Vacuum fluctuations of qq and values of low-energy constants
Abstract
We discuss the influence of the vacuum fluctuations of qq pairs on low-energy constants and condensates. The analysis of the Goldstone boson masses and decay constants shows that the three-flavour condensate and some low-energy constants are very sensitive to the value of L6, which measures the Zweig-rule violation in the scalar channel. A chiral sum rule based on experimental data in this channel is used to constrain L6, confirming a significant decrease between the two- and the three-flavor condensates.
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