Abstract
We present the partial branching fraction for inclusive charmless semileptonic decays and the corresponding value of the Cabibbo-Kobayashi-Maskawa matrix element , using a multivariate analysis method to access of the phase space. This approach dramatically reduces the theoretical uncertainties from the -quark mass and nonperturbative QCD compared to all previous inclusive measurements. The results are based on a sample of pairs collected with the Belle detector. We find that . Corresponding values of are extracted using several theoretical calculations.
- Received 3 July 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.021801
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