A Critical Examination to the Unitarized IJ ＝ 20 ππ Scattering Chiral Amplitude

作     者：ANG Qin XIAO Zhi-Guang ZHENG Han-Qing SONG Xing-Chang 

作者机构：Department of PhysicsPeking UniversityBeijing 100871China Department of PhysicsPeking UniversityBeijing 100871China Department of PhysicsPeking UniversityBeijing 100871China Department of PhysicsPeking UniversityBeijing 100871China 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2001年第36卷第11期

页      面：563-568页

核心收录：

学科分类：07[理学] 0704[理学-天文学] 0702[理学-物理学] 

主　　题：ππ scattering,Padé approximation,chiral perturbation theory 

摘      要：We discuss the Padé approximation to the ππ scattering amplitudes in one-loop chiral perturbation *** approximation restores unitarity and can reproduce the correct resonance poles,but the approximation violates crossing symmetry and produces spurious poles on the complex s plane and therefore plagues its predictions in some *** we find that one virtual state in the IJ = 20 channel may have physical relevance.