Bc decays and lifetime in QCD sum rules
Bc decays and lifetime in QCD sum rules
复制标题
DOI：
10.1016/s0550-3213(00)00386-2
复制
发表时间：
2000-02
期刊：
影响因子：
--
通讯作者：
V. V. Kiselev-V.;A. Kovalsky;A. K. Likhoded
中科院分区：
文献类型：
--
作者：
V. V. Kiselev-V.;A. Kovalsky;A. K. Likhoded
在三点QCD求和规则的框架下，考虑重夸克中类库仑αs/v -修正，计算了Bc+→Bs(Bs∗)l+ν l0的半光子衰减的形因子。在反冲动量接近于零的情况下，推导了由于HQET / NRQCD的自旋对称性导致的形状因子的广义关系。利用因子分解的假设研究了非轻子衰变。结合QCD和NRQCD求和规则中对b→c衰变的分析，总结了c→s跃迁中占主导地位的独占模式，估计了bc介子寿命。
In the framework of three-point QCD sum rules, the form factors for the semileptonic decays of Bc+→Bs(Bs∗)l+νlare calculated with account for the Coulomb-like αs/v -corrections in the heavy quarkonium. The generalized relations due to the spin symmetry of HQET / NRQCD for the form factors are derived at the recoil momentum close to zero. The nonleptonic decays are studied using the assumption on the factorization. The Bc-meson lifetime is estimated by summing up the dominating exclusive modes in the c→s transition combining the current calculations with the previous analysis of b→c decays in the sum rules of QCD and NRQCD.