Modified approach for calculating four-quark condensates

作者：Zong Hong-Shi^*; Sun Wei-Min

来源：Communications in Theoretical Physics, 2007, 47(2): 293-298.

• QCD vacuum
• four-quark condensates
• Dyson-Schwinger approach

By differentiating the dressed quark propagator with respect to a variable background held, 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 extract a general formula for the four-quark condensate ((0) over tilde vertical bar : (q) over tilde (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. We use this formula to analyze the factorization problem of the four-quark condensate and show that in the bare vertex approximation factorization holds exactly.

• 出版日期2007-2-15
• 单位南京大学