisymmetrically sandwiched between layers of platinum and iridium 223 pp. (2019) [10.3204/PUBDB-2019-03157] = Dissertation, Universität Hamburg, 2018   This thesis deals with a systematic study of magnetic properties, i.e. saturation magnetization, exchange stiffness, anisotropy, interlayer exchange coupling, and average domains size, of ultrathin Co-based multilayer systems. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2019-08-2217:04 [PUBDB-2019-03086] Book/Report/Dissertation / PhD Thesis Gallo-Voss, E. Search for supersymmetry with tau leptons in the CMS experiment [DESY-THESIS-2019-020] Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 205 pp. (2019) [10.3204/PUBDB-2019-03086] = Dissertation, Universität Hamburg, 2019   This thesis is focused on the search for pair production of the supersymmetric $\tau$ lepton partners within the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC). The search is performed using the data collected at a center-of-mass-energy $\sqrt{s} = 13$ TeV with the CMS detector in the years 2016-2017.One of the most popular extensions of the Standard Model (SM) is supersymmetry (SUSY). [...] OpenAccess: desy-thesis-19-020.title - PDF PDF (PDFA); Thesis_babounikau - PDF PDF (PDFA); 2019-08-2113:04 [PUBDB-2019-03055] Dissertation / PhD Thesis Gross, O. Precious metal based bulk glass-forming liquids : development, thermodynamics, kinetics and structure Universität des Saarlandes 132 pp. (2018) [10.22028/D291-27993] = Dissertation, Saarland University, 2019   Bulk glass-forming alloy compositions are found in various noble-metal based systems. Their superior properties and their high noble metal content predestinate these alloy classes for the application as jewelry alloys [...] OpenAccess: PDF PDF (PDFA); 2019-08-1415:24 [PUBDB-2019-03013] Book/Report/Dissertation / PhD Thesis Moortgat-Pick, G. From the Machine-Detector Interface to Electroweak Precision Measurements at the ILC — Beam-Gas Background, Beam Polarization and Triple Gauge Couplings [DESY-THESIS-2019-018] Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 330 pp. (2019) [10.3204/PUBDB-2019-03013] = Dissertation, Universität Hamburg, 2019   The International Linear Collider (ILC) is a planned electron-positron collider with a first stage at a center-of-mass energy of 250 GeV. The electron beam will be polarized to 80% and the positron beam to 30%. [...] OpenAccess: desy-thesis-19-018.title - PDF PDF (PDFA); ThesisRobertKarl - PDF PDF (PDFA); 2019-08-1413:31 [PUBDB-2019-03011] Book/Report/Dissertation / PhD Thesis Foster, B. Electron-beam diagnostics for a laser-driven plasma wakefield accelerator in the framework of FLASHForward [DESY-THESIS-2019-015] Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 139 pp. (2019) [10.3204/PUBDB-2019-03011] = Dissertation, Universität Hamburg, 2018   Plasma wakefields are a promising approach for the acceleration of electrons with ultrahigh (10 to 100 GV/m) electric fields. Nowadays, high-intensity laser pulses are routinely utilized to excite these large-amplitude plasma waves. [...] Restricted: desy-thesis-19-015.title - PDF PDF (PDFA); Thesis_Schwinkendorf - PDF; 2019-08-1320:50 [PUBDB-2019-03009] Book/Report/Dissertation / PhD Thesis Moch, S.-O. High-precision computation of observables in supersymmetric Yang–Mills theory [DESY-THESIS-2019-019] Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 149 pp. (2019) [10.3204/PUBDB-2019-03009] = Dissertation, Universität Hamburg, 2019   In this thesis we discuss modern mathematical tools for the perturbative analysis of supersymmetric Yang–Mills theories (abbreviated SYM). We apply contemporary and traditional computational techniques to two kind of problems. [...] OpenAccess: desy-thesis-19-019.title - PDF PDF (PDFA); thesis - PDF PDF (PDFA); 2019-08-1311:36 [PUBDB-2019-02996] Dissertation / PhD Thesis Burgmeier, A. Position Resolution and Upgradeof the CMS Pixel Detector andSearch for the Higgs Boson in the $\tau^+ \tau^-$ Final State 2015 pp. (2014) [10.3204/PUBDB-2019-02996] = Dissertation, Karlsruhe Institute of Technology, 2014   OpenAccess: PDF PDF (PDFA); 2019-08-1311:17 [PUBDB-2019-02995] Dissertation / PhD Thesis Schleper, P. Search for SUSY in Same-Sign Di-LeptonEvents with the CMS Detector 160 pp. (2012) [10.3204/PUBDB-2019-02995] = Dissertation, Hamburg University, 2012   In this thesis a search for new physics is presented, based on events with two isolated same sign leptons (muons and electrons), jets, and missing transverse energy. The analyzed data corresponds to an integrated luminosity of 1.1 fb$^{-1}$ and is collected with the CMSdetector in proton-proton collisions at the LHC with a center-of-mass energy of 7TeV. [...] OpenAccess: PDF PDF (PDFA);