标题： 更深入地研究从$B\toπlν$提取$|V_{ub}|$的过程 显示英文标题

标题： A closer look at the extraction of $|V_{ub}|$ from $B\toπlν$

摘要： 为了提取 Cabibbo-Kobayashi-Maskawa (CKM) 矩阵元$|V_{ub}|$，我们重新分析了所有可用的输入（数据和理论）关于$B\to\pi l\nu$衰变，包括来自光锥求和规则 (LCSR) 方法的新可用形式因子输入。我们重现并比较了与重味平均组 (HFLAV) 所采用的程序的结果，同时评论了异常值对拟合的影响。在去除异常值并创建可比的数据集组后，我们在提取$|V_{ub}|$的几种场景中提到一些情况。在所有这些场景中，提取的$|V_{ub}|$值都高于 HFLAV 所得到的值。 我们基于频率学方法和贝叶斯方法得到的关于$|V_{ub}|^{exc.}$的最佳结果分别是$(3.88 \pm 0.13)\times 10^{-3}$和$(3.87 \pm 0.13)\times 10^{-3}$，它们与从包含衰变$|V_{ub}|^{inc}$提取的结果在$1~\sigma$置信区间内一致。 显示英文摘要

摘要： To extract the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $|V_{ub}|$, we have re-analyzed all the available inputs (data and theory) on the $B\to\pi l\nu$ decays including the newly available inputs on the form-factors from light cone sum rule (LCSR) approach. We have reproduced and compared the results with the procedure taken up by the Heavy Flavor Averaging Group (HFLAV), while commenting on the effect of outliers on the fits. After removing the outliers and creating a comparable group of data-sets, we mention a few scenarios in the extraction of $|V_{ub}|$. In all those scenarios, the extracted values of $|V_{ub}|$ are higher than that obtained by HFLAV. Our best results for $|V_{ub}|^{exc.}$ are $(3.88 \pm 0.13)\times 10^{-3}$ and $(3.87 \pm 0.13)\times 10^{-3}$ in frequentist and Bayesian approaches, respectively, which are consistent with that extracted from inclusive decays $|V_{ub}|^{inc}$ within $1~\sigma$ confidence interval.