Books

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2019-05-23
14:17
OpenAccess [PUBDB-2019-02359] Book/Report/Master Thesis

Systematic Studies of a Cavity Quench Localization System
[DESY-THESIS-2019-010]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 120 pp. () [10.3204/PUBDB-2019-02359] = Masterarbeit, Universität Hamburg, 2019  GO
Several tools for quench localization at Superconducting Radio Frequency cavities exist. One of these techniques uses the excitation of temperature waves in liquid Helium below the lambda point. [...]
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2019-05-07
13:39
OpenAccess [PUBDB-2019-02167] Book/Report/Dissertation / PhD Thesis

Tau Lepton: As a Tool for Hunting Standard Model and Beyond Standard Model Higgs
[DESY-THESIS-2019-009]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 189 pp. () [10.3204/PUBDB-2019-02167] = Dissertation, Universität Hamburg, 2019  GO
This thesis presents a study of the Standard Model (SM) Higgs boson in the decay channelof ! eμ, as well as a search for neutral Minimal Supersymmetric Standard Model (MSSM)Higgs boson in the same decay channel, using data corresponding to an integrated luminosityof 35.9 fb−1 in proton-proton collisions with a center-of-mass energy of 13 TeV, collected bythe CMS detector at the Large Hadron Collider. The results of eμ channel in both analysesare combined with other channels of Higgs to decay: eh, μh and hh.An observation of the SM Higgs boson to is established with a significance of 4.9 standarddeviations, to be compared to an expected significance of 4.7 standard deviations [...]
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2019-05-06
14:03
OpenAccess [PUBDB-2019-02142] Book/Report/Dissertation / PhD Thesis

Astrophysical Implications of Self-interacting Dark Matter
[DESY-THESIS-2019-008]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 127 pp. () [10.3204/PUBDB-2019-02142] = Dissertation, Universität Hamburg, 2019  GO
In this thesis we study the astrophysical implication of self-interacting dark matter. Observations on different scales suggest the existence of an additional form of matter which interacts gravitationally. [...]
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2019-04-29
11:00
OpenAccess [PUBDB-2019-02112] Book/Internal Report

Veröffentlichungen am DESY 2018
Publikationen für Zentrenfortschrittsbericht 64 p. () [10.3204/PUBDB-2019-02112]  GO
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2019-04-02
08:07
OpenAccess [PUBDB-2019-01791] Book/Report/Dissertation / PhD Thesis

Numerical beam stability studies in external injection plasma-wakefield acceleration regimes
[DESY-THESIS-2019-005]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 177 pp. () [10.3204/PUBDB-2019-01791] = Dissertation, Universität Hamburg, 2019  GO
This work considers the phase-space evolution of an externally injectedelectron beam under various plasma-based acceleration scenariosusing numerical methods.Plasma wakefield acceleration, an exceptional technology with thepotential to drive the next generation of particle accelerators, uses aparticle driver to excite a wakefield carrying gradients in the rangeof10 GV m−1to100 GV m−1, orders of magnitude higher than theconventional cavities currently available. However, the plasma envi-ronment has stringent requirements with respect to acceptable beamparameters which need to be carefully analyzed to enable stable beamtransport and acceleration. [...]
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2019-03-29
09:13
OpenAccess [PUBDB-2019-01768] Book/Report/Dissertation / PhD Thesis

Flavour cosmology: Electroweak baryogenesis from varying Yukawas
[DESY-THESIS-2019-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 168 pp. () [10.3204/PUBDB-2019-01768] = Dissertation, Universität Hamburg, 2018  GO
Despite its outstanding phenomenological successes, the Standard Model of particle physicshas a number of severe shortcomings. In this thesis, I address some of the most strikingof these. [...]
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2019-03-15
10:39
OpenAccess [PUBDB-2019-01556] Book/Report/Dissertation / PhD Thesis

Study of self-modulation of an electron beam in plasma
[DESY-THESIS-2019-003]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 142 pp. () [10.3204/PUBDB-2019-01556] = Dissertation, University of Hamburg, 2018  GO
The acceleration of electron beams in plasma wakefields driven by charged particlebeams is among the most promising candidates for future TeV-scale compact electronaccelerators. Currently available high energy proton beams that could serve as driverbeams in a plasma wakefeld accelerator (PWFA) are much longer than what is requiredfor efficient excitation of high-amplitude wakefields and thus for generating the desiredhigh acceleration gradients. [...]
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2019-02-20
14:25
OpenAccess [PUBDB-2019-01182] Book/Report/Dissertation / PhD Thesis

Search for high mass higgs bosons in the final state with $b$-quarks with the CMS 2016 data
[DESY-THESIS-2019-002]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 216 pp. () [10.3204/PUBDB-2019-01182] = Dissertation, Universität Hamburg, 2019  GO
A search for high mass Higgs bosons produced in association with at least one $b$-quark and decaying into a pair of $b$-quarks using the LHC Run 2 data collected by the CMS detector is presented. The corresponding data sample was accumulated during the proton-proton collisions in 2016 at a centre-of-mass energy of $\sqrt{s} = 13$ TeV, corresponding to an integrated luminosity of 35.7 fb$^{-1}$.An extended Higgs sector containing high mass Higgs states is predicted by many theories beyond the Standard Model, such as a general two Higgs doublet model (2HDM) and its realization in the Minimal Supersymmetric extension of the Standard Model (MSSM).In many scenarios within these models Higgs couplings to $b$-quarks are significantly enhanced and therefore the final state exploited in this work is of particular interest.From the experimental point of view this final state leads to at least three highly energetic $b$-jets in the event, of which the two with the highest transverse momentum, are assumed to originate from the Higgs boson decay and another one comes from the associated production mechanism. [...]
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2019-01-29
15:40
OpenAccess [PUBDB-2019-00851] Book/Report/Dissertation / PhD Thesis

Diffraction anomalous fine structure in Laue geometry
[DESY-THESIS-2018-043]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 108 pp. () [10.3204/PUBDB-2019-00851] = Dissertation, Universität Hamburg, 2016  GO
This thesis deals with the further development of the method of Borrmannspectroscopy and the development of the novel method of diffractionanomalous fine structure in Laue geometry.Borrmann spectroscopy utilizes the Borrmann effect in order to enhancethe quadrupol absorption, which enables studying weak quadrupoltransitions. In the present work a model is developed, which describes thedependence of the quadrupol enhancement on temperature and anisotropyof the chemical environment. [...]
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2019-01-17
10:15
OpenAccess [PUBDB-2019-00540] Book/Report/Dissertation / PhD Thesis

High repetition rate THz characterization at 4th generation X-Ray light sources
[DESY-THESIS-2019-001]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 266 pp. () [10.3204/PUBDB-2019-00540] = Dissertation, Universität Hamburg, 2018  GO
Within this work a wholesome approach to the characterization of FEL based THz radiationis made on the example of the THz radiation provided at the THz beamline at Flash thefree electron laser at DESY in Hamburg. A SRW based model of the THz generation froma free electron and the corresponding transport is developed and used to gain insight intothe complex intensity profile created by the interplay of the THz undulator and variousmagnetic edges. [...]
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