论文标题
$ \ bar {b} _s^0 \ to ϕl^+ l^ - $ in qcd sum规则的半衰减衰减研究
Study of semileptonic decay of $\bar{B}_s^0\to ϕl^+ l^-$ in QCD sum rule
论文作者
论文摘要
在这项工作中，我们使用QCD SUM规则方法研究了$ \ bar {b} _s^0 \ to ϕl^+ l^ - $（$ l = e，μ，τ$）的半leptonic衰变。我们计算$ \ bar {b} _s^0 \ to ϕ $转换形式与此半leptonic衰减相关的要素，然后在此处降低了$ \ bar {b} _s _s^0 \ to ϕl^+ l^+ l^ - $（$ l = e，l = e，μ，τ$）的分支比率与形式相关。 $ \ bar {b} _s^0 \至ϕμ^+μ^ - $的分支比率与最近的实验数据非常吻合的结果。对于未测量的衰减模式，例如$ \ bar {b} _s^0 \ to ϕe^+ e^ - $和$ \ bar {b} _s^0 \ to ϕτ^+τ^ - $，我们给出理论预测。
In this work we study the semi-leptonic decay of $\bar{B}_s^0\to ϕl^+ l^-$($l=e, μ, τ$) with QCD sum rule method. We calculate the $\bar{B}_s^0\to ϕ$ translation form factors relevant to this semi-leptonic decay, then the branching ratios of $\bar{B}_s^0\to ϕl^+ l^-$($l=e, μ, τ$) decays are calculated with the form factors obtained here. Our result for the branching ratio of $\bar{B}_s^0\to ϕμ^+ μ^-$ agrees very well with the recent experimental data. For the unmeasured decay modes such as $\bar{B}_s^0\to ϕe^+ e^-$ and $\bar{B}_s^0\to ϕτ^+ τ^-$, we give theoretical predictions.
