Determination of |Vcb| and m_b from Inclusive B -> X_c l nu and B -> X_s gamma Decays at Belle

Details Determination of |Vcb| and m_b from Inclusive B -> X_c l nu and B -> X_s gamma Decays at Belle Determination of |Vcb| and m_b from Inclusive B -> X_c l nu and B -> X_s gamma Decays at Belle

2006-11-27

arxiv.org/abs/hep-ex/0611047v2

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 6 figures, submitted to the ICHEP06 Conference, Moscow, Russia; changed |Vcb|(kinetic) error related to alpha_s, ack

Scientific paper

We present an analysis of the Belle measured moments of the lepton energy and hadronic mass spectra in B -> X_c l nu decays and the photon energy spectrum in B -> X_s gamma decays using theoretical expressions derived in the 1S and kinetic schemes. The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb, the b-quark mass and other non-perturbative parameters are extracted. In the 1S scheme analysis we find |Vcb|=(41.49 +/- 0.52(fit) +/- 0.20(tau_B)) x 10^-3 and m_b^{1S}=(4.729 +/- 0.048) GeV. In the kinetic scheme, we obtain |Vcb|=(41.93 +/- 0.65(fit) +/- 0.07(alpha_s) +/- 0.63(th)) x 10^-3 and m_b^{kin}=4.564 +/- 0.076(fit) +/- 0.003(alpha_s) GeV.

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