# Publications database

 2018-09-2111:17 [PUBDB-2018-03555] Preprint/Report et al Numerical Implementation of Harmonic Polylogarithms to Weight w = 8 [DESY-13-064; DO-TH-17-12; arXiv:1809.07084]   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 $x \in [0, \sqrt{2}-1]$. [...] OpenAccess: PDF PDF (PDFA); 2018-09-2013:59 [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]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-09-2011:18 [PUBDB-2018-03549] Journal Article et al 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 2018 Materials research proceedings 6, 39 - 44 (2018) [10.21741/9781945291890-7]   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 [...] OpenAccess: PDF PDF (PDFA); 2018-09-2010:41 [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 2018 66-66 (2018) [10.3204/PUBDB-2018-03548]   OpenAccess: PDF PDF (PDFA); 2018-09-1815:07 [PUBDB-2018-03533] Journal Article et al Correlative microscopy approach for biology using X-ray holography, X-ray scanning diffraction and STED microscopy Nature Communications 9(1), 3641 (2018) [10.1038/s41467-018-05885-z]   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. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2018-09-1810:46 [PUBDB-2018-03526] Preprint/Report Schneider, C. Computer algebra tools for Feynman integrals and related multi-sums [DESY-18-160; DO-TH-18-21; arXiv:1809.06168]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-09-1716:37 [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]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-09-1715:15 [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 2018 238-238 (2018) [10.3204/PUBDB-2018-03522]   OpenAccess: PDF PDF (PDFA); External link: Fulltext 2018-09-1715:01 [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]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-09-1712:23 [PUBDB-2018-03517] Journal Article et al Hard X-ray induced fast secondary electron cascading processes in solids Applied physics letters 113(11), 114102 (2018) [10.1063/1.5046070]   Recent studies confirmed that the materials used in the extreme UV and soft X-ray regime for precise characterization of intense free-electron laser pulses (e.g., Si$_3$N$_4$) do not work efficiently in the hard X-ray regime, which is due to the fact that the impact of a hard X-ray photon is followed by a series of electron cascading processes. Following theoretical indication, we show that this limitation can be circumvented and the cascading time can be significantly reduced if the X-ray photon energy is double the ionization energy [...] Restricted: PDF PDF (PDFA);