Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.021801
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Funding
- MEXT
- JSPS
- Nagoya's TLPRC (Japan)
- ARC
- DIISR (Australia)
- NSFC (China)
- DST (India)
- MOEHRD
- KOSEF (Korea)
- MNiSW (Poland)
- MES
- RFAAE (Russia)
- ARRS (Slovenia)
- SNSF (Switzerland)
- NSC
- MOE (Taiwan)
- DOE (USA)
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We present the partial branching fraction for inclusive charmless semileptonic B decays and the corresponding value of the Cabibbo-Kobayashi-Maskawa matrix element vertical bar V-ub vertical bar, using a multivariate analysis method to access similar to 90% of the B -> X(u)l nu 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 X 10(6) B (B) over bar pairs collected with the Belle detector. We find that Delta B(B -> X(u)l nu; p(l)*(B) > 1.0 GeV/c) = 1.963X(1 +/- 0.088(stat) +/- 0.081(syst)) X 10(-3). Corresponding values of vertical bar V-ub vertical bar are extracted using several theoretical calculations.
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