Improved Measurement of |Vub| with Inclusive Semileptonic B Decays

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

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003fuin.conf..151a&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the Seventeenth Lake Louise Winter Institute. Held 17-23 February 2002 in Lake Louise,

Physics

Scientific paper

We report a new measurement of the CKM parameter |Vub| made with a sample of 9.7 million Bbar B events collected with the CLEO II detector. An excess of 1901±122±256 leptons in the momentum interval 2.2-2.6 GeV/c is attributed to B -> Xu l bar v . To interpret this result, we use CLEO data on B → Xsγ and theoretical analyses based on heavy quark theory to determine the fraction of B -> Xu l bar v decays in our measured momentum interval. Combining these results with theoretical expressions for the B -> Xu l bar v decay rate leads to a measurement of the CKM parameter |Vub| of (4.08 ± 0.34 ± 0.44 ± 0.24 ± 0.16) × 10-3, where the first two errors are experimental and the last two are from theory.

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