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

## TL;DR

This paper presents a model-independent method to extract the CKM matrix element |V_{cb}| from B meson decays, providing a robust and consistent measurement with previous inclusive decay results.

## Contribution

It introduces a heavy quark symmetry-independent approach to determine |V_{cb}| from exclusive B decay data, reducing theoretical model dependence.

## Key findings

- Measured |V_{cb}| as (41.9^{+2.0}_{-1.9})×10^{-3}
- Result is consistent with inclusive decay measurements
- Method is robust against theoretical input variations

## Abstract

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.