Properties, ensembles and hadron spectra with Stabilised Wilson Fermions

TL;DR

This paper introduces the Stabilised Wilson Fermions framework within the OPEN LATtice initiative, demonstrating its potential for stable, precise lattice QCD simulations across various parameters and providing initial results on hadron spectra and continuum extrapolations.

Contribution

The paper presents the development and initial testing of Stabilised Wilson Fermions, including tuning strategies, scaling studies, and continuum extrapolations, advancing lattice QCD computational methods.

Findings

Successful tuning of the clover coefficient.

Extension of lattice spacings down to 0.12 fm.

Initial continuum extrapolation results for nucleon mass.

Abstract

In this joint contribution we announce the formation of the "OPEN LATtice initiative", https://openlat1.gitlab.io, to study Stabilised Wilson Fermions (SWF). They are a new avenue for QCD calculations with Wilson-type fermions and we report results on our continued study of this framework: Tuning the clover improvement coefficient, and extending the reach of lattice spacings to $a=0.12$ fm. We fix the flavor symmetric points $m_\pi=m_K=412$ MeV at $a=0.055,0.064, 0.077, 0.094, 0.12$ fm and define the trajectories to the physical point by fixing the trace of the quark mass matrix. Currently our pion mass range extends down to $m_\pi\sim200$ MeV. We outline our tuning goals and strategy as well as our future planned ensembles. First scaling studies are performed on $f_\pi$ and $m_\pi$. Additionally results of a preliminary continuum extrapolation of $m_N$ at the flavor symmetric point are presented. Going further a first determination of the light and strange hadron spectrum chiral dependence is shown, which serves to check the quality of the action for precision measurements. We also investigate other quantities such as flowed gauge observables to study how the continuum limit is approached. Taken together we observe the SWF enable us to perform stable lattice simulations across a large range of parameters in mass, volume and lattice spacing. Pooling resources our new initiative has made our reported progress possible and through it we will share generated gauge ensembles under an open science philosophy.