Abstract
The QCD finite energy sum rule methods is used to show that the parameter of the K 0− K 0 mixing B ̂ is mainly determined by the value of gm s〈 dG μνσ μνd〉 and the vacuum expectation values of four-quark operators. Assuming the hypothesis of vacuum dominance and/or unitary symmetry to estimate the latter, it is found that B ̂ = 1.2 ± 0.1 .
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