extracted from the $B\to D^\ast l \bar{\nu}$ data, cf. e.g. Ref.[@Amhis:2016xyh].

Recently, the published unfolded $B\to D^\ast l \bar{\nu}$ distributions by Belle [@Abdesselam:2017kjf] allowed theorists to perform their own extraction of $|V_{cb}|^{\mathrm{excl.}}$ by using slightly different parameterizations. The authors of Refs. [@Bigi:2017njr; @Grinstein:2017nlq] independently concluded that the obtained value of $|V_{cb}|^{\mathrm{excl.}}$ is parameterization dependent. The main difference is that these new authors considered the slopes and curvatures of $R_{1,2}(w)$ free parameters to be fixed from the fit with data, following a proposal by Boyd, Grinstein and Lebed (BGL) [@Boyd:1997kz]. The results obtained with both parameterizations read [@Bigi:2017njr; @Grinstein:2017nlq] $$\begin{aligned}
|V_{cb}|^{\mathrm{excl.}}_{\mathrm{CLN}} =  (38.2\pm 1.5) \times 10^{-3}\,,\qquad\qquad |V_{cb}|^{\mathrm{excl.}}_{\mathrm{BGL}} = 41.7^{+2.0}_{-2.1} \times 10^{-3}\,.\end{aligned}$$ Interestingly, the values obtained with BGL are closer to the inclusive value. [^4] While the BGL parameterization seems to be more attractive, since it does not rely on HQET relations, we still cannot conclude that one parameterization is better than another. Both fits provide an equally good description of current data. For that reason, we still need to wait for LQCD and Belle-II data at small-recoil values to finally solve the $V_{cb}$ problem.

Lepton flavor universality violation: $R_{D}$ and $R_{D^{\ast}}$
================================================================

Current status {#sec:RD-sm}
--------------

We shall now discuss the 