Reports

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2018-10-19
09:17
OpenAccess [PUBDB-2018-03848] Book/Report/Dissertation / PhD Thesis
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Structure of complex fluids under shear flows
[DESY-THESIS-2018-028]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY THESIS 137 pp. () [10.3204/PUBDB-2018-03848] = Dissertation, Universit├Ąt Hamburg, 2018  GO
With the recent developments of modern synchrotron and X-ray Free Electron Laser (XFEL) light sources high speed and micrometer sized liquid jets have become one of the most important sample delivery systems. For that reason it is highly important to develop liquid jet devices compatible with micrometer X-ray beams, which are optimized for the investigation of nanostructures and the behavior of complex liquids behavior under flow.This thesis reports a detailed X-ray scattering study of a liquid jet produced by a gas dynamic virtual nozzle (GDVN) system. [...]
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2018-10-18
12:42
OpenAccess [PUBDB-2018-03832] Preprint/Report
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Longitudinal double-spin asymmetries in semi-inclusive deep-inelastic scattering of electrons and positrons by protons and deuterons
[DESY-18-181; arXiv:1810.07054]
 GO
A comprehensive collection of results on longitudinal double-spin asymmetries is presented for charged pions and kaons produced in semi-inclusive deep-inelastic scattering of electrons and positrons on the proton and deuteron, based on the full HERMES data set. The dependence of the asymmetries on hadron transverse momentum and azimuthal angle extends the sensitivity to the flavor structure of the nucleon beyond the distribution functions accessible in the collinear framework. [...]
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2018-10-10
14:13
OpenAccess [PUBDB-2018-03747] Report/Internal Report

Android Application for Calculation of One-Dimensional Pressure Profiles in Vacuum Pipes: eine Android App zum Berechnen von eindimensionalen Druckprofilen in Strahlrohren
[DESY-M-18-03]
10 pp. () [10.3204/PUBDB-2018-03747]  GO
The programs calcvac/vacline can calculate logitudinal one-dimensional pressure profiles in vacuum pipes. The pipes can consist of different sections of different shape and material. [...]
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2018-10-08
11:21
OpenAccess [PUBDB-2018-03722] Report/Journal Article
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Simulating twisted mass fermions at physical light, strange, and charm quark masses
[arXiv:1807.00495]
We present the QCD simulation of the first gauge ensemble of two degenerate light quarks, a strange and a charm quark with all quark masses tuned to their physical values within the twisted mass fermion formulation. Results for the pseudoscalar masses and decay constants confirm that the produced ensemble is indeed at the physical parameters of the theory. [...]
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ddc:530
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2018-10-08
10:30
arXiv [PUBDB-2018-03717] Report/Journal Article
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Detection of the blazar S4 0954+65 at very-high-energy with the MAGIC telescopes during an exceptionally high optical state
[arXiv:1801.04138]
ims.The very high energy (VHE&100GeV)╬│-ray MAGIC observations of the blazar S4 0954+65, were triggered by anexceptionally high flux state of emission in the optical. This blazar has a disputed redshift ofz= 0.368 orz>0.45 and an uncertainclassification among blazar subclasses. [...]
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ddc:520
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2018-10-08
10:06
arXiv [PUBDB-2018-03715] Report/Journal Article
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The starburst galaxy NGC 253 revisited by H.E.S.S. and Fermi-LAT
[arXiv:1806.03866]
Context. NGC 253 is one of only two starburst galaxies found to emit $\gamma$-rays from hundreds of MeV to multi-TeV energies. [...]
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2018-10-08
09:48
OpenAccess [PUBDB-2018-03714] Report/Journal Article
; ; ; et al
Light-Cone Parton Distribution Functions from Lattice QCD
[arXiv:1803.02685]
We extract parton distribution functions (PDFs) of the nucleon from lattice QCD using an ensemble of gauge field configurations simulated with light quark masses fixed to their physical values. Theoretical and algorithmic improvements that allow such a calculation include momentum smearing to reach large nucleon boosts with reduced statistical errors, nonperturbative renormalization, target mass corrections, and a novel modified matching of lattice QCD results to connect to what is extracted from experimental measurements. [...]
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ddc:530
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2018-10-02
10:46
arXiv [PUBDB-2018-03704] Preprint/Report
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On operator mixing in fermionic CFTs in non-integer dimensions
[arXiv:1809.00021; DESY-18-149]
We consider renormalization of four-fermion operators in the critical QED and $SU(N_c)$ version of Gross--Neveu--Yukawa model in non-integer dimensions. Since the number of mixing operators is infinite, the diagonalization of an anomalous dimension matrix becomes a nontrivial problem. [...]
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2018-10-01
12:19
OpenAccess [PUBDB-2018-03685] Preprint/Report
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Integrability in heavy quark effective theory record
[arXiv:1804.06289; DESY-18-056]
 GO
It was found that renormalization group equations in the heavy-quark effective theory (HQET) for the operators involving one effective heavy quark and light degrees of freedom are completely integrable in some cases and are related to spin chain models with the Hamiltonian commuting with the nondiagonal entry C(u) of the monodromy matrix. In this work we provide a more complete mathematical treatment of such spin chains in the QISM framework. [...]
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2018-10-01
10:53
arXiv [PUBDB-2018-03678] Preprint/Report
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Breakdown of NRQCD Factorization in Processes Involving Two Quarkonia and its Cure
[arXiv:1809.07993; DESY-18-168]
We study inclusive processes involving two heavy quarkonia in nonrelativisitic QCD (NRQCD) and demonstrate that, in the presence of two P-wave Fock states, NRQCD factorization breaks down, leaving uncanceled infrared singularities. As phenomenologically important examples, we consider the decay $\Upsilon \to \chi_{cJ}+X$ via $b\bar{b}({}^3P_{J_b}^{[8]})\to c\bar{c}({}^3P_J^{[1]})+gg$ and the production process $e^+e^-\to J/\psi+\chi_{cJ}+X$ via $e^{+}e^{-}\to c\bar{c}({}^3P_{J_1}^{[8]})+c\bar{c}({}^3P_J^{[1]})+g$. [...]
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