Measurement of the B semileptonic branching fraction with lepton tags

CLEO Collaboration

Research output: Contribution to journalArticlepeer-review

110 Scopus citations


We have used the CLEO II detector and 2.06fb−1 of ϒ(4S) data to measure the B-meson semileptonic branching fraction. The B → Xeν momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations in events with a high-momentum lepton tag and an additional electron. We find B (B → Xeν) = (10.49 ± 0.17 ± 0.43)%, with overall systematic uncertainties less than those of untagged single-lepton measurements. We use this result to calculate the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb and to set an upper limit on the fraction of ϒ(4S) decays to final states other than BB¯.

Original languageEnglish (US)
Pages (from-to)1570-1574
Number of pages5
JournalPhysical Review Letters
Issue number10
StatePublished - Mar 4 1996

ASJC Scopus subject areas

  • General Physics and Astronomy


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