Ph.D. Theses

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2018-08-14
15:48
OpenAccess [PUBDB-2018-02949] Book/Report/Dissertation / PhD Thesis
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Determination of TMD parton densities from HERA data and application to pp processes
[DESY-THESIS-2018-024]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 138 pp. () [10.3204/PUBDB-2018-02949] = Dissertation, Universität Hamburg, 2018  GO
The topic of this thesis is a new approach to solve the DGLAP evolution equation to obtain not only the collinear Parton Distribution Functions (PDFs) but also the Transverse Momentum Dependent (TMD) PDFs (TMDs). The DGLAP equation is solved with the Parton Branching (PB) method, which allows a determination of kinematic variables at every branching and a construction of the TMDs in a large range in longitudinal momentum fraction $x$ and evolution scale $\mu^2$. [...]
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2018-08-07
18:46
[PUBDB-2018-02847] Dissertation / PhD Thesis
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Transient optical properties as a signature of structural changes within FEL irradiated solids
137 pp. () = Dissertation, University of Hamburg, 2017
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2018-08-07
12:02
OpenAccess [PUBDB-2018-02769] Book/Report/Dissertation / PhD Thesis
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Time development of hadronic showers in a Highly Granular Analog Hadron Calorimeter
[DESY-THESIS-2018-023]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 259 pp. () [10.3204/PUBDB-2018-02769] = Dissertation, Universität Hamburg, 2018  GO
This thesis presents the study of the time development of hadronic showers in a highly granular hadron calorimeter using data collected by the CALICE Analog Hadron Calorimeter (AHCAL) technological prototype at the Super Proton Synchrotron (SPS) at CERN in July 2015 in μ−, e− and hadron beams up to 90 GeV.Highly granular calorimeters are designed for the concept of Particle Flow Algorithm which aims to mea- sure each individual particle in a jet using the best sub-detector measurement. The Particle Flow approach is a key aspect of the detectors for the International Linear Collider (ILC) which is a future linear lepton collider designed for precision physics studies at a center of mass energy up to 500 GeV.The CALICE Collaboration is developing highly granular calorimeters for future colliders. [...]
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2018-07-30
14:12
OpenAccess [PUBDB-2018-02727] Book/Report/Dissertation / PhD Thesis

Next Generation PIRL for Surgery and Bio-Diagnostics
[DESY-THESIS-2018-021]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 139 pp. () [10.3204/PUBDB-2018-02727] = Dissertation, Universität Hamburg, 2018  GO
Recent studies show that scar-free surgery is possible with picosecondlaser pulses tuned to the strong absorption band of water in the Mid-IR. Away to generate these pulses is with an optical parametric amplifier (OPA)pumped by a picosecond infrared laser (PIRL). [...]
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2018-06-28
00:59
OpenAccess [PUBDB-2018-02408] Book/Report/Dissertation / PhD Thesis
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Measurements of differential cross sections for $t\bar{t}$ production in proton-proton collisions at $\sqrt{s} = 13$ TeV using events containing two leptons with the CMS experiment
[DESY-THESIS-2018-020]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 362 : figures, tables () [10.3204/PUBDB-2018-02408] = Dissertation, Universität Hamburg, 2018  GO
This work presents measurements of the normalized and absolute differential top-quark pair ($t\bar{t}$) production cross sections in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data were collected by the CMS experiment at the CERN LHC in 2016 and correspond to an integrated luminosity of 35.9 fb$^{-1}$. [...]
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2018-06-26
09:51
OpenAccess [PUBDB-2018-02379] Dissertation / PhD Thesis
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Exploration of the Higgs sector after its discovery
197 pp. () [10.3204/PUBDB-2018-02379] = Dissertation, Universitat Autonoma de Barcelona, 2018  GO
The discovery of the Higgs boson culminates a 40-year long hunt and completes a theoretical framework under which almost all collider data can be consistently explained. At the same time, paradoxically, the confirmation of an apparent mass gap above the electroweak scale exacerbates the problem of the electroweak hierarchy [...]
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2018-06-15
11:48
OpenAccess [PUBDB-2018-02286] Dissertation / PhD Thesis
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Integrated Waveguide Devices for Mode-Locked Lasers
134 pp. () [10.3204/PUBDB-2018-02286] = Dissertation, Massachusetts Institute of Technology, 2018  GO
Mode-locked lasers can provide a stable source of optical pulses with intrinsically low timing jitter, and as such have a broad range of important applications, both as sources of low-noise microwave signals and as the key enabling technology for optical frequency combs. Integrating such laser systems onto a chip using silicon photonics will dramatically reduce size and cost, thus increasing the accessibility of this technology for widespread deployment. [...]
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2018-06-12
09:04
OpenAccess [PUBDB-2018-02247] Book/Report/Dissertation / PhD Thesis
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Identification and Control of the Laser-based Synchronization System for the European X-ray Free Electron Laser
[DESY-THESIS-2018-018]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 164 pp. () [10.3204/PUBDB-2018-02247] = Dissertation, Technische Universität Hamburg, 2017  GO
The European X-ray Free-Electron Laser is currently under construction at theDeutsches ElektronenSynchrotron in Hamburg, Germany. This linear accelerator, with a length of 3.4 km,will generate extremely intense and short X-ray laser light pulses with a duration in the femtosecondrange and wavelengths down to 0.05 nm. [...]
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2018-06-11
16:51
OpenAccess [PUBDB-2018-02246] Book/Report/Dissertation / PhD Thesis
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On generalisations of the AGT correspondence for non-Lagrangian theories of class S
[DESY-THESIS-2018-019]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 254 pp. () [10.3204/PUBDB-2018-02246] = Dissertation, Universität Hamburg, 2018  GO
Non-perturbative aspects of N = 2 supersymmetric field theories of class S are deeply encoded in the algebra of functions on moduli spaces M-flat of flat SL(N)-connections on Riemann surfaces. Expectation values of Wilson and ’t Hooft supersymmetric line operators are related to holonomies of flat connections, while expectation values of line operators in the low energy effective theory are related to Fock-Goncharov coordinates on M-flat. [...]
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2018-06-11
13:56
OpenAccess [PUBDB-2018-02245] Book/Report/Dissertation / PhD Thesis
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Optimizing the design of the Final-Focus region for the International Linear Collider
[DESY-THESIS-2018-017; ETP-KA/2018-13]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 176 pp. () [10.5445/IR/1000083323] = Dissertation, Karlsruhe Institute of Technology (KIT), 2018  GO
The International Linear Collider (ILC) is a proposed linear electron positron collider with a center-of-mass energy of 250 GeV in its first stage. After the discovery of the Higgs boson at the Large Hadron Collider (LHC) at CERN in 2012, the physics goals of the ILC include the measurements of the Higgs boson properties and its interactions, but also measurements of the top quark and searches beyond the Standard Model are part of the ILC program in the different ILC stages. [...]
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