Improved Measurement of |V_ub| with Inclusive Semileptonic B Decays

Details Improved Measurement of |V_ub| with Inclusive Semileptonic B Decays Improved Measurement of |V_ub| with Inclusive Semileptonic B Decays

2002-02-07

arxiv.org/abs/hep-ex/0202019v1

Phys.Rev.Lett.88:231803,2002

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.88.231803

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.

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