中文

微扰QCD方法中的$B \to (\jpsi,\eta_c) K$衰变

高能物理 - 唯象学 2015-05-13 v3

摘要

本文在微扰QCD方法中,考虑了部分次领头阶(NLO)贡献,计算了B(\jpsi,ηc)KB \to (\jpsi, \eta_c) K衰变。我们发现:(a) 当计入已知NLO贡献的大幅增强时,NLO pQCD对分支比的预测如下:Br(B0\jpsiK0)=5.22.8+3.5×104Br(B^0 \to \jpsi K^0) = 5.2^{+3.5}_{-2.8}\times 10^{-4}Br(B+\jpsiK+)=5.62.9+3.7×104Br(B^+ \to \jpsi K^+) = 5.6^{+3.7}_{-2.9}\times 10^{-4}Br(B0ηcK0)=5.52.0+2.3×104Br(B^0 \to \eta_c K^0) = 5.5^{+2.3}_{-2.0}\times 10^{-4}Br(B+ηcK+)=5.92.1+2.5×104Br(B^+ \to \eta_c K^+) = 5.9^{+2.5}_{-2.1}\times 10^{-4},这些值比测量值大约小40%,但在2σ2-\sigma误差范围内基本与数据一致;(b) NLO pQCD对B(\jpsi,ηc)KB \to (\jpsi,\eta_c)K衰变CP破坏不对称性的预测与数据完全吻合。

关键词

引用

@article{arxiv.0901.0165,
  title  = {$B \to (\jpsi,\eta_c) K$ decays in the perturbative QCD approach},
  author = {Xin Liu and Zhi-Qing Zhang and Zhen-Jun Xiao},
  journal= {arXiv preprint arXiv:0901.0165},
  year   = {2015}
}

备注

18 pages, 3 figures, RevTex. some modifications in content,numerical results changed