Publications database

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2018-01-19
13:34
DBCoverage [PUBDB-2018-00697] Report/Journal Article
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The two-mass contribution to the three-loop pure singlet operator matrix element
[DESY-17-195; DO-TH-17-32; arXiv:1711.06717] ddc:530
We present the two-mass QCD contributions to the pure singlet operator matrix element at three loop order in x-space. These terms are relevant for calculating the structure function $F_2(x,Q^2)$ at $O(\alpha_s^3)$ as well as for the matching relations in the variable flavor number scheme and the heavy quark distribution functions at the same order. [...]
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2018-01-18
16:15
OpenAccess [PUBDB-2018-00694] Preprint/Report
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Resummation of Goldstone Infrared Divergences: A Proof to All Orders
[DESY-17-226; arXiv:1712.08068]
 GO
The perturbative effective potential calculated in Landau gauge suffers from infrared problems due to Goldstone boson loops. These divergences are spurious and can be removed by a resummation procedure that amounts to a shift of the mass of soft Goldstones. [...]
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2018-01-18
15:05
OpenAccess [PUBDB-2018-00693] Conference Presentation

Integrated Photonics to the Rescue of Femtosecond Beam Diagnostics
International Beam Instrumentation Conference, IBIC 17, Meeting locationGrand Rapids, Michigan, USA, 20 Aug 2017 - 24 Aug 20172017-08-202017-08-24  GO
Beam instrumentation has always been using results from neighbouring communities. Over the last 10 years, a number of beam instruments and systems have successfullyadopted optical solutions, pushing performances from ps to fs, exploiting optical set-ups or photonic components. [...]
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2018-01-18
12:04
OpenAccess [PUBDB-2018-00689] Dissertation / PhD Thesis

Measurements of top-quark properties at 8 TeV using the ATLAS detector at the LHC
229 pp. (2017) [10.3204/PUBDB-2018-00689] = Dissertation, Bergische Universität Wuppertal, 2017  GO
This work presents the measurements of the charge asymmetry and top quark spin observables in ttbar events based on 20.3 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV proton--proton collisions recorded with the ATLAS detector at the LHC. These analyses are performed in the dilepton final state, characterized by the presence of two isolated leptons (electrons or muons). [...]
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2018-01-18
11:34
OpenAccess [PUBDB-2018-00686] Contribution to a conference proceedings/Contribution to a book
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Material Tests for the ILC Positron Source
8th International Particle Accelerator Conference, IPAC 2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 Geneva : JACoW, 1293-1295 (2017) [10.3204/PUBDB-2018-00686]  GO
The positron source is a vital system of the ILC. The conversion target that yields about 10$^{14}$ positrons per second will undergo high peak and cyclic load during ILC operation. [...]
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2018-01-18
11:22
OpenAccess [PUBDB-2018-00685] Journal Article/Contribution to a conference proceedings
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Quark and Gluon iTMD parton distributions from HERA DIS data
38th International Conference on High Energy Physics, ICHEP2016, Meeting locationChicago, USA, 3 Aug 2016 - 10 Aug 20162016-08-032016-08-10 Proceedings of Science (ICHEP2016), 961 (2016) [10.3204/PUBDB-2018-00685]  GO
ddc:530
We describe a new approach to solve coupled quark and gluon DGLAP evolution equations with a Monte Carlo method. We show that this method is equivalent to other semi-analytical methods [...]
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2018-01-18
10:49
[PUBDB-2018-00684] Journal Article
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High-strength Mg-6Zn-1Y-1Ca (wt%) alloy containing quasicrystalline I-phase processed by a powder metallurgy route
ddc:600
A high-strength Mg-6Zn-1Y-1Ca (wt%) alloy has been processed by a powder metallurgy route. Rapidly solidifiedpowders with a particle size below 100 μm were used as a way for preventing formation of ternaryMgZnCa compounds during subsequent extrusion at 250 °C. [...]
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2018-01-17
16:46
OpenAccess [PUBDB-2018-00682] Contribution to a conference proceedings/Contribution to a book
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Fast Image Analysis for Beam Profile Measurement at the European XFEL
16th International Conference on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Jan 20182017-10-082018-01-13 JACoW, 4 pp. (2017) [10.3204/PUBDB-2018-00682]  GO
At the European XFEL, images of scintillator screens are processed at a rate of 10 Hz. Dedicated image analysis servers are used for transversal beam profile analysis as well as for longitudinal profile and slice emittance measurement [...]
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2018-01-17
16:42
OpenAccess [PUBDB-2018-00680] Contribution to a conference proceedings/Contribution to a book

RF-Energy Management for the European XFEL
16th International Conference on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Oct 20172017-10-082017-10-13 JACoW, 3 pp. (2017) [10.3204/PUBDB-2018-00680]  GO
The European XFEL is in its commissioning phase at this time. One of the major tasks is to bring up all the 25 installed RF-stations, which will allow for a beam energy of up to 17.5 GeV [...]
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2018-01-17
16:39
OpenAccess [PUBDB-2018-00679] Contribution to a conference proceedings/Contribution to a book

Using Color Blindness Simulator During User Interface Development for Accelerator Control Room Applications
16th International Conference on Accelerator and Large Experimental Control Systems ICALEPCS 2017, ICALEPCS2017, Meeting locationBarcelona, Spain, 8 Oct 2017 - 13 Oct 20172017-10-082017-10-13 JACoW, 6 pp. (2017) [10.3204/PUBDB-2018-00679]  GO
For normally sighted developers it is hard to imagine how the user interface is going to look to a color blind person. Our purpose is to draw attention to people with color blindness and to consider their color vision [...]
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