Ph.D. Theses

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2020-05-20
15:36
OpenAccess [PUBDB-2020-02176] Book/Report/Dissertation / PhD Thesis

Search for supersymmetric particles in gluino-gluino pair production events at CMS
[DESY-THESIS-2020-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 133 pp. () [10.3204/PUBDB-2020-02176] = Dissertation, Universität Hamburg, 2019  GO
A search for gluino pair production with events using 35.9 fb−1of data from ppcollisions at a center-of-mass energy of 13 TeV in 2016 is presented. Two differentcascade decay modes of gluinos are considered, and separate analyses for each of themodels are performed [...]
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2020-05-15
16:48
OpenAccess [PUBDB-2020-02143] Book/Report/Dissertation / PhD Thesis

Search for Light Bosons in Exotic Decays of the 125 GeV Higgs Boson
[DESY-THESIS-2020-007]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 173 pp. () [10.3204/PUBDB-2020-02143] = Dissertation, Universität Hamburg, 2020  GO
A search for pairs of light bosons produced from decays of the 125 GeV Higgs boson is presented. The search covers the light boson mass region where the particle could have an enhanced decay rate to a pair of τ leptons, according to different models and scenarios.The leptonic decay channels corresponding to the 4τ and 2μ2τ final states are used. [...]
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2020-05-15
09:25
OpenAccess [PUBDB-2020-02131] Book/Report/Dissertation / PhD Thesis

Cross Section measurements of $t\bar{t}$ pair production in the boosted regime in proton-proton collisions at $\sqrt{s}=13$ TeV with the CMS experiment at the Large Hadron Collider
[DESY-THESIS-2020-006]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 274 pp. () [10.3204/PUBDB-2020-02131] = Dissertation, Universität Hamburg, 2019  GO
In this thesis measurements of the $t\bar{t}$ pair production at the very high transverse momentum are presented. When a top quark is produced with very high momentum the decay products are collimated in the direction of the quark, and they can be clustered within a single large cone size jet. [...]
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2020-05-05
13:19
[PUBDB-2020-01735] Dissertation / PhD Thesis

Emittance Measurements at Laser-Wakefield Accelerators
145 pp. () = Dissertation, University of Hamburg, 2019
Laser-wakefield accelerators enable the generation of electron beams with initially nm-small emittances and GeV-level beam energies within cm-scale distances and are thereforepromissing candidates for drivers of future experiments. However, the percent-level energy-spreads and shot-to-shot fluctuations in beam quality can pose a limit to the transportability of plasma-generated beams, and further impete the measurement of the beam emittance using conventional methods.In the framework of this thesis, two energy-resolved phase-space diagnostics, a single-shot and a multi-shot method, have been implemented at the LUX laser-plasma accelerator.Electron beams from ionization injection are imaged by a compact quadrupole doublet from a virtual source into a dispersive electron spectrometer, which allows to measurethe beam emittance, beam size, divergence and phase-space correlation on the singleenergy-slice level. [...]
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2020-04-17
10:09
OpenAccess [PUBDB-2020-01501] Book/Report/Dissertation / PhD Thesis

Integrability in N = 1 Gauge Theories
[DESY-THESIS-2020-005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 139 pp. () [10.3204/PUBDB-2020-01501] = Dissertation, Universität Hamburg, 2020  GO
In this thesis we investigate two questions that shed new light on fundamentalproperties of supersymmetric gauge theories.Our first topic deals with the question, which implications results for N = 4 Super-Yang-Mills have on theories with less symmetry. Specifically we conjecture that thedilatation operator in the SU(2, 1|1) sector of any N = 1 superconformal gauge theorycan be found from the one for N = 4 Super-Yang-Mills by a redefinition of the couplingconstant. [...]
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2020-03-15
22:14
OpenAccess [PUBDB-2020-01054] Book/Report/Dissertation / PhD Thesis

Studying chiral molecules with broadband microwave spectroscopy
[DESY-THESIS-2020-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 204 pp. () [10.3204/PUBDB-2020-01054] = Dissertation, Universität Hamburg, 2019  GO
Natural essential oils are complex mixtures containing several compounds of structural similarity.They are well known for their wide range of applications in different areas, frommedicine to cosmetics. One of the conventional methods for their quantitative analysis is gaschromatography (GC). [...]
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2020-03-12
19:37
OpenAccess [PUBDB-2020-01029] Dissertation / PhD Thesis
et al
Enhancing x-ray diffactive imaging and optical microscopy by use of intensity correlations
204 pp. () [10.3204/PUBDB-2020-01029] = Dissertation, FAU Erlangen-Nürnberg, 2019  GO
In this thesis we propose intensity correlation enhanced imaging techniques in two major areas of imaging with light. The first area is diffractive imaging. [...]
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2020-03-12
19:26
OpenAccess [PUBDB-2020-01028] Dissertation / PhD Thesis
et al
Investigation of Ultrafast Molecular Dynamics via Covariance Mapping -A Tool for Intense XUV Light Sources
118 pp. () [10.3204/PUBDB-2020-01028] = Dissertation, Lund University, 2019  GO
The study of molecular dynamics involves observations of the motion of nuclei and electrons. While nuclear motion is usually on the picosecond or femtosecond timescale, attosecond precision is necessary to directly observe the motion of electrons. [...]
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2020-03-12
19:14
OpenAccess [PUBDB-2020-01027] Dissertation / PhD Thesis
et al
Ultrafast Photoionization Dynamics Studied with Coincidence Momentum Imaging Spectrometers
139 pp. () [10.3204/PUBDB-2020-01027] = Dissertation, Lund University, 2019  GO
The time scale of the dynamics in atoms and molecules varies from attoseconds (10-18) to picoseconds (10-12) depending on the size of the particles. To study such dynamics, ultrafast light pulses are needed to trigger and capture the reaction. [...]
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2020-03-12
19:00
OpenAccess [PUBDB-2020-01026] Dissertation / PhD Thesis
et al
Shape Resonances as a Probe of an Evolving Nuclear and Electronic Structure in Molecules
Freie Universität Berlin 176 pp. () [10.17169/REFUBIUM-1735] = Dissertation, FU Berlin, 2019  GO
Shape resonances are a ubiquitous phenomenon in electron–molecule scattering, in which the impinging electron is resonantly captured in a pseudo-bound state that is supported by the molecular potential. To study the electron scattering dynamics, we use time- and angle- resolved photoelectron spectroscopy here. [...]
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