QCD Simulations with Stabilised Wilson Fermions, Towards the Physical Pion Mass at a Fine Lattice Spacing

Rocco Francesco Basta (), Francesca Cuteri (), Anthony Francis (), Patrick Fritzsch (), Giovanni Pederiva (), Antonio Rago (), Andrea Shindler (), Andre Walker-Loud () and Savvas Zafeiropoulos ()
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Rocco Francesco Basta: Goethe Universität Frankfurt am Main
Francesca Cuteri: Goethe Universität Frankfurt am Main
Anthony Francis: National Yang Ming Chiao Tung University, Institute of Physics
Patrick Fritzsch: Trinity College Dublin, School of Mathematics
Giovanni Pederiva: Forschungszentrum Jülich GmbH, Jülich Supercomputing Centre
Antonio Rago: University of Southern Denmark, Quantum Theory Center and IMADA
Andrea Shindler: RWTH Aachen University, Institute for Theoretical Particle Physics and Cosmology
Andre Walker-Loud: Lawrence Berkeley National Laboratory, Nuclear Science Division
Savvas Zafeiropoulos: Aix Marseille University, Université de Toulon, CNRS, CPT

A chapter in High Performance Computing in Science and Engineering '23, 2026, pp 75-90 from Springer

Abstract: Abstract Stabilised Wilson Fermions (SWF) are a new avenue for QCD calculations with Wilson-type fermions. The OpenLat initiative is currently the only collaboration following this new line of research. With resources in the US, Germany, France and Finland OpenLat has been able to produce gauge field ensembles of 2+1 flavours of SWF across a wide range of lattice spacings $$a=0.055, 0.064, 0.077, 0.094, 0.12$$ a = 0.055 , 0.064 , 0.077 , 0.094 , 0.12 fm, with HLRS providing the most important contribution at the finest resolution of $$a=0.055$$ a = 0.055 fm so far. Matching the physical parameters as well as algorithmic tuning is increasingly challenging with decreasing lattice spacing as one has to switch to open boundary conditions to overcome the well-known topological freezing problem. We report on progress in simulating QCD at $$a=0.055$$ a = 0.055 fm and decreasing physical pion masses, as well on first observable measurements on such lattices.

Date: 2026
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DOI: 10.1007/978-3-031-91312-9_6

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