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We update the standard model (SM) predictions of $R(D^*)$ using the latestresults on the decay distributions in $B \to D^* \ell \nu_{\ell}$ ($\ell = \mu,e$) 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 havereduced from its earlier predictions in 2017, the results are consistent witheach other within the uncertainties. In this analysis, our prediction of$R(D^*)$ is consistent with the respective world average at $\sim 3\sigma$. Wehave also predicted several angular observables associated with $B \to D^* \tau\nu_{\tau}$ decays. We note that the predicted $F_L(D^*)$ is consistent withthe corresponding measurement at 2$\sigma$. Utilizing these new results, we fitthe Wilson coefficients appearing beyond the standard model of particle physics(BSM). To see the trend of SM predictions, we have utilized the recentlypublished preliminary results on the form-factors at non-zero recoil by thelattice groups like Fermilab-MILC and JLQCD and predicted the observables in $B\to D^* \ell \nu_{\ell}$, and $B \to D^* \tau \nu_{\tau}$ decays.

Updates on SM predictions of $|V_{cb}|$ and $R(D^{*})$ in $B\to D^{*}\ell\nu_\ell$ decays

Updates on SM predictions of $|V_{cb}|$ and $R(D^{})$ in $B\to D^{}\ell\nu_\ell$ decays