Chiral Symmetry of Baryon and Baryon Resonances

针对重子的手性对称实现和重子激发进行了研究。主要的结果列在下面。(A)强子的QCD和规则方法：澄清了手性对称性在正负宇称重子质量差中的作用。在QCD求和规则中研究了SU(3)对称下的介子-重子耦合常数。发现F/D比与SU(6)夸克模型预测一致。(B)重子和重子共振的手性有效理论：对手性对称下的重子进行了分类，并详细考虑了镜像分配。从镜像重子候选粒子的角度研究了N*(1535)。(C)晶格QCD和阶梯QCD：有限温度下夸克-胶子混合凝聚态的猝灭晶格QCD计算表明，其行为与夸克凝聚态一致，表明具有普遍的手性恢复结构。在阶梯量子光盘中研究了瞬子诱导相互作用在标量介子谱中的作用。

Researches targeting the study of the chiral symmetry realization of the baryons and baryon excitations are performed. The main results are itemized in the following.(A) QCD sum rule approaches to the hadrons : Roles of chiral symmetry in the mass difference of the positive and negative parity baryons are clarified. The meson-baryon coupling constants under the SU(3) symmetry is also studied in the QCD sum rule. The F/D ratio is found to agree with the SU(6) quark model prediction.(B) Chiral effective theories for the baryon and baryon resonances : Baryons under chiral symmetry are classified and the mirror assignment is considered in detail. The N*(1535) is studied from the viewpoint of the mirror baryon candidate.(C) Lattice QCD and ladder QCD : Quenched lattice QCD calculation of the quark-gluon mixed condensate at finite temperature shows that the behavior coincides with the quark condensate, which indicates a universal structure of the chiral restoration. The roles of the instanton induced interaction in the scalar meson spectrum is studied in the ladder QCD.