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Improving meson two-point functions in lattice QCD

2004; Elsevier BV; Volume: 159; Issue: 3 Linguagem: Inglês

10.1016/j.cpc.2004.02.006

1879-2944

Thomas DeGrand, Stefan Schaefer,

High-Energy Particle Collisions Research

We describe and test a method to compute Euclidean meson two-point functions in lattice QCD. The contribution from the low-lying eigenmodes of the Dirac operator is averaged over all positions of the quark sources. The contribution from the higher modes is estimated in the traditional way with one or a few source points per lattice. In some channels, we observe a significant improvement in the two-point functions for small quark masses.