We update the standard model (SM) predictions of R(D*) using the latest results on the decay distributions in B → D∗lνl (l = μ, e) by Belle collaboration, while extracting |Vcb| 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 ∼ 3σ. We have also predicted several angular observables associated with B → D*τντ decays. We note that the predicted FL(D*) is consistent with the corresponding measurement at 2σ. 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 used 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 → D∗lνl, and B → D*τντ decays.

中文翻译：

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提取 |Vcb| 的更新 和 B 中 R(D*) 的 SM 预测 → D*ℓνℓ 衰减

我们通过 Belle 协作使用 B → D∗lνl (l = μ, e) 中衰减分布的最新结果更新 R(D*) 的标准模型 (SM) 预测，同时提取 |Vcb| 同时。根据分析中使用的输入，我们定义了各种拟合场景。尽管所有情景中预测的 R(D*) 的中心值都比 2017 年的早期预测有所降低，但在不确定性范围内，结果相互一致。在这个分析中，我们对 R(D*) 的预测与各自的世界平均值一致，约为 3σ。我们还预测了几个与 B → D*τντ 衰变相关的角度观测值。我们注意到预测的 FL(D*) 与 2σ 处的相应测量值一致。利用这些新结果，我们拟合出现在粒子物理标准模型 (BSM) 之外的威尔逊系数。为了查看 SM 预测的趋势，我们使用了 Fermilab-MILC 和 JLQCD 等晶格群最近发表的非零反冲形状因子的初步结果，并预测了 B → D*lνl 和 B → D*τντ 衰减。