Ph.D. Theses

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2017-08-15
09:47
OpenAccess [PUBDB-2017-09253] Book/Report/Dissertation / PhD Thesis
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Aspects of Six-Dimensional Flux Compactifications
[DESY-THESIS-2017-036]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 141 pp. (2017) [10.3204/PUBDB-2017-09253] = Universität Hamburg, Diss., 2017  GO
In this thesis we investigate various aspects of ux compactications in six-dimensionalquantum eld theories. After introducing the internal geometries, i.e. [...]
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2017-08-11
13:51
OpenAccess [PUBDB-2017-09190] Book/Report/Dissertation / PhD Thesis
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Search for contact interactions and finite quark radius using combined $e^{\pm}p$ data at HERA
[DESY-THESIS-2017-035]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 163 pp. (2017) [10.3204/PUBDB-2017-09190] = Universität Hamburg, Diss., 2017  GO
A combination is presented of all previously published deep inelastic neutral and charged current $e^{\pm}p$ scattering measurements at HERA for zero beam polarisation.The ZEUS and H1 collaborations have collected data at electron beam energy of $27.5$ GeV and proton beam energies of $920$, $820$, $575$ and $460$ GeV.The combined data correspond to an integrated luminosity of about $1$ fb$^{-1}$ and cover a kinematic range in the negative four-momentum-transfer squared from $Q^{2} = 0.045$ GeV$^{2}$ to $Q^{2} = 50000$ GeV$^{2}$ and in Bjorken $x$ from $x_{\rm Bj} = 6 \times 10^{-7}$ to $x_{\rm Bj} = 0.65$.The correlations of systematic uncertainties between different sets of data were taken into account, resulting in significantly improved precision.The combined $e^{\pm}p$ cross sections were used in a QCD analysis at next-to-leading order, providing a set of parton distribution functions, called ZCIPDF.The combined measurements were also used in an analysis beyond the Standard Model using a new approach, performing simultaneous fits on large sets of Monte Carlo replicas of parton distribution functions, PDFs, together with the parameters of "new physics" processes.A simplified approach to reduce the calculation time was developed and extensively tested.It allowed the calculation time to be reduced by about a factor of 50.The resulting $95\,\%$ C.L. upper limit on the effective quark radius is $0.43 \cdot 10^{-16}$ cm and the limits on the mass scales for different contact interaction scenarios extend up to $10$ TeV.The analyses have shown that taking into account the possible influence of processes beyond the Standard Model on the PDF parameters is necessary, since the limits that would be obtained using PDFs from QCD analysis within the Standard Model are too strong by about $10\,\%$.Studies of the surface quality of 28 Niobium superconducting radio frequency, SRF, cavities and development of a controllable cooling system for Niobium samples are also reported.The SRF cavities are the core of the accelerating technology for the future International Linear Collider, ILC; the reported studies are part of an ongoing research and development program..
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2017-08-10
16:14
[PUBDB-2017-09144] Book/Dissertation / PhD Thesis
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Insights into Protein Dynamics by Time-resolved X-ray Scattering
7-150 (2015) = Georg-August-Universität Göttingen, Diss., 2014

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2017-08-08
14:33
OpenAccess [PUBDB-2017-08913] Book/Report/Dissertation / PhD Thesis
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Power scaling of ultrafast mid-IR source enabled by high-power fiber laser technology
[DESY-THESIS-2017-034]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 118 pp. (2017) [10.3204/PUBDB-2017-08913] = Universität Hamburg, Diss., 2017  GO
In this thesis, we propose and demonstrate a novel approach to power scaling of DFG-based ultrafast mid-IR laser sources. The essence of this novel approach is the generation of a high-energy signal beam. [...]
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2017-08-03
23:52
[PUBDB-2017-136540] Dissertation / PhD Thesis

Towards the confirmation of QCD on the lattice: Improved actions and algorithms
Juelich : NIC, NIC series, 43, 89 p (2009) = Berg. University, Diss., 2009
ONLINE Diss. E Kri
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2017-08-03
23:52
[PUBDB-2017-136449] Dissertation / PhD Thesis

Simulation studies and validation towards a TOF-PET detector
Hamburg : Hamburg Univ., 95 p (2011) = University of Hamburg, Inst. Exp.-Phys., Diss., 2011
ONLINE Diss. M Heg
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2017-08-03
23:52
[PUBDB-2017-136796] Dissertation / PhD Thesis

A search for muon neutrino to electron neutrino oscillations in the MINOS experiment
New York : Springer, Springer theses, 294 p (2011) = Calif. Inst. Technol., Diss., 2009
Diss. E Och
Nominated as an outstanding contribution from the California Institute of Technology, this volume lays the foundation for new research in the field of neutrinos. This in-depth, creative approach to a variety of complex problems is an outstanding example for graduate students and practitioners alike
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2017-08-03
23:52
[PUBDB-2017-136394] Dissertation / PhD Thesis

A flavour of family symmetries in a family of flavour models
Leiden : Leiden Univ., Casimir PhD series 2012-3, 198 p (2012) = University of Leiden, Diss., 2012
Diss. E de A
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2017-08-03
23:52
[PUBDB-2017-136996] Dissertation / PhD Thesis

Glueball properties from the Bethe-Salpeter equation
Berlin : Logos-Verl., 175 p (2012) = Techn. University, Diss., 2012
Diss. E Kel
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2017-08-03
23:52
[PUBDB-2017-133156] Dissertation / PhD Thesis

Mikrostrukturanalyse von Piezokeramiken mit Hilfe von Neutronen- und Synchrotronstrahlung; 1. Aufl.
Goettingen : Sierke, 224 S (2011) = Techn. University, Diss., 2011
Diss. P Hin
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