ηb decay into charmonium in association with cc pair |
| |
作者姓名: | 李柏青 李荣 何志国 |
| |
作者单位: | Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China; Department of Physics, Huzhou Teachers College, Huzhou 313000, China; Institute of High Energy Physics, Chinese Academy of Science, P.O. Box 918(4), Beijing 100049, China; Theoretical Physics Center for Sciences Facilities, CAS, Beijing 100049, China |
| |
摘 要: | We calculate the inclusive decay rates of ηb into charmonium via double c~ pairs for S- and P-wave states ηc, J/ψ and XcJ within the framework of non-relativistic QCD (NRQCD) factorization at leading order in αs. Besides calculating the contributions of the color-singlet channels ηb → cc[2s+1SL^(1)]+cc, the effects of cc pair in the color-octet configurations are also considered. We find that ηb → cc[3S1^(8)] +cc make a small contribution to Br(ηb →J/ψ(ηc)+cc). While in the ηb →XcJ +cc case, the color octet contributions are significant, for they are of the same a 5 order as the color-singlet processes. We predict Br(ηb →J/ψ(ηc)+cc) = 2.99(2.75) × 10^-5 Vc for S-wave states J/ψ and ηc, and Br(ηb → XcJ +cc) = (4.37, 3.40, 2.83) × 10^-5 (for J = 0,1, 2) for P-wave states XcJ. In the end, we also find Br(ηb → cccc) is almost saturated by ηb decay into charmonium in association with cc pair from the point of view of duality.
|
关 键 词: | 粲夸克偶素 衰变率 非相对论量子色动力学 CC 维生素C 粒子 包容性 颜色 |
收稿时间: | 2009-06-11 |
修稿时间: | 2009-06-26 |
本文献已被 CNKI 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》下载全文 |
|