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We present a new measurement of the CKM matrix element $|V_{cb}|$ from $B^{0}\to D^{*-} \ell^+ \nu_\ell$ decays, reconstructed with the full Belle data setof $711 \, \rm fb^{-1}$ integrated luminosity. Two form factorparameterizations, originally conceived by the Caprini-Lellouch-Neubert (CLN)and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product$\mathcal{F}(1)\eta_{\rm EW}|V_{cb}|$ and the decay form factors, where$\mathcal{F}(1)$ is the normalization factor and $\eta_{\rm EW}$ is a smallelectroweak correction. In the CLN parameterization we find$\mathcal{F}(1)\eta_{\rm EW}|V_{cb}| = (35.06 \pm 0.15 \pm 0.56) \times10^{-3}$, $\rho^{2}=1.106 \pm 0.031 \pm 0.007$, $R_{1}(1)=1.229 \pm 0.028 \pm0.009$, $R_{2}(1)=0.852 \pm 0.021 \pm 0.006$. For the BGL parameterization weobtain $\mathcal{F}(1)\eta_{\rm EW}|V_{cb}|= (34.93 \pm 0.23 \pm 0.59)\times10^{-3}$, which is consistent with the World Average when correcting for$\mathcal{F}(1)\eta_{\rm EW}$. The branching fraction of $B^{0} \to D^{*-}\ell^+ \nu_\ell$ is measured to be $\mathcal{B}(B^{0}\rightarrowD^{*-}\ell^{+}\nu_{\ell}) = (4.90 \pm 0.02 \pm 0.16)\%$. We also present a newtest of lepton flavor universality violation in semileptonic $B$ decays,$\frac{{\cal B }(B^0 \to D^{*-} e^+ \nu)}{{\cal B }(B^0 \to D^{*-} \mu^+ \nu)}= 1.01 \pm 0.01 \pm 0.03~$. The errors correspond to the statistical andsystematic uncertainties respectively. This is the most precise measurement of$\mathcal{F}(1)\eta_{\rm EW}|V_{cb}|$ and form factors to date and the firstexperimental study of the BGL form factor parameterization in an experimentalmeasurement.

Measurement of the CKM Matrix Element $|V_{cb}|$ from $B^{0} \to D^{*-} \ell^+ \nu_\ell$ at Belle