Determination of heavy quark non-perturbative parameters from spectral moments in semileptonic B decays

Abstract

Moments of the hadronic invariant mass and of the lepton energy spectra in semileptonic B decays have been determined with the data recorded by the DELPHI detector at LEP. From measurements of the inclusive b-hadron semileptonic decays, and imposing constraints from other measurements on b- and c-quark masses, the first three moments of the lepton energy distribution and of the hadronic mass distribution, have been used to determine parameters which enter into the extraction of |V_cb| from the measurement of the inclusive b-hadron semileptonic decay width. The values obtained in the kinetic scheme are: m_b(1 GeV) = 4.591 +/- 0.062 +/- 0.039 +/- 0.005 GeV/c^2 m_c(1 GeV) = 1.170 +/- 0.093 +/- 0.055 +/- 0.005 GeV/c^2 mu_{pi}^2(1 GeV) = 0.399 +/- 0.048 +/- 0.034 +/- 0.087 GeV^2 \tildeρ_D^3 = 0.053 +/- 0.017 +/- 0.011 +/- 0.026 GeV^3, and include corrections at order 1/m_b^3. Using these results, and present measurements of the inclusive semileptonic decay partial width of b-hadrons at LEP, an accurate determination of |V_cb| is obtained: |V_cb| = 0.0421 x (1 +/- 0.014 (meas.) +/- 0.014 (fit) +/- 0.015 (th.)).

44 pages, 15 figures, Accepted by Eur. Phys. J. C

References in corpus (8)

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• Moments of semileptonic B decay distributions in the 1/m_b expansion
• Measurement of the Electron Energy Spectrum and its Moments in Inclusive B->X e nu Decays
• Determination of the Branching Fraction for B --> Xc l nu Decays and of |Vcb| from Hadronic-Mass and Lepton-Energy Moments
• Measurement of the Moments of the Hadronic Invariant Mass Distribution in Semileptonic B Decays
• Moments of the B Meson Inclusive Semileptonic Decay Rate using Neutrino Reconstruction
• Measurements of Moments of the Hadronic Mass Distribution in Semileptonic B Decays
• Measurement of |V_cb| using the semileptonic decay anti-B0d -> D*+ l- anti-nu_l

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