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题名: General formula for the four-quark condensate and vacuum factorization assumption
作者: Zong, Hong-Shi1, 2; He, Deng-Ke1; Hou, Feng-Yao1, 3; Sun, Wei-Min1, 2
刊名: INTERNATIONAL JOURNAL OF MODERN PHYSICS A
出版日期: 2008-04-20
卷号: 23, 期号:10, 页码:1507-1520
关键词: QCD vacuum ; four-quark condensates ; vacuum saturation assumption
文章类型: Article
英文摘要: By differentiating the dressed quark propagator with respect to a variable background field, the linear response of the dressed quark propagator in the presence of the background field can be obtained. From this general method, using the vector background field as an illustration, we derive a general formula for the four-quark condensate <(0) over tilde vertical bar : (q) over bar (0)gamma mu q(0)(q) over bar (0)gamma mu q(0) : vertical bar(0) over tilde >. This formula contains the corresponding fully dressed vector vertex and it is shown that factorization for <(0) over tilde vertical bar : (q) over bar (0)gamma mu q(0)(q) over bar (0)gamma mu q(0) : vertical bar(0) over tilde > holds only when the dressed vertex is taken to be the bare one. This property also holds for all other types of four-quark condensate. By comparing this formula with the general expression for the corresponding vacuum susceptibility, it is found that there exists some intrinsic relation between these two quantities, which are usually treated as independent phenomenological inputs in the QCD sum rule external field approach. The above results are also generalized to the case of finite chemical potential and the factorization problem of the four-quark condensate at finite chemical potential is discussed.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Physics, Nuclear ; Physics, Particles & Fields
研究领域[WOS]: Physics
关键词[WOS]: QCD SUM-RULES ; SUSCEPTIBILITY ; PHYSICS ; QUARK
收录类别: SCI
语种: 英语
WOS记录号: WOS:000255555700003
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15893
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
2.Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
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