Simulation of QCD with N_f=2+1 flavors of non-perturbatively improved Wilson fermions

TL;DR

This paper presents new gauge configurations for lattice QCD simulations with 2+1 flavors of improved Wilson fermions, addressing topological freezing and providing detailed parameters and measurements.

Contribution

Introduction of a new set of gauge configurations with specific improvements and techniques for stable lattice QCD simulations.

Findings

Ensembles include N_f=2+1 flavors with improved Wilson fermions.

Use of open boundary conditions and twisted-mass reweighting enhances stability.

Measured pion, kaon masses, and scale parameter t_0.

Abstract

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 the Luescher-Weisz action used for the gluons. Open boundary conditions in time are used to address the problem of topological freezing at small lattice spacings and twisted-mass reweighting for improved stability of the simulations. We give the bare parameters at which the ensembles have been generated and how these parameters have been chosen. Details of the algorithmic setup and its performance are presented as well as measurements of the pion and kaon masses alongside the scale parameter t_0.