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We present the first determination of $V_{cb}$ from inclusive $B\to X_c \ell\bar\nu_\ell$ using moments of the dilepton invariant mass, $q^2$. Thesemoments are reparametrization invariant quantities and depend on a reduced setof non-perturbative parameters. This reduced opens a new path to extract theseparameters up to $1/m_b^4$ purely from data and thereby reducing theuncertainty on $V_{cb}$. In this paper, we present our first determination of$V_{cb}$ using this method. Combining the recent measurements of $q^2$ momentsby Belle and Belle II, our default fit gives $|V_{cb}| = (41.69\pm 0.63)\cdot10^{-3}$. This results presents an important independent cross check of, and isconsistent with, the previous state-of-the-art inclusive determinations usinglepton energy and hadronic invariant mass moments.

First extraction of inclusive $V_{cb}$ from $q^2$ moments