arXiv 0710.09782007-10-04hep-phhep-exhep-lathep-thnucl-th

激发态强子的QCD对称性

QCD symmetries in excited hadrons

L. Ya. Glozman

备注：: 10 pp, Invited talk at MENU 2007, September 10 - 14, 2007, Juelich, Germany
发表信息：: ECONFC070910:140,2007

摘要：

本文综述了激发态强子中手征和$U(1)_A$反应的最新进展。我们强调预测的手征对称性恢复方案的轴向收费和耦合戈德斯通玻色子。使用非常普遍的手征对称性参数，它表明，严格的手征恢复在一个给定的激发核子禁止其衰变到$N π$通道。我们面对这个预测与$N^*Nπ$耦合常数提取的衰变宽度，并观察到100%的相关性，这些数据与光谱宇称二重态模式。这些结果表明，最低的近似手性宇称双峰是$N(1440) - N(1535)$对。在介子部门，我们讨论的手征对称性恢复的预测仍然缺少的国家和签名的更高的对称性观察到新的$\bar p p$数据。我们的结论与精确可解的手征对称和限制模型，可以被认为是一个推广的1+1维的t Hooft模型的4维。完整的$\bar q q$介子谱表明，随着$J$的增加，手征恢复较快，而随着$n$的增加，手征恢复较慢。

英文摘要：

Recent developments for chiral and $U(1)_A$ restorations in excited hadrons are reviewed. We emphasize predictions of the chiral symmetry restoration scenario for axial charges and couplings to Goldstone bosons. Using very general chiral symmetry arguments it is shown that strict chiral restoration in a given excited nucleon forbids its decay into the $N π$ channel. We confront this prediction with the $N^*Nπ$ coupling constants extracted from the decay widths and observe a 100 % correlation of these data with the spectroscopic parity doublet patterns. These results suggest that the lowest approximate chiral parity doublet is the $N(1440) - N(1535)$ pair. In the meson sector we discuss predictions of the chiral symmetry restoration for still missing states and a signature of the higher symmetry observed in new $\bar p p$ data. We conclude with the exactly solvable chirally symmetric and confining model that can be considered as a generalization of the 1+1 dimensional 't Hooft model to 4 dimensions. Complete spectra of $\bar q q$ mesons demonstrate a fast chiral restoration with increasing $J$ and a slow one with increasing $n$.

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