Modified approach for calculating axial vector vacuum susceptibility
Modified approach for calculating axial vector vacuum susceptibility
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DOI：
10.1103/physrevc.73.035206
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发表时间：
2006-03
影响因子：
3.1
通讯作者：
H. Zong;Yuan-mei Shi;Wei-Min Sun;J. Ping
中科院分区：
文献类型：
--
作者：
H. Zong;Yuan-mei Shi;Wei-Min Sun;J. Ping
我们概括了我们以前的工作[Phys.Rev.C72,035202(2005年)]为了使其适用于更广泛的一类问题，在恒定外场存在的情况下，修饰夸克传播子的线性响应理论适用于可变外场的情况。以轴向矢量真空极化率为例，应用这一一般形式，导出了量子色动力学(QCD)求和规则两点外场公式中轴向矢量真空极化率的新表达式。轴向矢量真空极化率的数值是在Dyson-Schwinger方法的彩虹阶梯近似框架内计算的。并与以往方法的结果进行了比较。
We generalize our previous work [Phys. Rev. C 72, 035202 (2005)] on the linear response theory of the dressed quark propagator in the presence of a constant external field to the case of a variable external field in order to make it applicable to a wider class of problems. Using the axial vector vacuum susceptibility as an illustration, we apply this general formalism to extract a new expression for the axial vector vacuum susceptibility in the quantum chromodynamical (QCD) sum rule two-point external field formula. The numerical values of the axial vector vacuum susceptibility are calculated within the framework of the rainbow-ladder approximation of the Dyson-Schwinger approach. A comparison with the results of the previous approaches is given.