Vacuum pseudoscalar susceptibility
Vacuum pseudoscalar susceptibility
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DOI：
10.1103/physrevc.81.032201
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发表时间：
2009-12
影响因子：
3.1
通讯作者：
Lei Chang;Yu-xin Liu;C. Roberts;Yuan-mei Shi;Wei-Min Sun;H. Zong
中科院分区：
文献类型：
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作者：
Lei Chang;Yu-xin Liu;C. Roberts;Yuan-mei Shi;Wei-Min Sun;H. Zong
我们通过等矢量赝标量真空极化导出了 QCD 中 π 介子磁化率的新颖的独立于模型的结果。在手性极限附近，π介子磁化率可以表示为两个独立项的和。第一个表示π介子极的贡献。第二个与真空手性磁化率相同，它描述了 QCD 基态对当前夸克质量波动的响应。在这一结果中，人们找到了对现有π介子敏感性估计值之间不匹配的直接解释。
We derive a novel model-independent result for the pion susceptibility in QCD via the isovector-pseudoscalar vacuum polarization. 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.