论文标题
$ | v_ {cb} | $和$ r（d^{*}）$ in $ b \ to d^{*} \ellν_\ ell $ decays in SM预测的更新
Updates on SM predictions of $|V_{cb}|$ and $R(D^{*})$ in $B\to D^{*}\ellν_\ell$ decays
论文作者
论文摘要
我们使用$ b \中的衰减分布的最新结果更新$ r（d^*）$的标准模型（sm）预测，以同时提取$ | v_ | v_ v_ {cb} | $。根据分析中使用的输入，我们定义了各种拟合场景。尽管在所有情况下，预测的$ r（d^*）$的核心价值从2017年的早期预测中降低了，但结果在不确定性中彼此一致。在此分析中，我们对$ r（d^*）$的预测与$ \ sim3σ$的世界平均水平一致。我们还预测了与$ b \ to d^*τν_τ$衰减相关的几个角度可观察结果。我们注意到，预测的$ f_l（d^*）$与2 $σ$的相应测量值一致。利用这些新结果，我们拟合了Wilson系数出现在粒子物理（BSM）的标准模型之外。为了了解SM预测的趋势，我们利用了最近发表的针对非零零反应形式的初步结果，例如Fermilab-Milc和JLQCD，并预测了$ b \ to d^**^* \ ell n中的可观察结果。
We update the standard model (SM) predictions of $R(D^*)$ using the latest results on the decay distributions in $B \to D^* \ell ν_{\ell}$ ($\ell = μ, e$) by Belle collaboration, while extracting $|V_{cb}|$ at the same time. Depending on the inputs used in the analysis, we define various fit scenarios. Although the central values of the predicted $R(D^*)$ in all the scenarios have reduced from its earlier predictions in 2017, the results are consistent with each other within the uncertainties. In this analysis, our prediction of $R(D^*)$ is consistent with the respective world average at $\sim 3σ$. We have also predicted several angular observables associated with $B \to D^* τν_τ$ decays. We note that the predicted $F_L(D^*)$ is consistent with the corresponding measurement at 2$σ$. Utilizing these new results, we fit the Wilson coefficients appearing beyond the standard model of particle physics (BSM). To see the trend of SM predictions, we have utilized the recently published preliminary results on the form-factors at non-zero recoil by the lattice groups like Fermilab-MILC and JLQCD and predicted the observables in $B \to D^* \ell ν_{\ell}$, and $B \to D^* τν_τ$ decays.
