标题： 对从$B\toπlν$提取$|V_{ub}|$的更详细观察 显示英文标题

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

摘要： 为了提取卡比博-小林-益川（CKM）矩阵元$|V_{ub}|$，我们重新分析了所有可用的关于$B\to\pi l\nu$衰变的输入（数据和理论），包括来自轻锥求和规则（LCSR）方法的新输入关于形式因子。 我们复现并比较了重夸克味平均组（HFLAV）所采用的方法，同时评论了异常值对拟合的影响。 在去除异常值并创建一个可比较的数据集后，我们在$|V_{ub}|$的提取中提到了几种情景。 在所有这些情景中，提取的$|V_{ub}|$值都高于 HFLAV 所获得的值。 我们对$|V_{ub}|^{exc.}$的最佳结果分别为$(3.88 \pm 0.13)\times 10^{-3}$和$(3.87 \pm 0.13)\times 10^{-3}$，分别来自频率学方法和贝叶斯方法，这与从包含衰变$|V_{ub}|^{inc}$在$1~\sigma$置信区间内提取的结果一致。 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.