OpenAccess

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2018-09-21
11:17
OpenAccess [PUBDB-2018-03555] Preprint/Report
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Numerical Implementation of Harmonic Polylogarithms to Weight w = 8
[DESY-13-064; DO-TH-17-12; arXiv:1809.07084]
 GO
We present the FORTRAN-code HPOLY.f for the numerical calculation of harmonic polylogarithms up to w = 8 at an absolute accuracy of $\sim 4.9 \cdot 10^{-15}$ or better. Using algebraic and argument relations the numerical representation can be limited to the range $x \in [0, \sqrt{2}-1]$. [...]
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2018-09-20
13:59
OpenAccess [PUBDB-2018-03551] Preprint/Report
; ; ; et al
Performance of reconstruction and identification of $\tau$ leptons decaying to hadrons and $\nu_\tau$ in pp collisions at $\sqrt{s}=$ 13 TeV
[CMS-TAU-16-003; CERN-EP-2018-229; arXiv:1809.02816]
 GO
The algorithm developed by the CMS Collaboration to reconstruct and identify $\tau$ leptons produced in proton-proton collisions at $\sqrt{s}=$ 7 and 8 TeV, via their decays to hadrons and a neutrino, has been significantly improved. The changes include a revised reconstruction of $\pi^0$ candidates, and improvements in multivariate discriminants to separate $\tau$ leptons from jets and electrons. [...]
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2018-09-20
11:18
OpenAccess [PUBDB-2018-03549] Journal Article
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In-Situ Synchrotron X-Ray Diffraction Studies in the Chip Formation Zone During Orthogonal Metal Cutting
Residual Stresses 2018, ECRS-10 , LeuvenLeuven, Belgium, 11 Sep 2018 - 14 Sep 20182018-09-112018-09-14 Materials research proceedings 6, 39 - 44 () [10.21741/9781945291890-7]  GO
Abstract. In the field of metal cutting a very important parameter is the chip formation zone, where the workpiece, the cutting tool and the chip are in contact [...]
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ddc:620
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2018-09-20
10:41
OpenAccess [PUBDB-2018-03548] Contribution to a conference proceedings/Contribution to a book
; ; ; et al
$K$-edge absorption spectra of gaseous hydrides
European Conference on X-Ray Spectrometry, EXRS-2018, LjubljanaLjubljana, Slovenia, 24 Jun 2018 - 29 Jun 20182018-06-242018-06-29 66-66 () [10.3204/PUBDB-2018-03548]  GO
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2018-09-18
15:07
OpenAccess [PUBDB-2018-03533] Journal Article
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Correlative microscopy approach for biology using X-ray holography, X-ray scanning diffraction and STED microscopy
We present a correlative microscopy approach for biology based on holographic X-ray imaging, X-ray scanning diffraction, and stimulated emission depletion (STED) microscopy. All modalities are combined into the same synchrotron endstation. [...]
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ddc:500
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2018-09-18
10:46
OpenAccess [PUBDB-2018-03526] Preprint/Report
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Computer algebra tools for Feynman integrals and related multi-sums
[DESY-18-160; DO-TH-18-21; arXiv:1809.06168]
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In perturbative calculations, e.g., in the setting of Quantum Chromodynamics (QCD) one aims at the evaluation of Feynman integrals. Here one is often faced with the problem to simplify multiple nested integrals or sums to expressions in terms of indefinite nested integrals or sums. [...]
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2018-09-17
16:37
OpenAccess [PUBDB-2018-03525] Preprint/Report
; ; ; et al
Determination and application of TMD parton densities using the Parton Branching method
[DESY-18-156; arXiv:1809.04511]
 GO
We present a determination of parton densities at NLO obtained with the Parton Branching method using precision measurements of deep inelastic scattering cross sections at HERA. The two sets of parton densities shown in this work are obtained with the same angular angular ordering condition for the evolution scale and they differ in the chosen scale for the strong coupling evaluation, for which we consider two scenarios: the evolution scale, and the transverse momentum qT from the angular ordering prescription. [...]
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2018-09-17
15:15
OpenAccess [PUBDB-2018-03522] Contribution to a conference proceedings/Contribution to a book
; ; ; et al
X-ray spectrometry in plant biology
European Conference on X-Ray Spectrometry, EXRS-2018, LjubljanaLjubljana, Slovenia, 24 Jun 2018 - 29 Jun 20182018-06-242018-06-29 238-238 () [10.3204/PUBDB-2018-03522]  GO
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2018-09-17
15:01
OpenAccess [PUBDB-2018-03520] Preprint/Report
; ; ; et al
Calculation of the Z+jet cross section including transverse momenta of initial partons
[arXiv:1809.03854; DESY 18-159; IFJPAN-IV-2018-16; CERN-TH-2018-204]
 GO
We perform calculations of Z+jet cross-section taking into account the transverse momenta of the initial partons. Transverse Momentum Dependent (TMD) parton densities obtained with the Parton Branching method are used and higher order corrections are included via TMD parton showers in the initial state. [...]
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2018-09-14
16:46
OpenAccess [PUBDB-2018-03513] Poster

Decay Chain Reconstruction in Belle II
23rd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2018, National Palace of CultureSofia, National Palace of Culture, Bulgaria, 9 Jul 2018 - 13 Jul 20182018-07-092018-07-13  GO
The Belle II detector will begin its data taking phase in 2018. Featuring a state of the art vertex detector with innovative pixel sensors, it will record collisions of e+e- beams from the SuperKEKB accelerator which is slated to provide luminosities 40x higher than KEKB.This large amount of data will come at the price of an increased beam background, as well as an operating point providing a lowered Lorentz boost when compared to Belle.This leads to new challenges for analysts seeking to perform precision measurements, as increasingly precise vertex position reconstruction and background rejection power is needed to take advantage of the unprecedented statistics provided. [...]
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