Abstract
We present an exploratory calculation of the standard model ΔS = 2 matrix element relevant for indirect CP violation in K → ππ decays. The computation is performed with overlap fermions in the quenched approximation at β = 6.0 on a 16 3x32 lattice. We make use of left-handed currents to eliminate spurious zero-mode contributions. The resulting bare matrix element is renormalized non-perturbatively. Our preliminary result is B K NDR(2GeV)=0.61(7) , where the error does not yet include an estimate of systematic uncertainties.
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