Preprints

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2017-01-16
12:46
OpenAccess [FZJ-2017-00451] Preprint
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Renormalization of the three-boson system with short-range interactions revisited
We consider renormalization of the three-body scattering problem in low-energy effective field theory of self-interacting scalar particles by applying time-ordered perturbation theory to the manifestly Lorentz-invariant formulation. The obtained leading-order equation is perturbatively renormalizable and non-perturbatively finite and does not require a three-body counter term in contrast to its non-relativistic approximation..
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2016-11-29
12:56
OpenAccess [FZJ-2016-06938] Preprint
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Temperature evolution of magnetic structure of HoFeO$_3$ by single crystal neutron diffraction
We have investigated the temperature evolution of the magnetic structures of HoFeO$_3$ by single crystal neutron diffraction. The three different magnetic structures found as a function of temperature for \hfo\ are described by the magnetic groups Pb$2_1$, Pbn$2_1$ and Pbn$2_1$ and are stable in the temperature ranges $\approx$ 600-55~K, 55-37~K and 35$>T>2$~K respectively. [...]
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2016-11-23
09:29
OpenAccess [FZJ-2016-06591] Preprint
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Double-polarization observable G in neutral-pion photoproduction off the proton
This paper reports on a measurement of the double-polarization observable G in $\pi^0$ photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly-polarized photons with longitudinally-polarized protons. [...]
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2016-11-23
09:28
OpenAccess [FZJ-2016-06590] Preprint
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Photon asymmetry measurements of $\overrightarrow{\gamma} \mathrm{p} \rightarrow \pi^{0} \mathrm{p}$ for E$_{\gamma}$=320$-$650 MeV
High statistics measurements of the photon asymmetry $\mathrm{\Sigma}$ for the $\overrightarrow{\gamma}$p$\rightarrow\pi^{0}$p reaction have been made in the center of mass energy range W=1214-1450 MeV. The data were measured with the MAMI A2 real photon beam and Crystal Ball/TAPS detector systems in Mainz, Germany. [...]
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2016-11-23
09:27
OpenAccess [FZJ-2016-06589] Preprint
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Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI
The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0.13_tot) GeV^{-2}, is in good agreement with previous measurements of the eta -> e^+e^-g and eta -> mu^+mu^-g decays. [...]
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2016-10-20
07:52
[FZJ-2016-05483] Preprint/Report

Assessment of the acceptance of energy systems transformation
[STE Preprint 20/2016]

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2016-10-18
18:09
[FZJ-2016-05452] Preprint
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High-Performance Computing in Neuroscience for Data-Driven Discovery, Integration, and Dissemination.

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2016-01-22
14:24
OpenAccess [FZJ-2016-00929] Preprint/Report
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Massive photons: an infrared regularization scheme for lattice QCD+QED
[MIT-CTP/4691, JLAB-THY-15-2112, NT@WM-15-12]
The commonly adopted approach for including electromagnetic interactions in lattice QCD simulations relies on using finite volume as the infrared regularization for QED. The long-range nature of the electromagnetic interaction, however, implies that physical quantities are susceptible to power-law finite volume corrections, which must be removed by performing costly simulations at multiple lattice volumes, followed by an extrapolation to the infinite volume limit. [...]
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2016-01-22
12:06
OpenAccess [FZJ-2016-00916] Preprint
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Quantum Monte Carlo Calculations for Carbon Nanotubes
We show how lattice Quantum Monte Carlo can be applied to the electronic properties of carbon nanotubes in the presence of strong electron-electron correlations. We employ the path-integral formalism and use methods developed within the lattice QCD community for our numerical work. [...]
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2016-01-22
12:04
OpenAccess [FZJ-2016-00915] Preprint
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Applying Twisted Boundary Conditions for Few-body Nuclear Systems
We describe and implement twisted boundary conditions for the deuteron and triton systems within finite-volumes using the nuclear lattice EFT formalism. We investigate the finite-volume dependence of these systems with different twists angles. [...]
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