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- Forschungszentrum JülichDE23 papers
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13 papers · 1 filter
The hadronic vacuum polarization and automatic O(a) improvement for twisted mass fermions
Florian Burger, Grit Hotzel, Karl Jansen +1
The vacuum polarization tensor and the corresponding vacuum polarization function are the basis for calculations of numerous observables in lattice QCD. Examples are the hadronic c…
Short distance singularities and automatic O() improvement: the cases of the chiral condensate and the topological susceptibility
Krzysztof Cichy, Elena Garcia-Ramos, Karl Jansen
Short-distance singularities in lattice correlators can modify their Symanzik expansion by leading to additional O() lattice artifacts. At the example of the chiral condensate a…
Spectral density of the Dirac operator in two-flavour QCD
Georg P. Engel, Leonardo Giusti, Stefano Lottini +1
We compute the spectral density of the (Hermitean) Dirac operator in Quantum Chromodynamics with two light degenerate quarks near the origin. We use CLS/ALPHA lattices generated wi…
Simulation of QCD with N_f=2+1 flavors of non-perturbatively improved Wilson fermions
Mattia Bruno, Dalibor Djukanovic, Georg P. Engel +11
We describe a new set of gauge configurations generated within the CLS effort. These ensembles have N_f=2+1 flavors of non-perturbatively improved Wilson fermions in the sea with t…
On the effects of heavy sea quarks at low energies
Mattia Bruno, Jacob Finkenrath, Francesco Knechtli +2
We present a factorisation formula for the dependence of light hadron masses and low energy hadronic scales on the mass of a heavy quark: apart from an overall factor , rati…
The gradient flow running coupling with twisted boundary conditions
A. Ramos
We study the gradient flow for Yang-Mills theories with twisted boundary conditions. The perturbative behavior of the energy density is used to define a runni…