Nambu-Jona-Lasinio model in a parallel electromagnetic field
Nambu-Jona-Lasinio model in a parallel electromagnetic field
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平行电磁场中的 Nambu-Jona-Lasinio 模型
DOI：
10.1016/j.physletb.2018.03.018
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发表时间：
2018
影响因子：
4.4
通讯作者：
Zhuang Pengfei
中科院分区：
文献类型：
--
作者：
Wang Lingxiao;Cao Gaoqing;Huang Xu Guang;Zhuang Pengfei
我们探讨了在平行电磁场存在下，没有Kobayashi-Maskawa - 't Hooft行列式项的Nambu-Jona-Lasinio模型的U A(1)特征和手性对称性破缺。我们证明了电磁手性异常可以诱导有限中性介子凝聚和同位旋单重态伪标量η凝聚，从而改变了手性对称性破缺模式。为了表征ua(1)对称性破缺的强度，我们评估了与ua(1)电荷相关的磁化率。结果表明，手性异常引起的磁化率与相应η凝聚物的行为一致。本文还对介子激发谱进行了研究。
We explore the features of the U A (1) and chiral symmetry breaking of the Nambu–Jona-Lasinio model without the Kobayashi–Maskawa–'t Hooft determinant term in the presence of a parallel electromagnetic field. We show that the electromagnetic chiral anomaly can induce both finite neutral pion condensate and isospin-singlet pseudo-scalar η condensate and thus modifies the chiral symmetry breaking pattern. In order to characterize the strength of the U A (1) symmetry breaking, we evaluate the susceptibility associated with the U A (1) charge. The result shows that the susceptibility contributed from the chiral anomaly is consistent with the behavior of the corresponding η condensate. The spectra of the mesonic excitations are also studied.