Measurement of |Vub| from Inclusive Charmless Semileptonic B Decays

P. Urquijo et al. (Belle Collaboration)
Phys. Rev. Lett. 104, 021801 – Published 13 January 2010

Abstract

We present the partial branching fraction for inclusive charmless semileptonic B decays and the corresponding value of the Cabibbo-Kobayashi-Maskawa matrix element |Vub|, using a multivariate analysis method to access 90% of the BXuν phase space. This approach dramatically reduces the theoretical uncertainties from the b-quark mass and nonperturbative QCD compared to all previous inclusive measurements. The results are based on a sample of 657×106 BB¯ pairs collected with the Belle detector. We find that ΔB(BXuν;p*B>1.0GeV/c)=1.963×(1±0.088stat±0.081syst)×103. Corresponding values of |Vub| are extracted using several theoretical calculations.

  • Figure
  • Received 3 July 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.021801

©2010 American Physical Society

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Vol. 104, Iss. 2 — 15 January 2010

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