德国物理学家基尔霍夫(Gustav Robert Kirchhoff，1824～1887)早在其他科学家引入“黑体”的概念以及用实验方法描绘黑体辐射曲线和建立辐射基本定律的完整公式之前，就曾开始研究物质的热特性，并最终在研究辐射传输过程中，于1859年...德国物理学家基尔霍夫(Gustav Robert Kirchhoff，1824～1887)早在其他科学家引入“黑体”的概念以及用实验方法描绘黑体辐射曲线和建立辐射基本定律的完整公式之前，就曾开始研究物质的热特性，并最终在研究辐射传输过程中，于1859年根据热平衡原理导出了关于热的转换的著名的基尔霍夫辐射定律。展开更多
We apply perturbative QCD to the radiative decays of charmonia J/ψ and χcJ into light mesons. We perform a complete numerical calculation for the quark-gluon loop diagrams involved in these processes. The calculated...We apply perturbative QCD to the radiative decays of charmonia J/ψ and χcJ into light mesons. We perform a complete numerical calculation for the quark-gluon loop diagrams involved in these processes. The calculated J/ψ decay branching ratios into p-wave mesons f2（1270） and f1（1285） fit the data well, while that of fo（980） （if treated as an ss meson） is predicted to be 1.6×10^-4, which implies that f0（1710） can not be the ss or （uu＋dd）/√2 meson. Decays of p-wave charmonia χcJ→ρ（ω;φ）γ （J = 0, 1, 2） are also studied, and the branching ratio of χc1→ργ is predicted to be 1.4×10^-5, which may be tested by CLEO-c collaboration and BESlg collaboration with future experiments.展开更多
文摘德国物理学家基尔霍夫(Gustav Robert Kirchhoff，1824～1887)早在其他科学家引入“黑体”的概念以及用实验方法描绘黑体辐射曲线和建立辐射基本定律的完整公式之前，就曾开始研究物质的热特性，并最终在研究辐射传输过程中，于1859年根据热平衡原理导出了关于热的转换的著名的基尔霍夫辐射定律。
基金Supported in part by the National Natural Science Foundation of China under Grant No 10421503, and the Key Grant Project of the Ministry of Education of China under Grant No 305001.
文摘We apply perturbative QCD to the radiative decays of charmonia J/ψ and χcJ into light mesons. We perform a complete numerical calculation for the quark-gluon loop diagrams involved in these processes. The calculated J/ψ decay branching ratios into p-wave mesons f2（1270） and f1（1285） fit the data well, while that of fo（980） （if treated as an ss meson） is predicted to be 1.6×10^-4, which implies that f0（1710） can not be the ss or （uu＋dd）/√2 meson. Decays of p-wave charmonia χcJ→ρ（ω;φ）γ （J = 0, 1, 2） are also studied, and the branching ratio of χc1→ργ is predicted to be 1.4×10^-5, which may be tested by CLEO-c collaboration and BESlg collaboration with future experiments.
