Measurement of Moments of the Hadronic-Mass and -Energy Spectrum in Inclusive Semileptonic $\bar{B} \to X_{c} \ell^{-} \barν$ Decays

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dc.creatorThe BABAR Collaboration
dc.creatorAubert, B.
dc.date2007-07-18
dc.date.accessioned2026-07-07T08:19:00Z
dc.date.available2026-07-07T08:19:00Z
dc.descriptionWe present a measurement of moments of the inclusive hadronic-mass and -energy spectrum in semileptonic $\bar{B} \to X_{c} \ell^{-} \barν$ decays. This study is based on a sample of 232 million $Υ(4S) \to B\bar{B}$ 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. We report preliminary results for the moments $<m_X^k>$ with $k=1,...,6$ and $<n_X^k>$ with $k=2,4,6$ and $n_X^2 = m_X^2 c^4 - 2 \tildeΛ E_X + \tildeΛ^2$, with $m_X$ the mass of the hadronic system, $E_X$ its energy, and $\tildeΛ$ a constant of $0.65 \mathrm{GeV}$, for different minimal lepton momenta between 0.8 and $1.9 \mathrm{GeV}/c$ measured in the $B$-meson rest frame. 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. We find as preliminary results $|V_{cb}| = (41.88 \pm 0.81) \cdot 10^{-3}$ and $m_b = (4.552 \pm 0.055) \mathrm{GeV}/c^2$.
dc.description21 pages, 11 postscript figures, submitted to EPS-HEP2007
dc.identifierhttps://arxiv.org/abs/0707.2670
dc.identifierhttp://arxiv.org/abs/0707.2670
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/134627
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of Moments of the Hadronic-Mass and -Energy Spectrum in Inclusive Semileptonic $\bar{B} \to X_{c} \ell^{-} \barν$ Decays
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