Journal Article

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2020-06-02
10:31
DBCoverage [PUBDB-2020-02247] Journal Article
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Fourth post-Newtonian Hamiltonian dynamics of two-body systems from an effective field theory approach
[ 2003.01692 [gr-qc]; DESY 20--025; DO--TH 20/01; SAGEX-20--03]
We calculate the motion of binary mass systems in gravity up to the fourth post--Newtonian order. We use momentum expansions within an effective field theory approach based on Feynman amplitudes in harmonic coordinates by applying dimensional regularization. [...]
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2020-06-02
10:14
DBCoverage [PUBDB-2020-02245] Journal Article
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The Two-mass Contribution to the Three-Loop Polarized Operator Matrix Element $A_{gg,Q}^{(3)}$
[ 2004.08916 [hep-ph]; DESY-20-051; DO--TH 20/03; SAGEX--20--07--E; TTP 20--013]
We compute the two-mass contributions to the polarized massive operator matrix element $A_{gg,Q}^{(3)}$ at third order in the strong coupling constant $\alpha_s$ in Quantum Chromodynamics analytically. These corrections are important ingredients for the matching relations in the variable flavor number scheme and for the calculation of Wilson coefficients in deep--inelastic scattering in the asymptotic regime $Q^2 \gg m_c^2, m_b^2$. [...]
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2020-06-02
09:58
DBCoverage [PUBDB-2020-02240] Journal Article
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Subleading logarithmic QED initial state corrections to e + e − → γ ⁎ / Z 0 ⁎ to O(α6L5)
Using the method of massive operator matrix elements, we calculate the subleading QED initial state radiative corrections to the process $e^+e^- \rightarrow \gamma^*/Z^*$ for the first three logarithmic contributions from $O(\alpha^3 L^3), O(\alpha^3 L^2), O(\alpha^3 L)$ to $O(\alpha^5 L^5), O(\alpha^5 L^4), O(\alpha^5 L^3)$ and compare their effects to the leading contribution $O(\alpha^6 L^6)$ and one more subleading term $O(\alpha^6 L^5)$. The calculation is performed in the limit of large center of mass energies squared $s \gg m_e^2$. [...]
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2020-05-27
14:06

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2020-05-27
09:31
OpenAccess [PUBDB-2020-02214] Journal Article
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Depth-resolved core level spectroscopy of noncentrosymmetric solid BiPd
Understanding exotic solids is a difficult task as interactions are often hidden by the symmetry of the system. Here, we study the electronic properties of a noncentrosymmetric solid, BiPd, which is a rare material exhibiting both superconductivity and the topological phase of matter. [...]
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2020-05-27
09:18
[PUBDB-2020-02213] Journal Article
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Complex hybridization physics in $CaFe_{2}As_{2}$ - a high resolution hard x-ray photoemission study
Employing high resolution hard x-ray photoemission spectroscopy, we investigate the electronic structure of an exotic Fe-based superconductor, CaFe$_2$As$_2$, which exhibits rich temperature pressure phase diagram and dichotomy on achieving superconductivity on application of pressure. The experimental valence band spectra exhibit significant differences for experiments at different surface sensitivities. [...]
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2020-05-25
11:34
Embargoed OpenAccess [PUBDB-2020-02188] Journal Article

Nuclear quantum effects in state-selective scattering from ring polymer molecular dynamics
We present an efficient method to obtain initial state-selective cross sections for bimolecular reactions that can account for certain nuclear quantum effects by employing the ring polymer molecular dynamics approach. The method combines the well known quasiclassical trajectory (QCT) approach with the description of the system in an extended ring polymer phase space. [...]
Published on 2020-05-21. Available in OpenAccess from 2021-05-21.: Download fulltextPDF Download fulltextPDF (PDFA);
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2020-05-25
11:23
OpenAccess [PUBDB-2020-02187] Journal Article
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Setting the photoelectron clock through molecular alignment
The interaction of strong laser fields with matter intrinsically provides a powerful tool for imaging transient dynamics with an extremely high spatiotemporal resolution. Here, we study strong-field ionisation of laser-aligned molecules, and show a full real-time picture of the photoelectron dynamics in the combined action of the laser field and the molecular interaction. [...]
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2020-05-25
09:25
OpenAccess [PUBDB-2020-02186] Report/Journal Article
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Comparison of topological charge definitions in Lattice QCD
[DESY-17-115; arXiv:1708.00696]
In this paper, we show a comparison of different definitions of the topological charge on the lattice. We concentrate on one small-volume ensemble with 2 flavours of dynamical, maximally twisted mass fermions and use three more ensembles to analyze the approach to the continuum limit. [...]
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2020-05-22
14:11
OpenAccess [PUBDB-2020-02178] Journal Article
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Probing the chemistry of CdS paints in The Scream by in situ noninvasive spectroscopies and synchrotron radiation x-ray techniques
Science advances 6(20), eaay3514 - () [10.1126/sciadv.aay3514]  GO
The degradation of cadmium sulfide (CdS)–based oil paints is a phenomenon potentially threatening the iconic paint-ing The Scream (ca. 1910) by Edvard Munch (Munch Museum, Oslo) that is still poorly understood. [...]
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