Operator product expansion and quark condensate from Lattice QCD in coordinate space

Details Operator product expansion and quark condensate from Lattice QCD in coordinate space Operator product expansion and quark condensate from Lattice QCD in coordinate space

2005-03-02

arxiv.org/abs/hep-lat/0503001v1

Eur.Phys.J.C41:535-544,2005

Physics

High Energy Physics

High Energy Physics - Lattice

Scientific paper

10.1140/epjc/s2005-02250-9

We present a Lattice QCD determination of the chiral quark condensate based on a new method. We extract the quark condensate from the operator product expansion of the quark propagator at short euclidean distances, where it represents the leading contribution in the chiral limit. From this study we obtain <\bar q q>^ms(2 GeV)=-(265+-5+-22 MeV)^3$, in good agreement with determinations of this quantity based on different approaches. The simulation is performed by using the O(a)-improved Wilson action at beta=6.45 on a volume 32^3\times70 in the quenched approximation.

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