Model-Independent Extraction of $|V_{cb}|$ from $\bar{B}\to D^{\ast }\ell \overline{\nu }$

Abstract

We fit the unfolded data of ${\bar{B}}^0\to D^{\ast +}\ell \overline{\nu }$ 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 $|V_{cb}|=(41.9_{-1.9}^{+2.0})\times 10^{-3}$, which is robust to changes in the theoretical inputs and very consistent with the value extracted from inclusive semileptonic $B$ decays.

Comments: 8 pages, 3 figures; corrected minor typographical errors