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

2006/11/27 by K. Abe, Abe, K.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.hep-ex/0611047

openalex publication_date 2006/11/27 · openalex created_date 2017/04/07 · openalex updated_date 2026/07/28

Abstract

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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