Preprints

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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
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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2017-04-24
12:46
OpenAccess [PUBDB-2017-01815] Preprint/Report

Optical Surface Properties and their RF Limitations of European XFEL Cavities
[DESY-17-060; arXiv:1704.06080]
 GO
The inner surface of superconducting cavities plays a crucial role to achieve highest accelerating fields and low losses. The industrial fabrication of cavities for the European X-Ray Free Electron Laser (XFEL) and the International Linear Collider (ILC) HiGrade Research Project allowed for an investigation of this interplay. [...]
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2017-04-24
11:36
OpenAccess [PUBDB-2017-01811] Preprint/Report
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Baryonic Higgs at the LHC
[DESY-17-050; arXiv:1704.03811]
We investigate the possible collider signatures of a new Higgs in simple extensions of the Standard Model where baryon number is a local symmetry spontaneously broken at the low scale. We refer to this new Higgs as 'Baryonic Higgs'. [...]
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2017-04-24
11:34
OpenAccess [PUBDB-2017-01810] Preprint/Report
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Factorization and Resummation for Massive Quark Effects in Exclusive Drell-Yan
[DESY-16-199; UWTHPH-2017-3; HU-EP-16-42; arXiv:1703.09702]
Exclusive differential spectra in color-singlet processes at hadron colliders are benchmark observables that have been studied to high precision in theory and experiment. We present an effective-theory framework utilizing soft-collinear effective theory to incorporate massive (bottom) quark effects into resummed differential distributions, accounting for both heavy-quark initiated primary contributions to the hard scattering process as well as secondary effects from gluons splitting into heavy-quark pairs. [...]
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2017-04-24
11:30
OpenAccess [PUBDB-2017-01809] Preprint/Report
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Dark matter self-interactions from a general spin-0 mediator
[DESY-17-052; arXiv:1704.02149]
Dark matter particles interacting via the exchange of very light spin-0 mediators can have large self-interaction rates and obtain their relic abundance from thermal freeze-out. At the same time, these models face strong bounds from direct and indirect probes of dark matter as well as a number of constraints on the properties of the mediator. [...]
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2017-04-24
11:24
OpenAccess [PUBDB-2017-01808] Preprint/Report
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The leptonic future of the Higgs
[DESY-17-018; arXiv:1704.02333]
Precision study of electroweak symmetry breaking strongly motivates the construction of a lepton collider with center-of-mass energy of at least 240 GeV. Besides Higgsstrahlung ($e^+e^- \to hZ$), such a collider would measure weak boson pair production ($e^+e^- \to WW$) with astonishing precision. [...]
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