Reports

Latest additions:
2017-04-26
13:10
OpenAccess [PUBDB-2017-01934] Book/Report/Dissertation / PhD Thesis
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Large-scale laser-microwave synchronization for attosecond photon science facilities
[DESY-THESIS-2017-015]
DESY-THESIS 134 pp., (2017) [10.3204/PUBDB-2017-01934]  GO
Low-noise transfer of time and frequency standards over large distances provides high temporal resolution for ambitious scientific explorations such as sensitive imaging of astronomical objects using multi-telescope arrays, comparison of distant optical clocks or gravitational-wave detection using large laser interferometers. In particular, rapidly expanding photon science facilities such as X-ray free-electron lasers (FELs) and attoscience centers have the most challenging synchronization requirements of sub-fs timing precision to generate ultrashort X-ray pulses for the benefit of creating super-microscopes with sub-atomic spatiotemporal resolution. [...]
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2017-04-25
14:46
OpenAccess [PUBDB-2017-01883] Preprint/Report
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Analysis of the cool down related cavity performance of the European XFEL vertical acceptance tests
[arXiv:1609.06503]
 GO
It has been reported that the cool down dynamics across $T_c$ has a significant influence on the observed quality factors $Q_0$ of a cavity, which is most likely due to trapped flux. In this document we show the results of the investigation if such a correlation can be observed during the European XFEL cavity production..
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2017-04-24
14:34
OpenAccess [PUBDB-2017-01838] Report/Journal Article
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Flavor mixings in flux compactifications
[DESY-16-238; arXiv:1701.06935] ddc:530
A multiplicity of quark-lepton families can naturally arise as zero-modes in flux compactifications. The flavour structure of quark and lepton mass matrices is then determined by the wave function profiles of the zero-modes. [...]
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2017-04-24
14:32
OpenAccess [PUBDB-2017-01837] Report/Journal Article
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Bootstrapping $\mathcal{N} = 3$ superconformal theories
[DESY-16-237] ddc:530
We initiate the bootstrap program for $\mathcal{N} = 3$ superconformal field theories (SCFTs) in four dimensions. The problem is considered from two fronts: the protected subsector described by a 2d chiral algebra, and crossing symmetry for half-BPS operators whose superconformal primaries parametrize the Coulomb branch of $\mathcal{N} = 3$ theories [...]
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2017-04-24
14:27
OpenAccess [PUBDB-2017-01835] Report/Journal Article
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Effective field theory for magnetic compactifications
[CPHT-RR047.112016; DESY-16-206; arXiv:1611.03798] ddc:530
Magnetic flux plays an important role in compactifications of field and string theories in two ways, it generates a multiplicity of chiral fermion zero modes and it can break supersymmetry. We derive the complete four-dimensional effective action for $\mathcal{N}=1$ supersymmetric Abelian and non-Abelian gauge theories in six dimensions compactified on a torus with flux. [...]
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2017-04-24
14:23
OpenAccess [PUBDB-2017-01833] Report/Journal Article
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Exploring the nearly degenerate stop region with sbottom decays
[DESY-16-101; arXiv:1611.09868; CALT-TH-2016-036] ddc:530
A light stop with mass almost degenerate with the lightest neutralino has important connections with both naturalness and dark matter relic abundance. This region is also very hard to probe at colliders [...]
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2017-04-24
13:00
OpenAccess [PUBDB-2017-01822] Preprint/Report
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Generic calculation of two-body partial decay widths at the full one-loop level
[DESY-17-042; KA-TP-11-2017; arXiv:1703.09237]
 GO
We describe a fully generic implementation of two-body partial decay widths at the full one-loop level in the SARAH and SPheno framework compatible with most supported models. It incorporates fermionic decays to a fermion and a scalar or a gauge boson as well as scalar decays into two fermions, two gauge bosons, two scalars or a scalar and a gauge boson. [...]
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2017-04-24
12:57
OpenAccess [PUBDB-2017-01820] Preprint/Report
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A global view on the Higgs self-coupling
[DESY-17-044; arXiv:1704.01953]
The Higgs self-coupling is notoriously intangible at the LHC. It was recently proposed to probe the trilinear Higgs interaction through its radiative corrections to single-Higgs processes. [...]
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2017-04-24
12:53
OpenAccess [PUBDB-2017-01818] Preprint/Report
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Minimally extended SILH
[DESY-17-049; IFIC-17-15; FTUV-17-0322.9647; arXiv:1703.10624]
Higgs boson compositeness is a phenomenologically viable scenario addressing the hierarchy problem. In minimal models, the Higgs boson is the only degree of freedom of the strong sector below the strong interaction scale. [...]
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2017-04-24
12:48
OpenAccess [PUBDB-2017-01816] Preprint/Report

Automated Optical Inspection and Image Analysis of Superconducting Radio-Frequency Cavities
[DESY-17-061; arXiv:1704.06081]
 GO
The inner surface of superconducting cavities plays a crucial role to achieve highest accelerating fields and low losses. For an investigation of this inner surface of more than 100 cavities within the cavity fabrication for the European XFEL and the ILC HiGrade Research Project, an optical inspection robot OBACHT was constructed. [...]
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