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Nonlocal Four-Quark Condensate and Vacuum Susceptibilities |
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| Authors: | ZONG HongShi L&# XiaoFu ZHAO EnGuang WANG Fan |
| Affiliation: | 1. Department of Physics, Nanjing University, Nanjing 210093, China;2. Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, Beijing 100080, China;3. Department of Physics, Sichuan University, Chengdu 610064, China |
| Abstract: | Based on the quark propagator in the instanton dilute liquid approximation, we have determined the nonlocal four-quark condensate at the mean-field level in the framework of global color symmetry model. By making use of this formula, the vacuum susceptibility (pionsusceptibility) was calculated in this paper. The theoretical analysis and numerical calculation show that even at the mean-field level the naive vacuum saturation approximation is not a good approximation when we consider nonlocal four-quark condensate. |
| Keywords: | instanton dilute liquid approximation global colour symmetry model vacuum saturation approximation vacuum susceptibilities |
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