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An Estimate of the K0-K0bar Mixing Amplitude

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arxiv hep-lat/0012009 v2 pith:66RXD7EF submitted 2000-12-07 hep-lat hep-ph

classification hep-lathep-ph
keywords quenchedwilsonactionamplitudeapproximationcomputationcomputeddeviation
verification ladder T0 review T1 audit T2 compute T3 formal
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We computed the B_K parameter on the lattice by using a non-perturbatively improved Wilson action. From our quenched simulation, in the MSbar scheme and at mu=2 GeV, we obtain B_K=0.73(7)^{+0.05}_{-0.01}. To gain some insight in the systematic errors due to the use of the quenched approximation, we also made the unquenched computation with Wilson fermions. We do not observe any significant deviation with respect to the quenched result.

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