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arXiv 1602.01476hep-phhep-lat
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赝标磁化率和夸克凝聚:手征恢复和晶格屏蔽质量

Pseudoscalar susceptibilities and quark condensates: chiral restoration and lattice screening masses

A. Gomez Nicola, J. Ruiz de Elvira

摘要:

我们导出了三味QCD中与赝标伸缩性和夸克凝聚有关的形式沃德恒等式,包括一致的$η$扇区和$U_A(1)$反常。这些恒等式在ChPT提供的低能量实现中得到验证,既在八重态情况下的标准$SU(3)$框架中,又结合使用$U(3)$框架和QCD的大- $N_c$扩展来适当地解释九重扇区和异常贡献。所作的分析包括有限温度修正以及$U(3)$夸克凝聚和所有赝标磁化率的计算,连同全套沃德恒等式,都是这项工作的新结果。最后,利用沃德恒等式导出了赝标质量的标度关系,解释了在手征对称性恢复附近晶格屏蔽质量随温度的变化.

英文摘要:

We derive the formal Ward identities relating pseudoscalar susceptibilities and quark condensates in three-flavor QCD, including consistently the $η$-$η'$ sector and the $U_A(1)$ anomaly. These identities are verified in the low-energy realization provided by ChPT, both in the standard $SU(3)$ framework for the octet case and combining the use of the $U(3)$ framework and the large-$N_c$ expansion of QCD to account properly for the nonet sector and anomalous contributions. The analysis is performed including finite temperature corrections as well as the calculation of $U(3)$ quark condensates and all pseudoscalar susceptibilities, which together with the full set of Ward identities, are new results of this work. Finally, the Ward identities are used to derive scaling relations for pseudoscalar masses, which explain the behavior with temperature of lattice screening masses near chiral symmetry restoration.

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