论文标题
半衰减衰减的轻锥总和规则分析$λ_b^0 \toλ_c^+ \ ell^ - \overlineNν_\ ell $ $
Light-cone Sum Rule Analysis of Semileptonic Decays $Λ_b^0 \to Λ_c^+ \ell^- \overlineν_\ell$
论文作者
论文摘要
在这项工作中，我们分析了轻单和规则方法中$λ_b\toλ_c$的半衰减过程。为了计算$λ_b$ baryon transition矩阵元素的形式因素，我们使用了从QCD总和QCD SUM在重型夸克有效的现场理论框架中获得的$λ_b$的轻锥分布振幅。通过计算$λ_b\toλ_c$过渡矩阵元素的六个形式，$λ_b^0 \toλ_c^+ el^+ el^ - \ ely^ - overlineν_\ ell（\ ell = ell = e，〜ul = e，〜μ，〜CH）及其绝对分支的分支脱位。此外，$ r（λ_c^+）\ equiv \ equiv \ equiv {b} r（λ_b^0 \与λ_c^+τ^ - overlineν_τ）的比率我们的结果符合最新的实验结果以及其他理论计算和预测。
In this work, we analyze the semileptonic decay processes of $Λ_b \to Λ_c$ in the light-cone sum rule approach. In order to calculate the form factors of the $Λ_b$ baryon transition matrix element, we use the light-cone distribution amplitudes of $Λ_b$ obtained from the QCD sum rule in the heavy quark effective field theory framework. With the calculation of the six form factors of the $Λ_b \to Λ_c$ transition matrix element, the differential decay widths of $Λ_b^0 \to Λ_c^+ \ell^- \overlineν_\ell (\ell = e, ~μ, ~τ)$ and their absolute branching fractions are obtained. Additionally, the ratio of $R(Λ_c^+) \equiv \mathcal{B}r(Λ_b^0 \to Λ_c^+ τ^- \overlineν_τ)/\mathcal{B}r(Λ_b^0 \to Λ_c^+ μ^- \overlineν_μ)$ is also obtained in this work. Our results are in accord with the newest experimental result and other theoretical calculations and predictions.
