| Abstract |
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We present a measurement of moments of the inclusive hadronic-mass and
-energy spectrum in semileptonic $B \to X_c \ell \nu$ decays. This study is
based on a sample of 231 million $\Upsilon(4S)\to B \overline{B}$ decays
recorded by the BABAR detector at the PEP II $e^+e^-$-storage rings. We
reconstruct the semileptonic decay by identifying a lepton in events tagged
by a fully reconstructed hadronic decay of the second B meson. in the recoil
of a fully reconstructed $B$ meson. We measure moments for different minimal
lepton momenta between 0.8 and 1.9$\,\mathrm{GeV}/c$. These are predicted in
the framework of a Heavy Quark Expansion (HQE), which allows the extraction
of the total semileptonic branching fraction, the CKM-matrix element
$|V_{cb}|$, and the quark masses $m_b$ and $m_c$, together with the dominant
non-perturbative HQE parameters occuring in the expansion up to the order
$1/m_b^3$.
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