真空赝标磁化率
Vacuum pseudoscalar susceptibility
摘要：
我们通过等矢量-赝标真空极化导出了QCD中π介子磁化率的一个新的模型无关结果。在手征极限附近，π介子磁化率可以表示为两个独立项之和。第一个表示π-极贡献。第二个是相同的真空手征磁化率，它描述了QCD的基态的响应，在当前夸克质量的波动。在这个结果中，我们可以找到一个简单的解释，说明π介子磁化率的现存估计值之间的不匹配。
英文摘要：
We derive a novel model-independent result for the pion susceptibility in QCD via the isovector-pseudoscalar vacuum polarisation. In the neighbourhood of the chiral-limit, the pion susceptibility can be expressed as a sum of two independent terms. The first expresses the pion-pole contribution. The second is identical to the vacuum chiral susceptibility, which describes the response of QCD's ground-state to a fluctuation in the current-quark mass. In this result one finds a straightforward explanation of a mismatch between extant estimates of the pion susceptibility.
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