2009

Measurement Of |V_ub| From Inclusive Charmless Semileptonic B Decays

The Belle Collaboration

Understand

We present the partial branching fraction for inclusive charmless semileptonic B decays and the corresponding value of the CKM matrix element |Vub|, using a multivariate analysis method to access ~90% of the B -> Xu l nu phase space.

This approach dramatically reduces the theoretical uncertainties from the b-quark mass and non-perturbative QCD compared to all previous inclusive measurements.
The results are based on a sample of 657 million B -Bbar pairs collected with the Belle detector.
We find that Delta BR(B -> Xu l nu; p^*B_l>1.0 GeV/c=1.963 x (1 +/- 0.088(stat.) +/- 0.081(sys.)) x 10^-3.

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This angle is also known as β \beta in the literature
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Throughout this paper, the inclusion of the charge conjugate mode decay is implied unless otherwise stated
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Then

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E. Gardi, arXiv:0806.4524 [hep-ph] (2008). (For | V u b | |V_{ub}| we set m b ( MS ¯ ) = 4.25 ± 0.05 GeV / c 2 {m_{b}^{(\overline{\rm MS})}=4.25\pm 0.05~{\rm GeV}/c^{2}} )
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