We fit the unfolded data of $\bar{ B}^0\rightarrow D^{ *+} \ell \overline{ \nu}$ from the Belle experiment, where $\ell \equiv e, \mu$, using a method independent of heavy quark symmetry to extrapolate to zero-recoil and extract the value of $|V_{ cb}|$. This results in $|V_{ cb}| = (41.9^{ ~+2.0}_{ ~-1.9})\times 10^{ -3}$, which is robust to changes in the theoretical inputs and very consistent with the value extracted from inclusive semileptonic $B$ decays.
Categories: hep-ph