E-Dissertationen: Suche
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Measurement of the beam and helicity asymmetries in the reactions γp → pπ0 and γp → pη
(2019-09-24)
Nucleons are bound states composed of quarks and gluons. The study of the nucleon excitation spectra gives insight into the underlying dynamics between quarks and gluons that are governed by the strong interactions and ......
Measurement of Tau Polarisation in Z/γ* → ττ Decays in Proton–Proton Collisions at ATLAS
(2019-12-19)
This thesis presents a measurement of the tau polarisation in Z/gamma*->tautau decays at ATLAS using a dataset of proton–proton collisions recorded at a centre-of-mass energy of sqrt(s) = 8 TeV that amounts to an integrated ...
Probing the Magnetized Medium of Galaxies and AGNs using Wideband Radio Polarimetry
(2019-08-13)
I performed an observational study of diffuse linearly polarized synchrotron emission of a nearby galaxy and of extragalactic background sources in order to study cosmic magnetism. The speciality of my work is given by the ......
Pulsar Searching and Timing with the Arecibo and Effelsberg Radio Telescopes
(2019-08-13)
Pulsars are rapidly rotating, highly magnetized, neutron star remnants of the supernova explosions of massive stars. In this thesis, I mostly focus on recycled pulsars, which are old (approx 100 million years old) neutron ...
Three-pion dynamics at COMPASS: resonances, rescattering and non-resonant processes
(2019-12-13)
This thesis presents studies of the strong interaction in the non-perturbative regime by analyzing the properties of hadronic resonances. The basis for this research is the world's largest dataset on diffractive reactions, ...
Search for the Standard Model Higgs boson pair production and new physics phenomena in the bb τ+hadτ-had final state with the ATLAS detector
(2019-12-12)
A search for the Standard Model (SM) Higgs boson pair production and new physics phenomena in the $bbar{b}tau_{had}^+ tau_{had}^-$ final state is presented. The search uses $SI{36.1}{fb^{-1}}$ of $pp$ collisions data at a ...
Fast diffusion MRI based on sparse acquisition and reconstruction for long-term population imaging
(2019-11-21)
Diffusion weighted magnetic resonance imaging (dMRI) is a unique MRI modality to probe the diffusive molecular transport in biological tissue. Due to its noninvasiveness and its ability to investigate the living human brain ...
Optimierung des Beschleunigerbetriebs für Experimente zur Hadronen- und Detektorphysik an der Elektronen-Stretcher-Anlage ELSA
(2019-07-30)
An der Elektronen-Stretcher-Anlage ELSA des Physikalischen Instituts der Universität Bonn werden an den beiden Experimentierplätzen Crystal Barrel/TAPS und BGO-OD Experimente zur Untersuchung der inneren Struktur von ...
Optical investigations on PTCDA on KCl(100): Superradiant aggregates and single molecules
(2019-08-23)
In the present work, condensed and diluted phases of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) were investigated on thin KCl(100) films on the Ag(100) surface. The samples were structurally characterized by spot ...
K-K and π-K Scattering Lengths at Maximal Isospin from Lattice QCD
(2019-08-02)
The current work presents calculations of the elastic scattering length a0 for systems of two Kaons and one pion and one Kaon, respectively. The values for a0 have been obtained from lattice QCD ......