329 citations · 3.6k across the 77 of their papers we have counts for
77 papers · 1 filter
The influence of gauge field smearing on discretisation effects
Andreas Risch, Stefan Schaefer, Rainer Sommer
When designing lattice actions, gauge field smearing is frequently used to define the lattice Dirac operator. Since the smearing procedure removes effects of ultraviolet fluctuatio…
Learning Trivializing Gradient Flows for Lattice Gauge Theories
Simone Bacchio, Pan Kessel, Stefan Schaefer +1
We propose a unifying approach that starts from the perturbative construction of trivializing maps by Lüscher and then improves on it by learning. The resulting continuous normaliz…
Scale Setting for CLS 2+1 Simulations
Ben Straßberger, Marco Cè, Sara Collins +9
We present an update of the scale setting for flavor QCD using gradient flow scales and pseudo-scalar decay constants. We analyze the latest ensembles with flavors…
Remarks on strange-quark simulations with Wilson fermions
Daniel Mohler, Stefan Schaefer
In the simulation of QCD with 2+1 flavors of Wilson fermions, the positivity of the fermion determinant is generally assumed. We present evidence that this assumption is in general…
Frequency-splitting estimators for single-propagator traces
Leonardo Giusti, Tim Harris, Alessandro Nada +1
In these proceedings we address the computation of quark-line disconnected diagrams in lattice QCD. The evaluation of these diagrams is required for many phenomenologically interes…
Frequency-splitting estimators of single-propagator traces
Leonardo Giusti, Tim Harris, Alessandro Nada +1
Single-propagator traces are the most elementary fermion Wick contractions which occur in numerical lattice QCD, and are usually computed by introducing random-noise estimators to…
Multi-level integration for meson propagators
Leonardo Giusti, Tim Harris, Alessandro Nada +1
The computation of many correlation functions in lattice QCD is severely hindered by a signal-to-noise problem. Recent developments in the factorization of both the fermion propaga…
New extended interpolating fields built from three-dimensional fermions
Mauro Papinutto, Francesco Scardino, Stefan Schaefer
New extended interpolating operators made of quenched three dimensional fermions are introduced in the context of lattice QCD. The mass of the 3D fermions can be tuned in a control…
Testing the event-chain algorithm in asymptotically free models
Martin Hasenbusch, Stefan Schaefer
We apply the event-chain algorithm proposed by Bernard, Krauth and Wilson in 2009 to toy models of lattice QCD. We give a formal prove of stability of the algorithm. We study its p…
CLS 2+1 flavor simulations at physical light- and strange-quark masses
Daniel Mohler, Stefan Schaefer, Jakob Simeth
We report recent efforts by CLS to generate an ensemble with physical light- and strange-quark masses in a lattice volume of 192x96^3 at corresponding to a lattice spacing…
Local multiboson factorization of the quark determinant
Marco Cè, Leonardo Giusti, Stefan Schaefer
We discuss the recently proposed multiboson domain-decomposed factorization of the gauge-field dependence of the fermion determinant in lattice QCD. In particular, we focus on the…
Multi-boson block factorization of fermions
Leonardo Giusti, Marco Cè, Stefan Schaefer
The numerical computations of many quantities of theoretical and phenomenological interest are plagued by statistical errors which increase exponentially with the distance of the s…
The strong coupling from a nonperturbative determination of the parameter in three-flavor QCD
M. Bruno, M. Dalla Brida, P. Fritzsch +6
We present a lattice determination of the parameter in three-flavor QCD and the strong coupling at the Z pole mass. Computing the nonperturbative running of the coupling in the…
The -parameter in 3-flavour QCD and by the ALPHA collaboration
M. Bruno, M. Dalla Brida, P. Fritzsch +6
We present results by the ALPHA collaboration for the -parameter in 3-flavour QCD and the strong coupling constant at the electroweak scale, , in terms of hadronic qua…
New extended interpolating operators for hadron correlation functions
Francesco Scardino, Mauro Papinutto, Stefan Schaefer
New extended interpolating operators made of quenched three dimensional fermions are introduced in the context of lattice QCD. The mass of the 3D fermions can be tuned in a control…
Domain decomposition and multilevel integration for fermions
Marco Cè, Leonardo Giusti, Stefan Schaefer
The numerical computation of many hadronic correlation functions is exceedingly difficult due to the exponentially decreasing signal-to-noise ratio with the distance between source…
The determination of by the ALPHA collaboration
Mattia Bruno, Mattia Dalla Brida, Patrick Fritzsch +6
We review the ALPHA collaboration strategy for obtaining the QCD coupling at high scale. In the three-flavor effective theory it avoids the use of perturbation theory at a…
The large limit of the topological susceptibility of Yang-Mills gauge theory
Marco Cè, Miguel García Vera, Leonardo Giusti +1
We present a precise computation of the topological susceptibility of SU Yang-Mills theory in the large limit. The computation is done on the lattice, u…
A local factorization of the fermion determinant in lattice QCD
Marco Cè, Leonardo Giusti, Stefan Schaefer
We introduce a factorization of the fermion determinant in lattice QCD with Wilson-type fermions that leads to a bosonic action which is local in the block fields. The interaction…
Setting the scale for the CLS flavor ensembles
Mattia Bruno, Tomasz Korzec, Stefan Schaefer
We present measurements of a combination of the decay constants of the light pseudoscalar mesons and the gradient flow scale , which allow to set the scale of the lattices gen…
The topological susceptibility in the large-N limit of SU(N) Yang-Mills theory
Marco Cè, Miguel García Vera, Leonardo Giusti +1
We compute the topological susceptibility of the SU(N) Yang-Mills theory in the large-N limit with a percent level accuracy. This is achieved by measuring the gradient-flow definit…
Domain decomposition, multi-level integration and exponential noise reduction in lattice QCD
Marco Cè, Leonardo Giusti, Stefan Schaefer
We explore the possibility of computing fermionic correlators on the lattice by combining a domain decomposition with a multi-level integration scheme. The quark propagator is expa…
A multilevel algorithm for flow observables in gauge theories
Miguel García Vera, Stefan Schaefer
We study the possibility of using multilevel algorithms for the computation of correlation functions of gradient flow observables. For each point in the correlation function an app…
On the extraction of spectral quantities with open boundary conditions
Mattia Bruno, Piotr Korcyl, Tomasz Korzec +2
We discuss methods to extract decay constants, meson masses and gluonic observables in the presence of open boundary conditions. The ensembles have been generated by the CLS effort…