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2020-07-21
16:40
OpenAccess [PUBDB-2020-02805] Journal Article
et al
A New Precision Process at FCC-hh: the diphoton leptonic Wh channel
[DESY-20-054; ZU-TH 09/20; arXiv:2004.06122]
The increase in luminosity and center of mass energy at the FCC-hh will open up new clean channels where BSM contributions are enhanced at high energy. In this paper we study one such channel, Wh → ℓνγγ. [...]
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2020-07-20
15:05
OpenAccess [PUBDB-2020-02797] Book/Dissertation / PhD Thesis

Untersuchung der Photoelektronen-Winkelverteilungen von ausgerichteten Molekülen in der Gasphase
[DESY-THESIS-2020-018]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 206 pp. () [10.3204/PUBDB-2020-02797] = Dissertation, Universität Hamburg, 2020  GO
This work investigates if and how photoelectron diffraction might become a suitable tool to measure structural changes of small molecules in the gas-phase with femtosecond temporal and angstrom spatial resolution. Molecular-frame photoelectron angular distributions (MFPAD) of O(1$s$)-, S(2$p$)- and F(1$s$)-electrons from carbonyl sulfide and fluoromethane molecules have been measured in photoelectron-photoion coincidence experiments at the synchrotron radiation sources DORIS and PETRA III (kinetic energy of photoelectrons: 16 eV < E$_{\mathrm{PE}}$ < 283 eV). [...]
OpenAccess: Dissertation Denis Anielski final - Download fulltextPDF Download fulltextPDF (PDFA); desy-thesis-20-018.title - Download fulltextPDF Download fulltextPDF (PDFA);

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2020-07-16
11:57
OpenAccess [PUBDB-2020-02782] Journal Article

Quiver $\text{W}_{\epsilon_1,\epsilon_2}$ algebras of 4d $\mathcal{N}=2$ gauge theories
[DESY-19-233; ITEP-36/19; arXiv:1912.09969]
We construct an ϵ-deformation of W algebras, corresponding to the additive version of quiver algebras which feature prominently in the 5D version of the BPS/CFT correspondence and refined topological strings on toric Calabi–Yau’s. This new type of algebras fill in the missing intermediate level between q-deformed and ordinary W algebras. [...]
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2020-07-16
11:52
OpenAccess [PUBDB-2020-02781] Journal Article

4D $\mathcal{N}=2$ SCFTs and spin chains
[DESY-19-212; arXiv:1912.00870]
This is the writeup of the lectures given at the Winter School ‘YRISW 2018’ to appear in a special issue of J. Phys. [...]
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2020-07-16
11:47
OpenAccess [PUBDB-2020-02780] Journal Article

BSM with Cosmic Strings: Heavy, up to EeV mass, Unstable Particles
[DESY-19-206; arXiv:1912.03245]
Unstable heavy particles well above the TeV scale are unaccessible experimentally. So far, Big-Bang Nucleosynthesis (BBN) provides the strongest limits on their mass and lifetime, the latter being shorter than 0.1 second. [...]
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2020-07-16
11:41
OpenAccess [PUBDB-2020-02779] Journal Article

A Practical and Consistent Parametrization of Dark Matter Self-Interactions
[DESY-19-137; arXiv:1908.06067]
Self-interacting dark matter has been proposed to explain the apparent mass deficit in astrophysical small-scale halos, while observations from galaxy clusters suggest that the corresponding cross section depends on the velocity. Accounting for this is often believed to be highly model-dependent with studies mostly focusing on scenarios with light mediators. [...]
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2020-07-15
13:30
OpenAccess [PUBDB-2020-02774] Journal Article
et al
Single-shot transverse coherence measurements with Young's double pinholes at FLASH2
We measured the transverse coherence at FLASH2, a variable gap undulator line at the FLASH free-electron laser user facility at DESY in Hamburg. We demonstrate, theoretically and experimentally, a revised version of Young's double pinhole approach to perform single-shot, repeatable and non-invasive transverse coherence measurements. [...]
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2020-07-15
05:53
Embargoed OpenAccess [PUBDB-2020-02760] Journal Article
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A resistively-heated dynamic diamond anvil cell (RHdDAC) for fast compression x-ray diffraction experiments at high temperatures
A resistively-heated dynamic diamond anvil cell (RHdDAC) setup is presented. The setup enables the dynamic compression of samples at high temperatures by employing a piezoelectric actuator for pressure control and internal heaters for high temperature. [...]
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2020-07-14
16:54
OpenAccess [PUBDB-2020-02758] Journal Article
et al
Influence of Ring Contraction on the Electronic Structure of Nickel Tetrapyrrole Complexes: Corrole vs Porphyrin
The influence of the contracted corrole macrocycle, in comparison to the larger porphyrin macrocycle, on the electronic structure of nickel was studied with X-ray and ultraviolet photoelectron spectroscopy (XPS, UPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. Synthesis and in situ characterization of the Ni complexes of octaethylporphyrin (NiOEP) and hexaethyldimethylcorrole (NiHEDMC) were performed in ultra-high vacuum. [...]
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2020-07-14
15:33
OpenAccess [PUBDB-2020-02751] Journal Article
et al
Importance of Methane Chemical Potential for Its Conversion to Methanol on Cu‐Exchanged Mordenite
Copper‐oxo clusters exchanged in zeolite mordenite are active in the stoichiometric conversion of methane to methanol at low temperatures. Here, we show an unprecedented methanol yield per Cu of 0.6, with a 90–95 % selectivity, on a MOR solely containing [Cu$_3$($\mu$‐O)$_3$]$^{2+ }$active sites. [...]
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