摘要
在微扰QCD因子化方法的框架下计算了B+→Ds(*)ρ0,B+→Ds(*)ω0和B+→Ds(*)+ρ-衰变道的分支比.通过计算发现衰变道B+→Ds(*)+ρ0,B+→D(s*)+ω0和B0→Ds(*)+ρ-的分支比在10-5量级,而B0D(s*)+ρ-衰变道的分支比最大,约为1.2×10-4.在这些衰变道中,对于末态包含两个矢量介子的衰变,径向激化的贡献是主要的,并且大于80%;而两个横向激化的贡献是被rDs(*)、rρ(ω)的幂次压低的.
The branching ratios for B→Ds^（＊）ρ^0,B＋→Dx^（＊）＋ρω^0 and B^0→Ds^（＊）ρ-decays are calculated by employing the perturbative QCD （pQCD）. It is found that the branching ratios of B→Ds^（＊）＋ρ^0,B^＋→Ds^（＊）＋ω^0 and B^0→Ds^＋ρ^- are at the order of 10^-5, and the branching ratio of B^0→Ds^（＊）＋ρ^- is the largest one, about 1.2×10^-4. For the decays involving two vector mesons in the final state, the longitudinal contributions are dominant and more than 80%, the two transverse contributions are power suppressed by rDs^（＊）,rρ（ω）.
出处
《郑州大学学报（理学版）》
CAS
北大核心
2010年第2期87-90,共4页
Journal of Zhengzhou University:Natural Science Edition
