Abstract
We review the evaluation of some weak kaonic matrix elements in the framework of QCD sum rules for three-point functions. The main subject is the calculation of the B parameter. We compare critically the different published results. Out conclusion is that B=0. 55±0.25 should be accepted as the result from three-point function sum rules. The quoted error is a personal guess and could be invalidated by higher-order corrections. This result confirms that the vaccum insertion method overestimates the B parameter. The use of the QCD sum rules in the evaluation of other weak matrix elements is discussed.
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