Short distance current correlators: Comparing lattice simulations to the instanton liquid

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Abstract
Point to point correlators of currents are computed in quenched QCD using a chiral lattice fermion action, the overlap action. Hadron correlators made of quark propagators restricted to low eigenvalue eigenmodes closely reproduce hadron correlators made of exact quark propagators at small quark mass in the pseudoscalar, scalar and difference of vector and axial vector channels. These results are in qualitative agreement (and in the difference of vector and axial vector channels, quantitative agreement) with the expectations of instanton liquid models. The scalar channel shows the effects of a quenched finite volume zero mode artifact, a negative correlator.

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