Vacuum Saturation Hypothesis and QCD Sum Rules

Abstract

The accuracy of the vacuum saturation hypothesis is discussed using the examples of vacuum expectation values of four-quark operators and the parameter $B$, which determines the short-distance contribution to the $K^0-{\bar{K}}^0$ mixing. Note added: The approach based on sum rules in position (x-)space as elaborated in the paper is relevant and useful tool for the current phenomenology. In particular, it provides the unique possibility of direct non-perturbative estimation of the VEV's of four-quark operators renormalized in any scheme, including the MSbar one.

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References in corpus (1)

• Calculation of the K^0-\bar{K}^0 mixing parameter via the QCD sum rules at finite energies

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