Further insights into the ＂ρπ puzzle

• Published in: Chinese physics C Vol. 34; no. 2; pp. 299 - 304
• Main Author: 赵强 李刚 张肇西
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.02.2010
• Subjects: amp; MD光盘; 子循环; 矢量介子; 系统调查; 联轴器
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/34/2/027

Based on a systematic investigation of J/ψ（ψ＇）→VP, where V and P stand for light vector and pseudoscalar mesons, we identify the role played by the electromagnetic （EM） transitions and intermediate meson loop transitions, which are essential ingredients for understanding the J/ψ and ψ＇ couplings to VP. We show that on the one hand, the EM transitions have relatively larger interferences in ψ＇→ρπ and K^＊^-K ＋c.c. as explicitly shown by vector meson dominance （VMD）. On the other hand, the strong decay of ψ＇ receives relatively larger destructive interferences from the intermediate meson loop transitions. By identifying these mechanisms in an overall study of J/ψ（ψ＇） → VP, we provide a coherent understanding of the so-called ＂ρπ puzzle＂.