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题名: General formula for the four-quark condensate and vacuum factorization assumption
作者: Zong, Hong-Shi ;  He, Deng-Ke ;  Hou, Feng-Yao ;  Sun, Wei-Min
刊名: INTERNATIONAL JOURNAL OF MODERN PHYSICS A
出版日期: 2008
卷号: 23, 期号:10, 页码:1507-1520
关键词: QCD SUM-RULES ;  SUSCEPTIBILITY ;  PHYSICS ;  QUARK
学科分类: Physics
通讯作者: Zong, HS , Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
部门归属: [Zong, HS; He, DK; Hou, FY; Sun, WM] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China; [Zong, HS; Sun, WM] Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China; [Hou, FY] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000255555700003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5549
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Zong, Hong-Shi,He, Deng-Ke,Hou, Feng-Yao,et al. General formula for the four-quark condensate and vacuum factorization assumption[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2008,23(10):1507-1520.
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