New results on cut-off effects in spectroscopy with the fixed point action

Abstract

Our study on the cut-off effects in quenched light hadron spectroscopy and pion scattering length with the fixed point action is extended by results obtained at a lattice spacing a=0.102 fm in a box of size L=1.8 fm. The cut-off effects are small, but clearly seen as the resolution is increased from a=0.153 fm to a=0.102 fm. In the quark mass region where the errors are small and under control, our results on the APE plot lie close to the extrapolated numbers of the CP-PACS Collaboration.

arXiv comment15 pages, 11 figures, reference corrected

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• Hadron Scattering in an Asymmetric Box
• Simulating Full QCD with the Fixed Point Action
• Machine learning a fixed point action for SU(3) gauge theory with a gauge equivariant convolutional neural network
• Absence of evidence for pentaquarks on the lattice
• Optimised Dirac Operators on the Lattice: Construction, Properties and Applications
• A general study on the volume dependence of spectral weights in lattice field theory