A5049615520- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Nuclear physics research studies
- Advanced NMR Techniques and Applications
- Spectral Theory in Mathematical Physics
- Prosthetics and Rehabilitation Robotics
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Stroke Rehabilitation and Recovery
- Quantum chaos and dynamical systems
- Muscle activation and electromyography studies
- Theoretical and Computational Physics
- Algebraic and Geometric Analysis
- Geophysics and Gravity Measurements
- Stochastic processes and statistical mechanics
- Stochastic processes and financial applications
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Ergonomics and Human Factors
Forschungszentrum Jülich
2025
University of Wuppertal
2025
Scuola Superiore Sant'Anna
2022-2024
University of Florence
2020
Johannes Gutenberg University Mainz
2008-2019
Helmholtz Institute Mainz
2012-2019
Goethe University Frankfurt
2016-2019
Instituto de Física Corpuscular
2014
University of Tsukuba
2011-2014
Brookhaven National Laboratory
2011
We report on our calculation of the nucleon axial charge gA in QCD with two flavours dynamical quarks. A detailed investigation systematic errors is performed, a particular focus contributions from excited states to three-point correlation functions. The use summed operator insertions allows for much better control over such contamination. After performing chiral extrapolation physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), good agreement experimental value.
Moments of the quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD. Calculations proton matrix elements operators corresponding to these moments through operator product expansion have been performed on ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ lattices for Wilson fermions at $\ensuremath{\beta}=5.6$ using configurations from SESAM Collaboration $\ensuremath{\beta}=5.5$ SCRI. One-loop perturbative renormalization corrections included. At...
We present results for the nucleon electromagnetic form factors, including momentum transfer dependence and derived quantities (charge radii magnetic moment). The analysis is performed using O(a) improved Wilson fermions in Nf=2 QCD measured on CLS ensembles. Particular focus placed a systematic evaluation of influence excited states three-point correlation functions, which lead to biased evaluation, if not accounted correctly. argue that use summed operator insertions fit ans\"atze allow us...
We perform a precision computation of hybrid static potentials with quantum numbers ${\mathrm{\ensuremath{\Lambda}}}_{\ensuremath{\eta}}^{\ensuremath{\epsilon}}={\mathrm{\ensuremath{\Sigma}}}_{g}^{\ensuremath{-}},{\mathrm{\ensuremath{\Sigma}}}_{u}^{+},\phantom{\rule{0ex}{0ex}}{\mathrm{\ensuremath{\Sigma}}}_{u}^{\ensuremath{-}},{\mathrm{\ensuremath{\Pi}}}_{g},{\mathrm{\ensuremath{\Pi}}}_{u},{\mathrm{\ensuremath{\Delta}}}_{g},{\mathrm{\ensuremath{\Delta}}}_{u}$ using SU(3) lattice gauge...
We present a lattice calculation of the nucleon isovector axial and induced pseudoscalar form factors on CLS ensembles using [Formula: see text] dynamical flavors nonperturbatively text]-improved Wilson fermions an current together with density. Excited-state effects in extraction are treated variety methods, detailed discussion their respective merits. The chiral continuum extrapolation results is performed both formulae inspired by Heavy Baryon Chiral Perturbation Theory (HBChPT) global...
Karsten-Wilczek and Borici-Creutz fermions show a near-degeneracy of the $2$ species involved, similar to $2^{d/2}$ staggered fermions. Hence in $d=2$ dimensions all three formulations happen be minimally doubled (two species). This shows up both eigenvalue spectrum respective Dirac operator spectroscopic quantities (e.g. pion mass), but former case it is easier quantify. We use quenched Schwinger model determine low-lying eigenvalues these fermion operators at fixed gradient flow time...
Minimally doubled fermion actions offer a discretization for two-flavor Quantum Chromodynamics without rooting, but retaining U(1) chiral symmetry at the same time. The price to pay is breaking of hypercubic symmetry, which requires inclusion and tuning new counterterms. Similar staggered quarks, these suffer from taste breaking. We perform mixed action numerical study with Karsten-Wilczek formulation minimally fermions on 4stout configurations, generated physical quark masses, covering...
In the context of hand and finger rehabilitation, kinematic compatibility is key for acceptability clinical exploitation robotic devices. Different chain solutions have been proposed in state art, with different trade-offs between characteristics compatibility, adaptability to anthropometries, ability compute relevant information. This study presents design a novel mobilization metacarpophalangeal (MCP) joint long fingers mathematical model real-time computation angle transferred torque. The...
Minimally doubled fermions have been proposed as a cost-effective realization of chiral symmetry at non-zero lattice spacing. Using perturbation theory one loop, we study their renormalization properties. Specifically, investigate the consequences breaking hyper-cubic symmetry, which is typical feature this class fermionic discretizations. Our results for quark self-energy indicate that four-momentum undergoes linearly divergent. We also compute factors bilinears, construct conserved vector...
The renormalization of the most general dimension-six four-fermion operators without power subtractions is studied at one loop in lattice perturbation theory using overlap fermions. As expected, with different chirality do not mix among themselves and parity-conserving parity-violating multiplets renormalize same way. constants unimproved improved are also same. These mixing factors necessary to determine physical matrix elements relevant many phenomenological applications weak interactions....
Abstract Despite the current industrial trend towards automation, many workers are still daily exposed to heavy loads during their duties. Regarding construction industry, shotcrete projection results in a particularly arduous whole-body effort for so-called “concrete reinforcement workers”. In this paper, design of passive robotic human assistance tool assist dealing with specific task will be described. If an effective aid plays crucial role improving job’s quality, following guidelines...
We compute hybrid static potentials in SU(3) lattice gauge theory. present a method to generate large set of suitable creation operators with defined quantum numbers from elementary building blocks. show preliminary results for several channels and discuss, which structures the gluonic flux tube seem be realized by ground states these channels.