Ph.D. Theses

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2022-09-19
14:43
OpenAccess [PUBDB-2022-04804] Book/Dissertation / PhD Thesis
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Towards global interpretation of LHC data: SM and EFT couplings from jet and top quark measurements at CMS
[DESY-THESIS-2022-017]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 213 pages: Illustrations, figures () [10.3204/PUBDB-2022-04804] = Dissertation, Universität Hamburg, 2022  GO
This thesis presents the first global interpretation of the measurements of doubledifferentialcross sections of inclusive jet and top quark-antiquark pair (tt) productionin proton-proton collisions at the Large Hadron Collider (LHC) at the center ofmass energy of √s = 13TeV, together with inclusive measurements in Deep Inelasticelectron-proton Scattering (DIS) at HERA. The LHC data have been recordedby the Compact Muon Solenoid (CMS) experiment in 2016, and correspond to theintegrated luminosity of 33.5 fb−1 for inclusive jet measurement or 35.9 fb−1 for the ttmeasurement.This novel analysis is performed at next-to-leading order (NLO) of perturbative quantumchromodynamics (QCD), where the inclusive neutral and charged current DISmeasurements at HERA, the CMS jet measurements and the normalized triple-differentialcross sections of tt production are used together to constrain the parametersof QCD and impose constraints on new physics. [...]
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2022-09-19
09:36
OpenAccess [PUBDB-2022-04798] Book/Dissertation / PhD Thesis
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First differential measurements of tZq production and luminosity determination using Z boson rates at the LHC
[DESY-THESIS-2022-018]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 210 pp. () [10.3204/PUBDB-2022-04798] = Dissertation, Universität Hamburg, 2022  GO
In this thesis, measurements are presented using proton-proton collision data at s =13 TeV collected by the CMS experiment in the years 2016, 2017, and 2018, corresponding to an integrated luminosity of 138 fb−1. New results on single top quark production in association with a Z boson (tZq) are presented. [...]
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2022-09-06
14:32
[PUBDB-2022-04696] Dissertation / PhD Thesis
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Photoproduktion der neutralen Vector-Mesonen $\rho^0$ und $\phi$ in Vorwärtsrichtung an verschiedenen Atomkernen
[SLAC-TRANS-0092]
117 pp. () = Dissertation, University of Hamburg, 1968  GO
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2022-08-15
21:04
OpenAccess [PUBDB-2022-04411] Book/Dissertation / PhD Thesis
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Massive 2- and 3-loop corrections to hard scattering processes in QCD
[DESY-THESIS-2022-016]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 258 pp. () [10.3204/PUBDB-2022-04411] = Dissertation, Universität Hamburg, 2022  GO
This thesis deals with calculations of higher-order corrections in perturbative quantum chromodynamics(QCD). The two-mass contributions to the 3-loop, polarized twist-two operator matrixelements (OMEs) A(3),PSQq and A(3)gg,Q are calculated. [...]
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2022-08-11
14:05
OpenAccess [PUBDB-2022-04355] Dissertation / PhD Thesis
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Electric-magnetic duality invariance implications for axion physics
130 pp. () [10.3204/PUBDB-2022-04355] = Dissertation, University of Hamburg, 2022  GO
Axions and axion-like particles are very well-motivated candidates for physics beyond the Standard model, which can be probed by multiple existing and projected experiments and astrophysical observations. Theoretical determination of the relevant low energy axion interactions is essential for guiding the corresponding experimental and observational efforts. [...]
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2022-08-08
11:08
OpenAccess [PUBDB-2022-04259] Dissertation / PhD Thesis
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Free electron laser pulse characterization by THz streaking
130 pp. () [10.3204/PUBDB-2022-04259] = Dissertation, University of Hamburg, 2022  GO
he goal of this dissertation was to investigate a reliable single-shot pulse duration diagnostic tool for the pulse duration and wavelength range delivered at the Free Electron LAser of Hamburg (FLASH). At Self-Amplified-Spontaneous-Emission-based free-electron lasers (FELs), the radiation parameters - duration, arrival time, energy, spectrum, and spatial distribution - differ for each pulse [...]
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2022-08-05
16:49
OpenAccess [PUBDB-2022-04255] Book/Dissertation / PhD Thesis
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Measurement of multi-differential dijet cross sections in pp collisions at $\sqrt{s}$ = 13 TeV.
[DESY-THESIS-2022-015]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 237 pp. () [10.3204/PUBDB-2022-04255] = Dissertation, University of Hamburg, 2022  GO
The understanding of the theory of strong interactions in the context of the Standard Model is of great interest to particle physics and its developments. The measurements andthe improvement of the theoretical predictions would allow us to get closer to future findings of new physics by discriminating better between backgrounds produced mainly by stronginteractions. [...]
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2022-07-12
15:19
OpenAccess [PUBDB-2022-03838] Dissertation / PhD Thesis
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Anomalous dimensions of composite operators for off-forward hard scattering processes
150 pp. () [10.3204/PUBDB-2022-03838] = Dissertation, University of Hamburg, 2022  GO
We consider the renormalization of operator matrix elements for exclusive hard scattering processes in the chiral limit in the $\overline{\text{MS}}$-scheme. For such processes, mixing with total derivative operators has to be taken into account. [...]
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2022-07-11
12:04
OpenAccess [PUBDB-2022-03578] Book/Dissertation / PhD Thesis
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Time-Resolved Phase-Space Characterisation of Plasma-Wakefield-Accelerated Electrons at FLASHForward
[DESY-THESIS-2022-014]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 262 pp. () [10.3204/PUBDB-2022-03578] = Dissertation, Universität Hamburg, 2022  GO
A plasma can sustain electric fields orders of magnitude larger than those attainable with the conventional radio-frequency (RF) technology typically used in particle accelerators, which are limited to ∼ 100 MV/m due to electrical breakdowns occurring at the metallic boundary of the accelerating structures. In a particle-beam-driven plasma-wakefield accelerator (PWFA), a charge-density wake sustaining field gradients in excess of GV/m is driven by the passage of a relativistic high-intensity particle bunch through a plasma. [...]
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2022-07-06
13:14
OpenAccess [PUBDB-2022-03557] Book/Dissertation / PhD Thesis
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Measurement of the differential cross section of W and Z bosons in the boosted region in proton-proton collisions with the CMS experiment
[DESY-THESIS-2022-013]
Hamburg : Verlag Deutsches Elektronen-Synchrotron DESY, DESY-THESIS 201 pp. () [10.3204/PUBDB-2022-03557] = Dissertation, Universität Hamburg, 2021  GO
In this thesis, a measurement of the differential cross section for hadronically decayingW and Z bosons produced in proton-proton collisions is presented. Decay productsof the vector bosons with very high transverse momentum pT are collimated in themomentum direction of the mother particle and are merged into a large cone-size jetwith the characteristic inner structure. [...]
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