Improved Measurement of |V_ub| with Inclusive Semileptonic B Decays

Abstract

We report a new measurement of the CKM parameter V_ub made with a sample of 9.7 million B B-bar events collected with the CLEO II detector. Using Heavy Quark theory, we combine the observed yield of leptons from semileptonic B decay in the end-point momentum interval 2.2-2.6 GeV/c with recent CLEO II data on B --> X_s gamma to find |V_ub| = (4.08 +/- 0.34 +/- 0.44 +/- 0.16 +/- 0.24) x 10^-3, where the first two uncertainties are experimental and the last two are from theory.

8 pages, 1 figure, also available here http://www.lns.cornell.edu/public/CLNS/2001/CLNS01-1767/clns01-1767.ps, submitted to Phys. Rev. Lett

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• Branching Fraction and Photon Energy Spectrum b -> s gamma

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