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Vacuum fluctuations of \(\bar q\)q and values of low-energy constants. (English) Zbl 1050.81712
Summary: We discuss the influence of the vacuum fluctuations of \(\bar q\)q pairs on low-energy constants and condensates. The analysis of the Goldstone boson masses and decay constants shows that the three-flavor condensate and some low-energy constants are very sensitive to the value of L\(_6\), 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 L\(_6\), confirming a significant decrease between the two- and the three-flavor condensates.

81V05 Strong interaction, including quantum chromodynamics
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