Analysis of the coupling constants ga0ηπ0 and ga0η' π0 with light-cone QCD sum rules |
| |
引用本文: | 王志刚.Analysis of the coupling constants ga0ηπ0 and ga0η' π0 with light-cone QCD sum rules[J].中国物理 C,2010,34(1):7-15. |
| |
作者姓名: | 王志刚 |
| |
作者单位: | Department of Physics, North China Electric Power University, Baoding 071003, China |
| |
基金项目: | Supported by NSFC (10775051) and Program for New Century Excellent Talents in University (NCET-07-0282) |
| |
摘 要: | In this article, we take the point of view that the light scalar meson a0(980) is a conventional qqstate, and calculate the coupling constants ga0ηπ0 and ga0ηπ0 with the light-cone QCD sum rules. The central value of the coupling constant ga0ηπ0 is consistent with that extracted from the radiative decay φ(1020) → a0(980)γ→ηπ0γ. The central value and lower bound of the decay width Γa0→ηπ0 =127+8448 MeV are compatible with the experimental data of the total decay width Γa0(980) = (50-100) MeV from the Particle Data Group with a very model dependent estimation (the decay width can be much larger), while the upper bound is too large. We give a possible explanation for the discrepancy between the theoretical calculation and experimental data.
|
关 键 词: | 光锥QCD求和规则 偶合常数 π 衰变宽度 实验数据 辐射衰变 耦合常数 数据模型 |
收稿时间: | 2009-1-19 |
修稿时间: | 2009-2-24 |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 C》浏览原始摘要信息 |
| 点击此处可从《中国物理 C》下载免费的PDF全文 |