Statistical errors of sea-quark isospin-breaking diagrams scale as sqrt(volume) as predicted, but show no leading 1/a or 1/a^2 divergence at lattice spacings 0.05-0.1 fm.
Hill et al., Bringing near-physical QCD+QED calculations beyond the electro-quenched approximation , PoS LATTICE2024 (2025) 252
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Error Scaling of Sea Quark Isospin-Breaking Effects
Statistical errors of sea-quark isospin-breaking diagrams scale as sqrt(volume) as predicted, but show no leading 1/a or 1/a^2 divergence at lattice spacings 0.05-0.1 fm.